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Microstructure and mechanical properties of AZ91D magnesium alloy prepared by compound extrusion

机译：复合挤压法制备AZ91D镁合金的组织和力学性能

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摘要

Based on conventional extrusion and equal channel angular extrusion (ECAE), a new severe plastic deformation (SPD) method called compound extrusion is developed to fabricate fine-grained AZ91D magnesium alloys. The fine grain size of 6μm is obtained as the accumulated strain increased to 9.146. The AZ91D alloy treated by compound extrusion exhibits good mechanical properties, with a yield strength of 202.2 MPa, a tensile strength of 323.1 MPa and an elongation to fracture of 14.8%. The good mechanical properties of AZ91D alloy treated by compound extrusion are due to grain refinement and to the homogeneous distribution of intermetallic particles. The success in development of compound extrusion proves that compound extrusion can offer a good opportunity for the development of good mechanical properties of as-cast magnesium alloys.
机译：基于常规挤压和等通道角挤压（ECAE），开发了一种称为复合挤压的新的严重塑性变形（SPD）方法，以制造细晶粒的AZ91D镁合金。随着累积应变增加至9.146，可获得6μm的细晶粒尺寸。经复合挤压处理的AZ91D合金具有良好的机械性能，屈服强度为202.2 MPa，抗拉强度为323.1 MPa，断裂伸长率为14.8％。通过复合挤压处理的AZ91D合金的良好机械性能归因于晶粒细化和金属间颗粒的均匀分布。复合材料挤压技术的成功开发证明，复合材料挤压技术为发展铸态镁合金的良好机械性能提供了良好的机会。

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