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M Y Zheng - One of the best experts on this subject based on the ideXlab platform.

  • ageing behavior of as cast sicp az91 Mg Matrix composites
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2017
    Co-Authors: X J Wang, Wei Liu, Y D Huang, M Y Zheng
    Abstract:

    Abstract SiC particles exhibited necklace-type distribution in SiCp/AZ91 Mg Matrix composites fabricated by stir casting, and thus, the SiC particles could be divided into segregated particles region and particle free region. The effects of this particle distribution on the discontinuous precipitation of Mg17Al12 phase during ageing were investigated. The high density dislocations were induced due to the sharp mismatch between the thermal expansion coefficients of SiC and AZ91 alloy. The overlapped mismatch among the segregated particles causes higher density dislocations. And as a result, the discontinuous precipitations as the ageing products started born mainly near particles, especially near segregated particles. However, few Mg17A112 precipitated in the Matrix within the particle segregation. The high-density dislocations and the numerous SiC/Mg interfaces made Mg17A112 phases much easier and earlier to precipitate in the composite. Thus, the SiCp addition reduced the peak ageing time from 38 h (for AZ91 alloy) to 28 h (for the composite). The ultimate tensile strength of the composite was enhanced by 46% after peak-ageing. SiC particles could also improve the age hardening efficiency of the composite because the high-density dislocations, the fine grain sizes and the numerous SiC/Mg interfaces cause the finer and more uniform precipitation of Mg17A112 Above all, the addition of SiC particles is effectively to improve the mechanical properties of magnesium Matrix composite materials.

  • graphene nanoplatelets induced heterogeneous bimodal structural magnesium Matrix composites with enhanced mechanical properties
    Scientific Reports, 2016
    Co-Authors: Xiaojun Wang, Manoj Gupta, Shulin Xiang, M Y Zheng
    Abstract:

    In this work, graphene nanoplatelets (GNPs) reinforced magnesium (Mg) Matrix composites were synthesised using the multi-step dispersion route. Well-dispersed but inhomogeneously distributed GNPs were obtained in the Matrix. Compared with the monolithic alloy, the nanocomposites exhibited dramatically enhanced Young's modulus, yield strength and ultimate tensile strength and relatively high plasticity, which mainly attributed to the significant heterogeneous laminated microstructure induced by the addition of GNPs. With increasing of the concentration of GNPs, mechanical properties of the composites were gradually improved. Especially, the strengthening efficiency of all the composites exceeded 100%, which was significantly higher than that of carbon nanotubes reinforced Mg Matrix composites. The grain refinement and load transfer provided by the two-dimensional and wrinkled surface structure of GNPs were the dominated strengthening mechanisms of the composites. This investigation develops a new method for incorporating GNPs in metals for fabricating high-performance composites.

  • dynamic recrystallization behavior during hot deformation and mechanical properties of 0 2 μm sicp reinforced Mg Matrix composite
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013
    Co-Authors: Kunkun Deng, X J Wang, M Y Zheng
    Abstract:

    Abstract In this paper, 0.2 μm SiCp/AZ91 composite was fabricated by stir casting technology. The influence of fine (

  • dynamic recrystallization behavior of particle reinforced Mg Matrix composites fabricated by stir casting
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2012
    Co-Authors: Xiaojun Wang, X S Hu, Kunkun Deng, K Wu, M Y Zheng
    Abstract:

    Abstract The dynamic recrystallization (DRX) of a 10 μm10% SiCp/AZ91 composite during hot compression was studied using optical microscope and transmission electron microscope. In the as-cast composite, SiC particles were segregated along grain boundaries, which was like necklaces along the grain boundaries. Thus, particles aggregated at transgranular areas while particles were almost absent at the grain interiors. During hot compression, particle deformation zones (PDZs) were formed near particles due to the mismatch between SiC particles and Mg Matrix. DRX preferentially started near particles due to “particle-stimulated nucleation (PSN)” in PDZs. Therefore, this necklace particle distribution caused initiation of DRX along the pre-existing (initial) grain boundaries. As a result, the initial grain boundaries were entirely covered by new and fine DRX grains, and necklace structure of DRX grains was formed along the grain boundaries. As DRX further proceeded, DRX extended from the intergranular areas of the initial grains to the initial grain interiors. According to the microstructure investigations and analysis, the necklace mechanism for DRX was established for Mg Matrix composites with necklace particle distribution.

