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首页> 外文会议>International Conference on Processing amp; Manufacturing of Advanced Materials Pt.1; Jul 7-11, 2003; Leganes, Madrid, Spain >Optimisation of mechanical properties of an AZ 91 alloy by microstructure control
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Optimisation of mechanical properties of an AZ 91 alloy by microstructure control

机译：通过微结构控制优化AZ 91合金的力学性能

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摘要

Magnesium alloys are particularly attractive due to their low density but they generally exhibit moderate mechanical properties at room temperature and due to the hcp structure, conventional forming techniques may be difficult to apply. A way to partly overcome these difficulties is to reduce the grain size since it may increase the yield stress and promote superplastic forming. Grain refinement can be achieved by conventional extnision but recently equal channel angular extrusion (ECAE) has been applied successfully in the case of magnesium alloys. This paper focuses on the effect of such thermo-mechanical treatments on the microstructure and resulting mechanical properties at both room and high temperatures of an AZ 91 alloy. Depending on the conditions of treatment, the yield stress can reach values close to 400 MPa and elongations to fracture of about 1000 % are obtained in the superplastic regime. Nevertheless, the effect of grain refinement on mechanical properties must be considered with care since other strengthening effects may be induced by the processing route.
机译：镁合金由于其低密度而特别有吸引力，但是它们通常在室温下表现出适度的机械性能，并且由于hcp结构，常规的成型技术可能难以应用。克服这些困难的一种方法是减小晶粒尺寸，因为它可能会增加屈服应力并促进超塑性成形。晶粒细化可以通过常规的挤压来实现，但是最近在镁合金的情况下已经成功应用了等通道角挤压（ECAE）。本文着重介绍了这种热机械处理对AZ 91合金在室温和高温下的微观结构以及所产生的机械性能的影响。根据处理条件的不同，屈服应力可以达到接近400 MPa的值，在超塑性状态下可获得约1000％的断裂伸长率。然而，必须谨慎考虑晶粒细化对机械性能的影响，因为加工过程可能会诱发其他强化作用。

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