The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Christian Coddet - One of the best experts on this subject based on the ideXlab platform.
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compression behaviour of quasicrystal al composite with Powder Mixture driven layered microstructure prepared by selective laser melting
Optics and Laser Technology, 2020Co-Authors: Xin Lin, H L Liao, N Kang, Wei Huang, Christian CoddetAbstract:Abstract The effect of Powder Mixture on the mechanical properties of in-situ SLM processed Al-Fe-Cr quasicrystal (QC) reinforced α-Al matrix composite was investigated in this work. The results show that the microstructure is inhomogeneous with non-uniformly distributed QC particles in the melt pool from non-equilibrium solidification during SLM, which results in a special anisotropic compression behavior. In details, the microstructure consists of micron-sized columnar grains growing from the melt pool boundary to the melt pool centre, with width of 3 μm on average. Due to the higher density of QC than Al, the QC particles tend to gather at melt pool boundaries under Marangoni convection to form QC-rich regions and QC-poor regions in the melt pool, resulting in layered microstructure. Both the yield strength and the compressive strength along the building direction, with values of 501 MPa and 1159 MPa, respectively, are higher than those perpendicular one. This compressive properties anisotropy is attributed to the anisotropic crack propagation mechanisms when loaded in different directions, which results from the inhomogeneous microstructure within the melt pool.
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microstructure and strength analysis of eutectic al si alloy in situ manufactured using selective laser melting from elemental Powder Mixture
Journal of Alloys and Compounds, 2017Co-Authors: Nan Kang, Han Lin Liao, Lucas Dembinski, Pierre Coddet, Christian CoddetAbstract:Abstract In this study, dense eutectic Al-Si alloys (about 99%) were in-situ fabricated using selective laser melting (SLM) from the Powder Mixture of Al and Si under argon environment. Compared with the sample obtained from pre-alloyed Powder feedstock, a dense eutectic Al-Si alloy manufactured using SLM from Powder Mixtures needs higher input energy density. The effects of process parameters on microstructure and mechanical properties are investigated with particular emphasis on understanding the in-situ reaction during the SLM process. The microstructural analysis shows that the SLM processed samples present an ultrafine microstructure consisting of supersaturated Al-rich α-Al cellular and nano-sized Si particles. The distribution and morphology of nano-sized Si particles are significantly influenced by laser scanning speed and laser power respectively. The in-situ fabricated eutectic Al-Si alloy present a lower ultimate tensile strength and higher ductility than the sample fabricated from pre-alloyed Powder. Moreover, both tensile strength and ductility of SLM processed eutectic Al-Si alloys decrease as the laser scanning speed increases.
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effects of processing parameters on properties of selective laser melting mg 9 al Powder Mixture
Materials & Design, 2012Co-Authors: Han Lin Liao, Christian CoddetAbstract:Abstract In the present study, selective laser melting (SLM) was used to sinter a Powder Mixture of Mg–9%Al. Both densification mechanism and microstructure evolution of laser sintered Powder Mixture were established. The effect of laser processing parameter on Mg–9%Al Powder using SLM was also investigated. It can be found that a maximum relative density was 82% with preferable process parameters of v = 0.02 m/s, P = 15 W. An overlapped structure can be obtained when decreasing the laser energy density due to an incomplete melt. On the other hand, a severe particulate agglomeration appeared as the increase of the laser energy due to a balling effect. A critical scanning speed of 0.02 m/s can ensure that the particulates were well melted and not evaporated during the experiment. Moreover, the Mg and Al elements were dispersed uniformly in the samples. The microstructure and composition phase were studied through scanning electron microscopy (SEM) and X-ray elemental mapping (XRD) respectively.
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effects of processing parameters on properties of selective laser melting mg 9 al Powder Mixture
Materials & Design, 2012Co-Authors: Baicheng Zhang, Han Lin Liao, Christian CoddetAbstract:Abstract In the present study, selective laser melting (SLM) was used to sinter a Powder Mixture of Mg–9%Al. Both densification mechanism and microstructure evolution of laser sintered Powder Mixture were established. The effect of laser processing parameter on Mg–9%Al Powder using SLM was also investigated. It can be found that a maximum relative density was 82% with preferable process parameters of v = 0.02 m/s, P = 15 W. An overlapped structure can be obtained when decreasing the laser energy density due to an incomplete melt. On the other hand, a severe particulate agglomeration appeared as the increase of the laser energy due to a balling effect. A critical scanning speed of 0.02 m/s can ensure that the particulates were well melted and not evaporated during the experiment. Moreover, the Mg and Al elements were dispersed uniformly in the samples. The microstructure and composition phase were studied through scanning electron microscopy (SEM) and X-ray elemental mapping (XRD) respectively.
