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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effects of eutectic silicon particles on tensile properties and fracture toughness of A356 aluminum alloys fabricated by low-pressure-casting, casting-forging, and squeeze-casting processes
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Effects of eutectic silicon particles on tensile properties and fracture toughness of A356 aluminum alloys fabricated by low-pressure-casting, casting-forging, and squeeze-casting processes

机译：共晶硅颗粒对低压铸造，铸造锻造和挤压铸造工艺制造的A356铝合金的拉伸性能和断裂韧性的影响

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摘要

Effects of eutectic silicon particles on tensile properties and fracture toughness of three A356 aluminum alloys were investigated in this study. These A356 alloys were fabricated by casting processes such as low-pressure-casting, casting-forging, and squeeze-casting, and their tensile properties and fracture toughness were analyzed in relation with microfracture mechanism study. All the cast A356 alloys contained eutectic Si particles segregated along solidification cells, and the distribution of Si particles was modified by squeeze-casting and casting-forging processes. Microfracture observation results showed that eutectic Si particles segregated along solidification cells were cracked first, but that aluminum matrix played a role in blocking crack propagation. The cast-forged alloy had the best hardness, strength, ductility, and fracture toughness because of the matrix strengthening and homogeneous distribution of eutectic Si particles due to forging process. The squeeze-cast alloy was considerably refined and densified, but this refined microstructure resulted in the reduced spacing between eutectic Si particles which worked as fracture initiation sites, thereby leading to the lower fracture toughness than the PC alloy.
机译：研究了共晶硅颗粒对三种A356铝合金的拉伸性能和断裂韧性的影响。这些A356合金是通过低压铸造，铸造锻造和挤压铸造等铸造工艺制成的，并结合微断裂机理研究分析了它们的拉伸性能和断裂韧性。所有铸造的A356合金均包含沿凝固晶胞偏析的共晶Si颗粒，并且通过挤压铸造和铸造锻造工艺改变了Si颗粒的分布。微断裂观察结果表明，沿凝固孔偏析的共晶硅颗粒首先破裂，但铝基体在阻止裂纹扩展方面发挥了作用。铸锻合金具有最佳的硬度，强度，延展性和断裂韧性，这归因于基体强化和锻造过程中共晶Si颗粒的均匀分布。挤压铸造合金被相当细化和致密化，但是这种细化的微观结构导致充当断裂起始点的共晶硅颗粒之间的间距减小，从而导致断裂韧性低于PC合金。

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