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Mechanical properties of a hot deformed Al-Mg_2Si in-situ composite

机译：热变形Al-Mg_2Si原位复合材料的力学性能

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摘要

An as-cast aluminum-matrix composite (AMC) with in-situ formed Mg2Si phase was subjected to high-temperature annealing, hot rolling, and hot extrusion processes. The modification effect of phosphorous (poisoning effect) was briefly taken into account. It was found that the homogenization heat treatment tremendously influences the eutectic Mg2Si phase and sharp edges of the primary particles toward slight enhancement of mechanical properties. About 44% increase in ultimate tensile strength and 335% enhancement in total elongation to failure was achieved in the extruded sample, which was ascribed to the changing of the morphology of the primary Mg2Si particles to more round or spherical shapes, the break-up of the eutectic network, closure of the casting defects, and improvement of the particle-matrix interfaces. During hot rolling at low reductions in thickness, the break-up of the eutectic structure, fragmentation of the primary particles, and development of a recrystallized microstructure resulted in enhancement of ductility. At high reductions in thickness, however, the retardation of recrystallization resulted in an increase in tensile strength and decrease in ductility with the appearance of small cracks in the heavily rolled sheet. The fracture surface appearances with the consideration of the interfacial decohesion, particle cracking by cleavage facets, and ductile fracture characterized by dimples were also discussed. The tensile toughness was calculated based on approximating the integral using the trapezoidal rule and the extruded composite was shown to have superior properties. Finally, the comparison of mechanical properties between these in-situ processed and other aluminum-based composites was made to elucidate the opportunities that the developed metal-matrix composite (MMC) can offer.
机译：原位形成Mg2Si相的铸铝基复合材料（AMC）经过高温退火，热轧和热挤压工艺。简要考虑了磷的改性作用（中毒作用）。已经发现，均质化热处理极大地影响了共晶Mg2Si相和一次颗粒的锋利边缘，从而使机械性能略有提高。挤压样品的极限抗拉强度提高了约44％，断裂总伸长率提高了约335％，这归因于原始Mg2Si颗粒的形态改变为更多的圆形或球形，共晶网络，铸件缺陷的封闭以及粒子-矩阵界面的改善。在低厚度减小的热轧过程中，低共熔组织的破裂，一次颗粒的碎裂以及再结晶组织的发展导致延展性的提高。然而，在高厚度减小的情况下，重结晶的延迟导致抗拉强度的增加和延展性的降低，并且在高轧制板中出现小裂纹。还讨论了考虑界面脱粘，断裂面开裂的颗粒破裂以及以酒窝为特征的延性断裂的断裂表面外观。使用梯形法则基于近似积分来计算拉伸韧性，并且挤出复合材料显示出优异的性能。最后，比较了这些原位加工的和其他铝基复合材料的机械性能，以阐明已开发的金属基复合材料（MMC）可以提供的机会。

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