Han Lin Liao - One of the best experts on this subject based on the ideXlab platform.
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microstructure and strength analysis of eutectic al si alloy in situ manufactured using selective laser melting from elemental Powder Mixture
Journal of Alloys and Compounds, 2017Co-Authors: Nan Kang, Han Lin Liao, Lucas Dembinski, Pierre Coddet, Christian CoddetAbstract:Abstract In this study, dense eutectic Al-Si alloys (about 99%) were in-situ fabricated using selective laser melting (SLM) from the Powder Mixture of Al and Si under argon environment. Compared with the sample obtained from pre-alloyed Powder feedstock, a dense eutectic Al-Si alloy manufactured using SLM from Powder Mixtures needs higher input energy density. The effects of process parameters on microstructure and mechanical properties are investigated with particular emphasis on understanding the in-situ reaction during the SLM process. The microstructural analysis shows that the SLM processed samples present an ultrafine microstructure consisting of supersaturated Al-rich α-Al cellular and nano-sized Si particles. The distribution and morphology of nano-sized Si particles are significantly influenced by laser scanning speed and laser power respectively. The in-situ fabricated eutectic Al-Si alloy present a lower ultimate tensile strength and higher ductility than the sample fabricated from pre-alloyed Powder. Moreover, both tensile strength and ductility of SLM processed eutectic Al-Si alloys decrease as the laser scanning speed increases.
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effects of processing parameters on properties of selective laser melting mg 9 al Powder Mixture
Materials & Design, 2012Co-Authors: Han Lin Liao, Christian CoddetAbstract:Abstract In the present study, selective laser melting (SLM) was used to sinter a Powder Mixture of Mg–9%Al. Both densification mechanism and microstructure evolution of laser sintered Powder Mixture were established. The effect of laser processing parameter on Mg–9%Al Powder using SLM was also investigated. It can be found that a maximum relative density was 82% with preferable process parameters of v = 0.02 m/s, P = 15 W. An overlapped structure can be obtained when decreasing the laser energy density due to an incomplete melt. On the other hand, a severe particulate agglomeration appeared as the increase of the laser energy due to a balling effect. A critical scanning speed of 0.02 m/s can ensure that the particulates were well melted and not evaporated during the experiment. Moreover, the Mg and Al elements were dispersed uniformly in the samples. The microstructure and composition phase were studied through scanning electron microscopy (SEM) and X-ray elemental mapping (XRD) respectively.
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effects of processing parameters on properties of selective laser melting mg 9 al Powder Mixture
Materials & Design, 2012Co-Authors: Baicheng Zhang, Han Lin Liao, Christian CoddetAbstract:Abstract In the present study, selective laser melting (SLM) was used to sinter a Powder Mixture of Mg–9%Al. Both densification mechanism and microstructure evolution of laser sintered Powder Mixture were established. The effect of laser processing parameter on Mg–9%Al Powder using SLM was also investigated. It can be found that a maximum relative density was 82% with preferable process parameters of v = 0.02 m/s, P = 15 W. An overlapped structure can be obtained when decreasing the laser energy density due to an incomplete melt. On the other hand, a severe particulate agglomeration appeared as the increase of the laser energy due to a balling effect. A critical scanning speed of 0.02 m/s can ensure that the particulates were well melted and not evaporated during the experiment. Moreover, the Mg and Al elements were dispersed uniformly in the samples. The microstructure and composition phase were studied through scanning electron microscopy (SEM) and X-ray elemental mapping (XRD) respectively.
Hitoshi Hashimoto - One of the best experts on this subject based on the ideXlab platform.
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reaction mechanism in ti sic c Powder Mixture during pulse discharge sintering
Ceramics International, 2010Co-Authors: Zhengming Sun, Hitoshi Hashimoto, Yong Zou, Lin ChengAbstract:Abstract During pulse discharge sintering (PDS) of Ti/SiC/C Powder Mixture, combustion synthesis reactions occurred at heating rates above 20 °C/min. With an increase in heating rate, combustion synthesis occurred at higher temperatures. The essential of this combustion reaction is the liquid reaction between Ti and formed Ti 5 Si 3 . The exothermic TiC formation during PDS process promotes this liquid reaction. We have found that the combustion reactions alone did not finish the formation reactions for Ti 3 SiC 2 , and further heating following the combustion reactions is necessary for the synthesis process of Ti 3 SiC 2 .
