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采用铜模喷铸法制备出直径为3mm的原位Mg晶态相增强块状Mg70Cu17Dy13非晶基复合材料,对Mg-Cu-Dy类合金的力学性能和变形行为进行研究。结果表明,Mg70Cu17Dy13非晶基复合材料受压时产生加工硬化并获得最大抗压强度为702.38MPa和塑性变形率为0.81%。这缘于其中Mg相有效的承载能力、塑性变形能力及Mg相对剪切带及裂纹扩展的有效抑制作用,可从其剪切变形、断裂方式和断裂面上密集的熔滴及凸凹不平得到证实。
The Mg-Cu-Dy-based amorphous Mg70Cu17Dy13 matrix composites reinforced by in-situ Mg crystalline phase with a diameter of 3mm were prepared by copper die casting. The mechanical properties and deformation behavior of Mg-Cu-Dy based alloys were investigated. The results show that when Mg70Cu17Dy13 amorphous matrix composites are under compression, work-hardening is obtained and the maximum compressive strength is 702.38MPa and the plastic deformation rate is 0.81%. This is due to the effective carrying capacity of the Mg phase, the plastic deformation capacity and the effective inhibition of the Mg relative shear band and crack propagation, which can be confirmed from the shear deformation, the fracture mode and the dense droplet and unevenness on the fracture surface .