  • effects of microarc oxidation surface treatment on the mechanical properties of Mg alloy and Mg Matrix composites
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2007
    Co-Authors: Yu Wang, M Y Zheng
    Abstract:

    Abstract Mechanical properties of coated AZ91 Mg alloy, Al 18 B 4 O 33 w/AZ91 and SiCw/AZ91 composites by microarc oxidation (MAO) surface treatment technique were measured and effects of MAO treatment on the mechanical properties were investigated. Tensile test shows that MAO treatment just slightly decreases ultimate tensile strength (UTS) and elongation of the Mg-based materials, while enhances their elastic modulus to some extent. But the effects of MAO treatment on the mechanical properties will be influenced by the energy parameters applied during surface treatment. The three materials coated under the same process conditions have exhibited differential surface morphology and fracture after tensile test, which indirectly indicates that the qualities of MAO coatings are also related with the substrate materials.

Yoshihito Kawamura - One of the best experts on this subject based on the ideXlab platform.

  • high temperature compressive deformation behavior of Mg97zn1y2 extruded alloy containing a long period stacking ordered lpso phase
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013
    Co-Authors: Koji Hagihara, Michiaki Yamasaki, Akihito Kinoshita, Yoshihiro Fukusumi, Yoshihito Kawamura
    Abstract:

    Abstract It has recently been found that Mg97Zn1Y2 extruded alloy containing a long-period stacking ordered (LPSO) phase has superior mechanical properties. In this study, the high-temperature deformation mechanism of the Mg97Zn1Y2 extruded alloy was examined. Grain-boundary strengthening due to the refined Mg-Matrix phase and fiber-like reinforcement due to the LPSO phase dominantly contribute to the strengthening of the alloy at room temperature, and they were confirmed to effectively act even at 200 °C. As a result, the extremely high strength of the alloy is maintained up to 200 °C, unlike other conventional Mg alloys. At 300 °C, however, the yield stress of the Mg97Zn1Y2 alloy largely decreases, and the orientation and the grain size dependence of the yield stress become weak. Increases in the operation frequency of non-basal slip in the Mg-Matrix grains weaken the grain-boundary strengthening effect. In addition, the effect of fiber-like reinforcement due to the LPSO phase is also weakened at 300 °C because the window of microstructure suitable for inducing this effect becomes significantly narrow at this temperature.

  • effect of long period stacking ordered phase on mechanical properties of Mg97zn1y2 extruded alloy
    Acta Materialia, 2010
    Co-Authors: Koji Hagihara, Michiaki Yamasaki, Yoshihito Kawamura, Akihito Kinoshita, Y Sugino, Hideyuki Yasuda, Yukichi Umakoshi
    Abstract:

    Abstract The mechanical properties of Mg97Zn1Y2 extruded alloy, composed of Mg Matrix phase and a long-period stacking ordered phase, the so-called LPSO phase, with a volume fraction of approximately 24%, were investigated using compression tests at room temperature. The microstructure was varied to a large degree by various heat treatments at high temperatures above 400 °C, and the relationship between the microstructure and mechanical properties was clarified. The plastic behavior of the Mg/LPSO two-phase alloy was compared with that of Mg99.2Zn0.2Y0.6 alloy, composed almost Mg-solid-solution phase, and the strengthening mechanisms at work in the Mg97Zn1Y2 extruded alloy are discussed. The existence of the LPSO phase strongly enhanced the refinement of Mg Matrix grains during extrusion, which led to a large increase in yield stress through the Hall–Petch relationship. In addition, the LPSO phases, which were aligned along the direction of extrusion in the Mg97Zn1Y2 extruded alloy, acted as hardening phases, being roughly coordinated with the short-fiber reinforcement mechanism.

