粉末粒度对快速凝固Al-8.32Fe-3.4Ce合金组织和性能的影响

Effect of Powder Size on the Structure and Properties of a Rapidly Solidified Al-8.32Fe-3.4Ce Alloy

用金相和扫描电镜观察等方法观察了尺寸不同的Al-Fe-Ce合金粉末的形貌与组织结构,并通过室温和高温拉伸、高温热暴露等试验对比了由不同粒度的粉末制成的Al-8.32Fe-3.4Ce合金性能及组织。研究结果发现,由细小粉末热挤压成形的试样,室温拉伸强度高达560MPa,而粗大粉末制成的试样强度只有450MPa。两种试样经热暴露后的拉伸性能也有很大差距。这充分表明了反映急冷速度的粉末粒度对合金和组织性能的巨大影响。

The morphology and microstructure of Al-8.32Fe-3. 4Ce alloy powders with different particulate sizeis observed by optical and SEM. The mechanical properties of Al-Fe-Ce alloy made from different particlesize have been determined by using room temperature tensile test, elevated temperature tensile test and hightemperature exposure test. The experimentul results show that a room temperature tensile strength of 560MPa has been achieved in as-extruded samples made from fine powders. However, the tensile strength ofas-extruded samples made trom fine coarse powders only shows 450MPa. The room temperature tensilestrength of two kinds of samples subjected high temperature exposure at 315℃ also shows large difference.This obviously indicated the tremendous Influence of powder size on the structure and mechanical propertiesof Al-Fe-Ce alloy.