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synthesis reactions for ti3alc2 through pulse discharge sintering ti al4c3 tic Powder Mixture
Scripta Materialia, 2006Co-Authors: Yong Zou, Zhengming Sun, Shuji Tada, Hitoshi HashimotoAbstract:A Powder Mixture of Ti/Al4C3/TiC (molar ratio: 7:1:3) is utilized for the synthesis of ternary compound Ti3AlC2 at 1250–1500 °C. Almost single-phase Ti3AlC2 is obtained after sintering at 1400 °C for 15 min. The typical microstructure of Ti3AlC2 consists of plate-like grains with size of ∼5–10 μm in width and more than 50 μm in length. The intermediate phases of AlTi3, Ti3AlC and Ti2AlC are found during the reactive sintering process and the reactions for the Ti3AlC2 phase formation are proposed.
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reaction in ti3sic2 Powder synthesis from a ti si tic Powder Mixture
Journal of Alloys and Compounds, 2004Co-Authors: Songlan Yang, Zhengming Sun, Hitoshi HashimotoAbstract:Abstract Various heat treatments in vacuum were carried out on free 2Ti–2Si–3TiC Powder Mixture, in order to disclose the reaction route in the Ti 3 SiC 2 Powder synthesis. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for the evaluation of phase identities and the morphology of the Powder after different treatments. Ti 5 Si 3 was found to be the only intermediate phase in the heating process, and the reaction between Ti 5 Si 3 , TiC and Si resulted in the formation of Ti 3 SiC 2 . The nucleation and growth of Ti 3 SiC 2 within TiC particles was observed. A reaction equation regarding the formation of Ti 3 SiC 2 was proposed based on the phase analysis.
Baicheng Zhang - One of the best experts on this subject based on the ideXlab platform.
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effects of processing parameters on properties of selective laser melting mg 9 al Powder Mixture
Materials & Design, 2012Co-Authors: Baicheng Zhang, Han Lin Liao, Christian CoddetAbstract:Abstract In the present study, selective laser melting (SLM) was used to sinter a Powder Mixture of Mg–9%Al. Both densification mechanism and microstructure evolution of laser sintered Powder Mixture were established. The effect of laser processing parameter on Mg–9%Al Powder using SLM was also investigated. It can be found that a maximum relative density was 82% with preferable process parameters of v = 0.02 m/s, P = 15 W. An overlapped structure can be obtained when decreasing the laser energy density due to an incomplete melt. On the other hand, a severe particulate agglomeration appeared as the increase of the laser energy due to a balling effect. A critical scanning speed of 0.02 m/s can ensure that the particulates were well melted and not evaporated during the experiment. Moreover, the Mg and Al elements were dispersed uniformly in the samples. The microstructure and composition phase were studied through scanning electron microscopy (SEM) and X-ray elemental mapping (XRD) respectively.
Yong Zou - One of the best experts on this subject based on the ideXlab platform.
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reaction mechanism in ti sic c Powder Mixture during pulse discharge sintering
Ceramics International, 2010Co-Authors: Zhengming Sun, Hitoshi Hashimoto, Yong Zou, Lin ChengAbstract:Abstract During pulse discharge sintering (PDS) of Ti/SiC/C Powder Mixture, combustion synthesis reactions occurred at heating rates above 20 °C/min. With an increase in heating rate, combustion synthesis occurred at higher temperatures. The essential of this combustion reaction is the liquid reaction between Ti and formed Ti 5 Si 3 . The exothermic TiC formation during PDS process promotes this liquid reaction. We have found that the combustion reactions alone did not finish the formation reactions for Ti 3 SiC 2 , and further heating following the combustion reactions is necessary for the synthesis process of Ti 3 SiC 2 .
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synthesis reactions for ti3alc2 through pulse discharge sintering ti al4c3 tic Powder Mixture
Scripta Materialia, 2006Co-Authors: Yong Zou, Zhengming Sun, Shuji Tada, Hitoshi HashimotoAbstract:A Powder Mixture of Ti/Al4C3/TiC (molar ratio: 7:1:3) is utilized for the synthesis of ternary compound Ti3AlC2 at 1250–1500 °C. Almost single-phase Ti3AlC2 is obtained after sintering at 1400 °C for 15 min. The typical microstructure of Ti3AlC2 consists of plate-like grains with size of ∼5–10 μm in width and more than 50 μm in length. The intermediate phases of AlTi3, Ti3AlC and Ti2AlC are found during the reactive sintering process and the reactions for the Ti3AlC2 phase formation are proposed.