  • plastic deformation behavior of Mg97zn1y2 extruded alloys
    Transactions of Nonferrous Metals Society of China, 2010
    Co-Authors: Koji Hagihara, Michiaki Yamasaki, Yoshihito Kawamura, Akihito Kinoshita, Y Sugino, Hiroyuki Y Yasuda, Yukichi Umakoshi
    Abstract:

    Abstract The mechanical properties of the Mg97Zn1Y2 extruded alloy containing the long-period stacking ordered phase, the so-called LPSO-phase, with a volume fraction of 24%-25%, were examined by compression tests and cyclic tension-compression deformation tests. The plastic behavior of the extruded alloys with compositions of Mg99.2Zn0.2Y0.6 and Mg89Zn4Y7 (molar fraction, %), which were almost the same compositions of Mg Matrix phase and LPSO phase in Mg97Zn1Y2 Mg/LPSO two-phase alloy, respectively, were also prepared. By comparing their mechanical properties, the strengthening mechanisms operating in the Mg97Zn1Y2 extruded alloy were discussed. Existence of the LPSO-phase strongly enhanced the refinement of Mg Matrix grain size during extrusion, which led to a large increment of the strength of alloy. In addition, the LPSO-phases, which were aligned along the extrusion direction in Mg97Zn1Y2 extruded alloy, acted as hardening phases, just like reinforced fibers.

  • formation of 14h long period stacking ordered structure and profuse stacking faults in Mg zn gd alloys during isothermal aging at high temperature
    Acta Materialia, 2007
    Co-Authors: Michiaki Yamasaki, Minami Sasaki, Masahiko Nishijima, Kenji Hiraga, Yoshihito Kawamura
    Abstract:

    Abstract This paper proposes a time–temperature-transformation diagram of an Mg–Zn–Gd alloy. An Mg 97 Zn 1 Gd 2 (at.%) alloy shows different precipitation sequences at low, medium and high temperatures. Low-temperature aging at 623 K led to strengthening of the Mg–Zn–Gd alloy, owing to the formation of profuse stacking faults and 14H long period stacking ordered structure from the supersaturated α-Mg Matrix, respectively.

  • elevated temperature Mg97y2cu1 alloy with long period ordered structure
    Scripta Materialia, 2006
    Co-Authors: Yoshihito Kawamura, Takayuki Kasahara, Shogo Izumi, Michiaki Yamasaki
    Abstract:

    Mg97Y2Cu1 (at.%) cast alloy has an 18R-type long period ordered (LPO) structure that forms coherently with the α-Mg Matrix during casting. Hot working improved the mechanical properties of the LPO Mg97Y2Cu1 cast alloy. Hot-extruded LPO Mg97Y2 Cu1 alloy exhibited high tensile mechanical properties. The yield strength, tensile strength and elongation were 297 MPa, 377 MPa and 8.1%, respectively, at ambient temperature, and 273 MPa, 344 MPa and 16.3%, respectively, at 473 K.

Michiaki Yamasaki - One of the best experts on this subject based on the ideXlab platform.

  • high temperature compressive deformation behavior of Mg97zn1y2 extruded alloy containing a long period stacking ordered lpso phase
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013
    Co-Authors: Koji Hagihara, Michiaki Yamasaki, Akihito Kinoshita, Yoshihiro Fukusumi, Yoshihito Kawamura
    Abstract:

    Abstract It has recently been found that Mg97Zn1Y2 extruded alloy containing a long-period stacking ordered (LPSO) phase has superior mechanical properties. In this study, the high-temperature deformation mechanism of the Mg97Zn1Y2 extruded alloy was examined. Grain-boundary strengthening due to the refined Mg-Matrix phase and fiber-like reinforcement due to the LPSO phase dominantly contribute to the strengthening of the alloy at room temperature, and they were confirmed to effectively act even at 200 °C. As a result, the extremely high strength of the alloy is maintained up to 200 °C, unlike other conventional Mg alloys. At 300 °C, however, the yield stress of the Mg97Zn1Y2 alloy largely decreases, and the orientation and the grain size dependence of the yield stress become weak. Increases in the operation frequency of non-basal slip in the Mg-Matrix grains weaken the grain-boundary strengthening effect. In addition, the effect of fiber-like reinforcement due to the LPSO phase is also weakened at 300 °C because the window of microstructure suitable for inducing this effect becomes significantly narrow at this temperature.

