The Experts below are selected from a list of 142434 Experts worldwide ranked by ideXlab platform
Qiang Zhang - One of the best experts on this subject based on the ideXlab platform.
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MechanicAl properties of Al Matrix composite reinforced with diamond particles with W coatings prepared by the magnetron sputtering method
Journal of Alloys and Compounds, 2018Co-Authors: Guoqin Chen, Wenshu Yang, Ling Xin, Pingping Wang, Shufeng Liu, Jing Qiao, Qiang ZhangAbstract:Abstract In the present work, the effect of W coatings prepared by the magnetron sputtering method on the mechanicAl performance of the Al Matrix composites reinforced with diamond particles (Diamond/Al) has been explored. Since no debonding was observed between the diamond and the Al Matrix in the composites with 45 nm and thicker W coatings while serious debonding was found in the composite without W coating, the interfaciAl bonding between the diamond particles (All the {100} and {111} facets) and the Al Matrix has been improved. Further TEM observation indicated that the W coating has been well bonded with the diamond particle and the Al Matrix, and no interfaciAl reaction product has been found. Furthermore, the fracture behaviors of the Diamond/Al composites were Also affected by the W coatings. Compared to that of the Diamond/Al composite without W coating, the bending strength and the displacement of the bending failure of the Diamond/Al composites with 45 nm W coating have been improved 24% (from 245 to 304 MPa) and 120% (from 0.28 to 0.62 mm), respectively. Moreover, the summative results from the literatures and the present work indicate that the Diamond/Al composites have higher strength usuAlly demonstrates higher thermAl conductivity, which might be related to the interfaciAl performance of the composites.
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Damping capacity of the Al Matrix composite reinforced with SiC particle and TiNi fiber
Science and Engineering of Composite Materials, 2016Co-Authors: Qiang Zhang, Gou HuasongAbstract:AbstractImitating the structure of steel-reinforced concrete, a composite coupling good damping capacity and mechanicAl property was fabricated by pressure infiltration progress. The Aluminum (Al) Matrix composite was hybrid reinforced by 20% volume fraction of SiC particle (SiCp) and 20% volume fraction of TiNi fiber (TiNif). The damping capacity of the composite in the temperature range from 30°C to 290°C was studied using a dynamic mechanicAl anAlyzer (DMA). Due to the B19′→B2 reverse martensitic transformation in TiNif, a damping peak showed up in the heating process. Furthermore, both the hysteretic effect of the martensite/variants interfaces in TiNif and the weak bonding interface between SiCp and TiNif were attributed to the high damping capacity of the composite. After tension deformation, a compressive stress was formed in the composite in the heating process. With the help of compressive stress, the vAlue of the damping peak was much higher than before, since the movement of dislocation in the Al Matrix was easier.
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Decomposition of ZrW2O8 in Al Matrix and the influence of heat treatment on ZrW2O8/Al–Si thermAl expansion
Scripta Materialia, 2015Co-Authors: Chang Zhou, Qiang Zhang, Risheng PeiAbstract:Fully dense 64 vol.% ZrW2O8/Al–Si was fabricated by squeeze-casting technology. The decomposition of ZrW2O8 in the Al Matrix was studied based on heat-treatment results. The decomposition temperature in the Al Matrix is around 410 °C—far below the vAlue for decomposition in air. A large amount of the high-pressure phase, γ-ZrW2O8, was formed due to the large stress mismatch between ZrW2O8 and Al–Si Matrix. Low heat-treatment temperatures and suitable holding times can effectively limit the amount of γ-ZrW2O8 that forms as well as stopping the decomposition of ZrW2O8.
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Microstructure of multilayer interface in an Al Matrix composite reinforced by TiNi fiber.
Micron (Oxford England : 1993), 2014Co-Authors: Qiang Zhang, Pengchao Kang, Yan LiuAbstract:Abstract A multilayer interface was formed in the Al Matrix composite which was reinforced by 30% volume fraction of TiNi fiber. The composite was fabricated by pressure infiltration process and the interface between the TiNi fiber and Al Matrix was investigated by transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). When the TiNi fiber was pre-oxidized in the air at 773 K for 1 h, three layers have been found and characterized in the interface: TiNi–B2 layer near the TiNi fiber, Ti–Al compound layer with Ti and granular TiO2 near the Al Matrix, and Ti–Ni compound layer between TiNi–B2 and Ti–Al compound layers. The effect of the multilayer interface on the mechanicAl properties of the composite was Also discussed. The result showed that the uniaxiAl tensile strength of the composite at room temperature was 318 MPa, which was very close to the theoreticAl cAlculation vAlue of 326 MPa. Moreover, the composite with good ductility exhibited a typicAl ductile-fracture pattern.
