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Yan Z.-F.,No 52 Institute Of China Ordnance Industries Group | Jin Z.-L.,Inner Mongolia University of Science and Technology | Ren H.-P.,Inner Mongolia University of Science and Technology | Liu P.-C.,Inner Mongolia University of Science and Technology | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2013

Grain orientation and grain boundary structure of the primary recrystallization annealed samples of Fe-3% Si steel produced by CSP technology simulated in laboratory conditions were investigated by XRD and EBSD technique. The results show that Goss grains are not dominant in quantity and the dominant orientation is γ texture for primary recrystallization grains. Goss grains are mainly nucleated around {111} <112> grains and they are mainly large angle grain boundaries from 25° to 55° and Σ3 grain boundaries. Source


Zhang W.,Shanghai JiaoTong University | Ding D.,Shanghai JiaoTong University | Gao P.,No 52 Institute Of China Ordnance Industries Group
Materials and Design | Year: 2016

A new method called filtration squeeze casting (FSC) was presented to fabricate high volume fraction Si particle-reinforced aluminium matrix composites (Sip/Al) for electronic packaging applications. The Sip/Al composites exhibited a CTE of ~8.70ppm/K, a TC above 119.80W/(m·K) and a density of ~2.47g/cm3 as well as a flexural strength above 163MPa. Fracture of large Si particles occurred during FSC, resulting in a decreased size of Si particles and hence an increased mechanical property and a decreased TC. The average size of Si particles of ~29μm is much smaller than that of the conventional hypereutectic Al-Si alloy but slightly larger than that of Sip/Al composites fabricated by spray deposition, resulting in balanced mechanical and physical properties. Dilution treatment decreased the amount of eutectic silicon in the matrix, leading to a considerable increase in TC and a negligible decrease in flexural strength and hardness. The flexural fracture mode is as follows. First, when the load borne by a silicon particle is beyond its fracture strength, it breaks. Then, the cracks caused by the fracture of Si particles propagate along interfaces between silicon particles and matrix Al. Finally, the link of these cracks result in the failure. © 2015 Elsevier Ltd. Source


Yin L.-L.,Baotou Vocational and Technical College | Gao P.,No 52 Institute Of China Ordnance Industries Group | Di S.-L.,No 52 Institute Of China Ordnance Industries Group
Zhuzao/Foundry | Year: 2011

The industrial silicon dust and magnesium alloy were used to prepare Mg 2Si particulate reinforced magnesium matrix composites by casting. The structures of the composites and mechanical properties were studied by using of metallographic and XRD analysis. The results show that the in-situ reaction between magnesium alloy and silica produced uniformly distributed coarse dendrite Mg 2Si phases, and after T6 heat treatment, the coarse dendrite Mg 2Si phases transformed to small particles. Finally, the composite obtained has an average tensile strength of 254 MPa, the yield strength of about 119 MPa, and the elongation rate of nearly 4%. Source


Zhang W.,Shanghai JiaoTong University | Dai X.,Shanghai JiaoTong University | Ding D.,Shanghai JiaoTong University | Gao P.,No 52 Institute Of China Ordnance Industries Group | Mingyuan G.,Shanghai JiaoTong University
Materials Science and Engineering A | Year: 2014

A monotonic loading approach called the monotonic loading-turning point approach (MLTPA) was proposed for the determination of residual stresses of fiber reinforced metal matrix composites. In MLTPA, monotonic tensile or compressive tests were carried out and the obtained stress-strain curves were used to determine the turning point stresses, according to which the matrix residual stresses were calculated using an analytical model developed in the present work. The approach was subsequently used to determine residual stresses of alumina fiber reinforced aluminum matrix composites and a good agreement was obtained between the residual stresses determined using the present approach and the cyclic loading approach. © 2014 Elsevier B.V. Source


Gao P.,No 52 Institute Of China Ordnance Industries Group | Di J.-H.,No 52 Institute Of China Ordnance Industries Group | Zhang J.-H.,No 52 Institute Of China Ordnance Industries Group | Di S.-L.,No 52 Institute Of China Ordnance Industries Group | And 3 more authors.
Zhuzao/Foundry | Year: 2010

By pre-milling and cryogenic ball milling the TiC p/Al composite particles with size about 300 nm were prepared. By stirring casting technology, and compounding the composite particles and magnesium alloy, the TiC p/AZ91 composite was prepared, and its microstructure and mechanical properties were studied. Results indicate that by cryogenic ball milling the TiC p/Al composite particles can be in-situ produced, and the composite particles can be stirred into the magnesium alloy by stir. When the volume fraction was low (3vol.%), TiC p was well-distributed in the prepared composite. When the volume fraction was high, the distribution of TiC p tended to increase along the grain boundary, and if the volume fraction reached 7vol.%, TiC p mainly distributed along the grain boundary. The results of properties testing show that the tensile strength of the composite at room temperature reached 287 MPa, elastic modulus reached 69.23GPa. At 200°C, the tensile strength reached 245 MPa, elastic modulus reached 51.32 GPa. The total creeps of the composite at 170°C with 55 MPa and at 175°C with 60 MPa for 100 h were 0.182% and 0.191%, respectively. The nail rolling function of fine particles acting on dislocations and grain boundaries leaded to the composite having well high temperature tensile and creep properties. Source

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