邱克强,郭强,热焱,尤俊华,任英磊,李荣德

• 1:沈阳工业大学材料科学与工程学院

摘要(Abstract)：

为了确定挤压态Mg-5Sn-2Si-2Sr合金合适的热处理方案,分别采用硬度计、X射线衍射仪、力学性能试验机、光学显微镜,研究了该合金经T4(固溶处理)、T5(200℃×12 h时效)和T6(固溶+时效)热处理后显微组织及力学性能的变化。结果表明:挤压态Mg-5Sn-2Si-2Sr合金宜采用T5热处理工艺。经T5热处理后,在晶界处析出大量Mg2Si强化相,使合金的屈服强度、抗拉强度分别达210.9 MPa、257.0 MPa,高于挤压态、T4和T6热处理工艺下的合金强度。T4热处理时,固溶强化作用远小于退火软化作用,致使合金力学性能的下降。T6热处理时,析出相及晶粒尺寸的长大使得合金力学性能的提高受到了限制。

关键词(KeyWords)： Mg-5Sn-2Si-2Sr合金;热挤压;固溶处理;时效;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 沈阳市科技计划项目(F12-277-1-34;F12-277-1-35)

作者(Author): 邱克强,郭强,热焱,尤俊华,任英磊,李荣德

DOI: 10.13289/j.issn.1009-6264.2013.10.016

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