Yuyuan Zhao - One of the best experts on this subject based on the ideXlab platform.
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Al Matrix syntactic foam fabricated with bimodAl ceramic microspheres
Materials & Design, 2009Co-Authors: X. F. Tao, Liping Zhang, Yuyuan ZhaoAbstract:The energy absorption capability of cellular solids is determined by their plateau strength and onset strain of densification, which in turn are dependent upon their porosity. MetAl Matrix syntactic foams fabricated with ceramic microspheres of a single size range have a nearly fixed porosity and thus have a limited variability in energy absorption. This paper fabricates Al Matrix syntactic foams with monomodAl or bimodAl ceramic microspheres and compares their mechanicAl properties. The syntactic foams with bimodAl ceramic microsphere have up to 10% higher porosity, which leads to 8% higher onset strain of densification. The bimodAl foams have the advantages of a flat deformation regime, high plateau stress and good ductility. They are potentiAlly excellent choice for energy absorption applications.
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Indentation Tests on Al Matrix Syntactic Foams
IUTAM Symposium on Mechanical Properties of Cellular Materials, 2009Co-Authors: X. F. Tao, Graham Schleyer, Yuyuan ZhaoAbstract:This paper investigates mechanicAl response of Al Matrix syntactic foams manufactured by pressure infiltration casting under indentation test. Syntactic foams with ceramic microspheres of three different particle sizes and inner structures were manufactured and tested. Because the hollow microspheres are stronger than the porous ones, the syntactic foam with hollow microspheres has a higher compressive strength than that of the foam with porous microspheres. As a result, the former has a higher indentation load than the latter at any fixed displacement. However, the latter is more ductile than the former. The indentation load is increased significantly when a disc spreader is used. A combination of weak foam and a thick disc may give rise to an optimum indentation resistance.
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Compressive behavior of Al Matrix syntactic foams toughened with Al particles
Scripta Materialia, 2009Co-Authors: X. F. Tao, Yuyuan ZhaoAbstract:Al Matrix syntactic foams with additionAl Al particles embedded were fabricated by the pressure infiltration method. Their compressive behavior was studied and compared with that of the plain syntactic foams. With the introduction of Al particles, the ductility of the syntactic foams is significantly increased and the compressive strength increases by up to 30%. As a consequence of the increased ductility and plateau strength, the specific energy absorption capacity is increased by up to 80%, reaching 50.6 kJ kg−1.
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Compressive Response of Al Matrix Syntactic Foam Manufactured by Liquid Sintering
2008Co-Authors: X. Tao, L. Zhang, Yuyuan ZhaoAbstract:Al Matrix syntactic foams, with ceramic microspheres embedded in an Al 6082 Alloy Matrix, were fabricated by a liquid sintering process. The densities of the as-fabricated foams increased from 1.54 to 1.87 g/cm 3 with increasing volume fraction of Al from 0.4 to 0.7. The mechanicAl properties of the as-fabricated foams can be adjusted by changing volume fraction of the Al Matrix. UniaxiAl compression tests conducted on these foams showed that the collapse strengths increased from 34.6 to 70 MPa when the volume fraction of Al increased from 0.4 to 0.7. The higher the density the foam has, the less brittle fracture was displayed. A considerable amount of void was found to remain in the Al Matrix after the sintering was completed. The void and the oxide in the Al Matrix are believed to cause the brittle fracture of the foam in compression.
E Shtessel - One of the best experts on this subject based on the ideXlab platform.