  • effect of long period stacking ordered phase on mechanical properties of Mg97zn1y2 extruded alloy
    Acta Materialia, 2010
    Co-Authors: Koji Hagihara, Michiaki Yamasaki, Yoshihito Kawamura, Akihito Kinoshita, Y Sugino, Hideyuki Yasuda, Yukichi Umakoshi
    Abstract:

    Abstract The mechanical properties of Mg97Zn1Y2 extruded alloy, composed of Mg Matrix phase and a long-period stacking ordered phase, the so-called LPSO phase, with a volume fraction of approximately 24%, were investigated using compression tests at room temperature. The microstructure was varied to a large degree by various heat treatments at high temperatures above 400 °C, and the relationship between the microstructure and mechanical properties was clarified. The plastic behavior of the Mg/LPSO two-phase alloy was compared with that of Mg99.2Zn0.2Y0.6 alloy, composed almost Mg-solid-solution phase, and the strengthening mechanisms at work in the Mg97Zn1Y2 extruded alloy are discussed. The existence of the LPSO phase strongly enhanced the refinement of Mg Matrix grains during extrusion, which led to a large increase in yield stress through the Hall–Petch relationship. In addition, the LPSO phases, which were aligned along the direction of extrusion in the Mg97Zn1Y2 extruded alloy, acted as hardening phases, being roughly coordinated with the short-fiber reinforcement mechanism.

  • plastic deformation behavior of Mg97zn1y2 extruded alloys
    Transactions of Nonferrous Metals Society of China, 2010
    Co-Authors: Koji Hagihara, Michiaki Yamasaki, Yoshihito Kawamura, Akihito Kinoshita, Y Sugino, Hiroyuki Y Yasuda, Yukichi Umakoshi
    Abstract:

    Abstract The mechanical properties of the Mg97Zn1Y2 extruded alloy containing the long-period stacking ordered phase, the so-called LPSO-phase, with a volume fraction of 24%-25%, were examined by compression tests and cyclic tension-compression deformation tests. The plastic behavior of the extruded alloys with compositions of Mg99.2Zn0.2Y0.6 and Mg89Zn4Y7 (molar fraction, %), which were almost the same compositions of Mg Matrix phase and LPSO phase in Mg97Zn1Y2 Mg/LPSO two-phase alloy, respectively, were also prepared. By comparing their mechanical properties, the strengthening mechanisms operating in the Mg97Zn1Y2 extruded alloy were discussed. Existence of the LPSO-phase strongly enhanced the refinement of Mg Matrix grain size during extrusion, which led to a large increment of the strength of alloy. In addition, the LPSO-phases, which were aligned along the extrusion direction in Mg97Zn1Y2 extruded alloy, acted as hardening phases, just like reinforced fibers.

  • formation of 14h long period stacking ordered structure and profuse stacking faults in Mg zn gd alloys during isothermal aging at high temperature
    Acta Materialia, 2007
    Co-Authors: Michiaki Yamasaki, Minami Sasaki, Masahiko Nishijima, Kenji Hiraga, Yoshihito Kawamura
    Abstract:

    Abstract This paper proposes a time–temperature-transformation diagram of an Mg–Zn–Gd alloy. An Mg 97 Zn 1 Gd 2 (at.%) alloy shows different precipitation sequences at low, medium and high temperatures. Low-temperature aging at 623 K led to strengthening of the Mg–Zn–Gd alloy, owing to the formation of profuse stacking faults and 14H long period stacking ordered structure from the supersaturated α-Mg Matrix, respectively.

  • elevated temperature Mg97y2cu1 alloy with long period ordered structure
    Scripta Materialia, 2006
    Co-Authors: Yoshihito Kawamura, Takayuki Kasahara, Shogo Izumi, Michiaki Yamasaki
    Abstract:

    Mg97Y2Cu1 (at.%) cast alloy has an 18R-type long period ordered (LPO) structure that forms coherently with the α-Mg Matrix during casting. Hot working improved the mechanical properties of the LPO Mg97Y2Cu1 cast alloy. Hot-extruded LPO Mg97Y2 Cu1 alloy exhibited high tensile mechanical properties. The yield strength, tensile strength and elongation were 297 MPa, 377 MPa and 8.1%, respectively, at ambient temperature, and 273 MPa, 344 MPa and 16.3%, respectively, at 473 K.

Xiaojun Wang - One of the best experts on this subject based on the ideXlab platform.

  • graphene nanoplatelets reinforced Mg Matrix composite with enhanced mechanical properties by structure construction
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2018
    Co-Authors: Linglong Meng, Xiaojun Wang, Hailong Shi, Chunlei Zhang, Yeyang Xiang, Nanjia Liu
    Abstract:

    Abstract Balanced strength and toughness are essential elements for application of metal Matrix composites and can be realized through structure construction. In this work, graphene nanoplatelets (GNPs) reinforced magnesium laminated composites were fabricated. The composites with 0.25 vol% and 0.75 vol% GNPs exhibit tensile strength of 160 MPa and 179 MPa, respectively (136 MPa for pure Mg). Homogeneously dispersed GNPs promotes the load transfer capacity and constrains the transformation of Mg foils to monolithic materials. The induced laminated structure prohibits the dislocation motion and strengthens the composites. The prolonged crack pathway by laminated structure also maintains the elongation to an appreciable level.

  • Microstructure and mechanical properties of bio-inspired Cf/Ti/Mg laminated composites
    KeAi, 2018
    Co-Authors: Zhenming Sun, Chunlei Zhang, Xiaojun Wang
    Abstract:

    Inspired by an old fish skin structure, the Cf/Ti/Mg laminated composites were fabricated by squeeze casting technology. No porous or voids were found in final composite, and carbon fiber was uniformly dispersed in Mg Matrix. Furthermore, the addition of net-shaped Ti adsorbed Al element and facilitated the nucleation of Mg17Al12 nearby Ti. The reaction product Al4C3 was found at the Cf and AZ91 interface. Mechanical tests indicate that the introduction of Ti could greatly improve the toughness of Cf/Mg composites. Keywords: Magnesium Matrix composites, Carbon fiber, Laminated composite

  • graphene nanoplatelets induced heterogeneous bimodal structural magnesium Matrix composites with enhanced mechanical properties
    Scientific Reports, 2016
    Co-Authors: Xiaojun Wang, Manoj Gupta, Shulin Xiang, M Y Zheng
    Abstract:

    In this work, graphene nanoplatelets (GNPs) reinforced magnesium (Mg) Matrix composites were synthesised using the multi-step dispersion route. Well-dispersed but inhomogeneously distributed GNPs were obtained in the Matrix. Compared with the monolithic alloy, the nanocomposites exhibited dramatically enhanced Young's modulus, yield strength and ultimate tensile strength and relatively high plasticity, which mainly attributed to the significant heterogeneous laminated microstructure induced by the addition of GNPs. With increasing of the concentration of GNPs, mechanical properties of the composites were gradually improved. Especially, the strengthening efficiency of all the composites exceeded 100%, which was significantly higher than that of carbon nanotubes reinforced Mg Matrix composites. The grain refinement and load transfer provided by the two-dimensional and wrinkled surface structure of GNPs were the dominated strengthening mechanisms of the composites. This investigation develops a new method for incorporating GNPs in metals for fabricating high-performance composites.

  • fabrication microstructure and mechanical properties of Mg Matrix composites reinforced by high volume fraction of sphere tc4 particles
    Journal of Magnesium and Alloys, 2016
    Co-Authors: Chunlei Zhang, Xiaojun Wang, Xiaoming Wang
    Abstract:

    Abstract A novel liquid settling method was investigated and applied to fabricate TC4 spherical particle reinforced AZ91 alloy Matrix composites. This method was called liquid state settling technique in which TC4 particles would settle down under the force of gravity. High volume fraction (50%) particle reinforced AZ91 composites could be easily obtained via this novel method. This is difficult to achieve for other traditional liquid fabrication methods. In addition, there was a good dispersion of TC4 particles in the AZ91 Matrix and no clusters were found, which indicate that this method was feasible. Interfacial reaction occurred and the reaction product was confirmed to be Al2Ti. Three kinds of pre-dispersion technologies were used before the settling process and different interfacial microstructures were found. Theoretical calculation and experimental results both indicated that the interfacial product which was embedded in the Matrix strengthened the composites and improved the tensile strength.