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fabrication of Al Matrix in situ composites via self propagating synthesis
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 1994Co-Authors: I Gotman, Michael J Koczak, E ShtesselAbstract:Abstract Al Matrix composite materiAls with 30 vol.% TiC, TiB2 and TiC + TiB2 ceramic reinforcements were processed in situ via self-propagating high temperature synthesis (SHS) followed by high pressure consolidation to full density. Non-steady-state oscillatory motion of the combustion wave was observed during the SHS processing, resulting in a typicAl layered structure of the reaction products. The microstructure and phase composition of the materiAls obtained were studied using X-ray diffraction, opticAl microscopy and scanning (SEM) and transmission (TEM) electron microscopy. Very-fine-scAle ceramic particles ranging from tens of nanometers up to 1–2 μm were obtained in the Al Matrix. MicrostructurAl anAlysis of the reaction products showed that the TiB2/Al and (TiB2 + TiC)/Al composites contained the Al3Ti phase, indicating that full conversion of Ti had not been achieved. In the TiC/Al composite a certain amount of Al4C3 was detected. High room and elevated temperature mechanicAl properties (yield stress, microhardness) were obtained in the high-pressure-consolidated SHS-processed TiC/Al and TiB2/Al composites, comparable with the best rapidly solidified Al-base Alloys. These high properties were attributed to the high density of the nanoscAle ceramic particles and Matrix grain refinement.
X. F. Tao - One of the best experts on this subject based on the ideXlab platform.
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Al Matrix syntactic foam fabricated with bimodAl ceramic microspheres
Materials & Design, 2009Co-Authors: X. F. Tao, Liping Zhang, Yuyuan ZhaoAbstract:The energy absorption capability of cellular solids is determined by their plateau strength and onset strain of densification, which in turn are dependent upon their porosity. MetAl Matrix syntactic foams fabricated with ceramic microspheres of a single size range have a nearly fixed porosity and thus have a limited variability in energy absorption. This paper fabricates Al Matrix syntactic foams with monomodAl or bimodAl ceramic microspheres and compares their mechanicAl properties. The syntactic foams with bimodAl ceramic microsphere have up to 10% higher porosity, which leads to 8% higher onset strain of densification. The bimodAl foams have the advantages of a flat deformation regime, high plateau stress and good ductility. They are potentiAlly excellent choice for energy absorption applications.
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Indentation Tests on Al Matrix Syntactic Foams
IUTAM Symposium on Mechanical Properties of Cellular Materials, 2009Co-Authors: X. F. Tao, Graham Schleyer, Yuyuan ZhaoAbstract:This paper investigates mechanicAl response of Al Matrix syntactic foams manufactured by pressure infiltration casting under indentation test. Syntactic foams with ceramic microspheres of three different particle sizes and inner structures were manufactured and tested. Because the hollow microspheres are stronger than the porous ones, the syntactic foam with hollow microspheres has a higher compressive strength than that of the foam with porous microspheres. As a result, the former has a higher indentation load than the latter at any fixed displacement. However, the latter is more ductile than the former. The indentation load is increased significantly when a disc spreader is used. A combination of weak foam and a thick disc may give rise to an optimum indentation resistance.
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Compressive behavior of Al Matrix syntactic foams toughened with Al particles
Scripta Materialia, 2009Co-Authors: X. F. Tao, Yuyuan ZhaoAbstract:Al Matrix syntactic foams with additionAl Al particles embedded were fabricated by the pressure infiltration method. Their compressive behavior was studied and compared with that of the plain syntactic foams. With the introduction of Al particles, the ductility of the syntactic foams is significantly increased and the compressive strength increases by up to 30%. As a consequence of the increased ductility and plateau strength, the specific energy absorption capacity is increased by up to 80%, reaching 50.6 kJ kg−1.
Yan Liu - One of the best experts on this subject based on the ideXlab platform.
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Microstructure of multilayer interface in an Al Matrix composite reinforced by TiNi fiber.
Micron (Oxford England : 1993), 2014Co-Authors: Qiang Zhang, Pengchao Kang, Yan LiuAbstract:Abstract A multilayer interface was formed in the Al Matrix composite which was reinforced by 30% volume fraction of TiNi fiber. The composite was fabricated by pressure infiltration process and the interface between the TiNi fiber and Al Matrix was investigated by transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). When the TiNi fiber was pre-oxidized in the air at 773 K for 1 h, three layers have been found and characterized in the interface: TiNi–B2 layer near the TiNi fiber, Ti–Al compound layer with Ti and granular TiO2 near the Al Matrix, and Ti–Ni compound layer between TiNi–B2 and Ti–Al compound layers. The effect of the multilayer interface on the mechanicAl properties of the composite was Also discussed. The result showed that the uniaxiAl tensile strength of the composite at room temperature was 318 MPa, which was very close to the theoreticAl cAlculation vAlue of 326 MPa. Moreover, the composite with good ductility exhibited a typicAl ductile-fracture pattern.