  • high temperature damping behavior of as deformed Mg Matrix influenced by micron and submicron sicp
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2015
    Co-Authors: Kunkun Deng, Xiaojun Wang, Kaibo Nie, Jianfeng Fan
    Abstract:

    Abstract In this paper, the high temperature damping behavior of as-deformed micron and submicron SiCp/AZ91 composite was investigated as compared with monolithic AZ91 alloy. The damping mechanism was analyzed and verified with the help of microstructure observation at elevated temperatures. Results show that the damping capacity of AZ91 alloy and its composites intensively depend on the measuring temperature. The micron SiCp/AZ91 composite exhibits the best damping capacity at 25–300 °C, while the AZ91 alloy shows better damping capacity as the temperature exceeds 300 °C. Two peaks are found in the damping-temperature curves. The one occurring at ~150 °C is thought of as a grain boundary peak, while the second one (existing at 300–350 °C) is recognized as a recrystallization peak. Activation energy H of the first peak is calculated. It is found that 10 vol% micron SiCp lowers the H value slightly, while only 1 vol% submicron SiCp can improve the H value obviously and the reasons are analyzed. Stabilized microstructure caused by the pinning effect of submicron SiCp dense zones and micron SiCp is thought to be responsible for the lower Q −1 value of the second peak in AZ91 alloy.

Liming Peng - One of the best experts on this subject based on the ideXlab platform.

  • formation of lamellar phase with 18r type lpso structure in an as cast Mg96gd3zn1 at alloy
    Materials Letters, 2016
    Co-Authors: Liming Peng, Juan Chen, Xiaoqin Zeng, Wenjiang Ding
    Abstract:

    Abstract A lamellar Mg 10 GdZn phase was observed near the secondary eutectic β-phase ((Mg,Zn) 3 Gd) in an as-cast Mg–Gd–Zn alloy. It shows that the Mg 10 GdZn phase exhibits a 18R-type long period stacking ordered (LPSO) structure, while the lamellae within the α-Mg Matrix exhibits a 14H-type LPSO structure. Moreover, it reveals that the hardness and elastic modulus of Mg 10 GdZn phase are much higher than those of the α-Mg by nano-mechanical measurements.

  • formation of 14h type long period stacking ordered structure in the as cast and solid solution treated Mg gd zn zr alloys
    Journal of Materials Research, 2009
    Co-Authors: Wenjiang Ding, X Q Zeng, Liming Peng, Guangyin Yuan, Dong Liang Lin
    Abstract:

    The coherent fine lamellae consisting of the 2H-Mg and the 14H-type long period stacking ordered (LPSO) structure within α′-Mg Matrix have been first observed in an as-cast Mg96.32Gd2.5Zn1Zr0.18 alloy. During subsequent solid solution heat treatment at 698–813 K, in addition to the lamellae within Matrix, a novel lamellar X phase (Mg-8.37±1.0Zn-11.32±1.0Gd, at.%) with the 14H-type LPSO structure was transformed from the dendritical β phase, and a corresponding time-temperature-transformation (TTT) diagram was established. The 14H-type LPSO structure existing in Mg-Gd-Zn-;Zr alloys derives from two variant means: the formation of LPSO structure within α′-Mg Matrix and the transformation of the dendritical β phase to a lamellar X phase with the LPSO structure. The alloy solid solution treated at 773 K for 35 h exhibits higher tensile strength and better elongation than the nonheated alloy because of the lamellar X phase with the 14H-type LPSO structure and the 14H-type LPSO structure within Matrix.

  • formation of a lamellar 14h type long period stacking ordered structure in an as cast Mg gd zn zr alloy
    Journal of Materials Science, 2009
    Co-Authors: Y J Wu, X Q Zeng, Liming Peng, W J Ding
    Abstract:

    A novel as-cast Mg96.82Gd2Zn1Zr0.18 alloy was produced by conventional ingot metallurgy. By scanning electron microscope and transmission electron microscope observations, its as-cast microstructure is mainly composed of the α′-Mg solid solution, the coherent fine-lamellae and the eutectic. The β-phase ((Mg,Zn)3Gd) as the second phase in eutectic has a face-center cubic structure. While, the coherent lamellae consist of the 2H–Mg and the 14H-type long period stacking ordered (LPSO) structure. At present, the lamellar 14H-type LPSO structure has first been observed within α′-Mg Matrix in the as-cast Mg–Gd–Zn–Zr alloys. It can be concluded that the lamellar 14H-type LPSO structure within α′-Mg Matrix is a special structure obviously different from α-Mg Matrix (2H-type structure) in structure, composition, and formation condition.