李慎兰,黄志其,蒋福利,陈维平,刘志铭,戚文军

• 1:华南理工大学机械与汽车工程学院
• 2:广东凤铝铝业有限公司
• 3:中南大学材料科学与工程学院
• 4:广州有色金属研究院

摘要(Abstract)：

采用光学显微镜(OM)、扫描电镜(SEM)和X射线衍射(XRD)等分析手段,研究固溶温度对6061铝合金热挤压板材的显微组织、力学性能及拉伸断口形貌的影响。结果表明,实验合金的强度和硬度随着固溶温度的升高而提高,当基体有轻微过烧时强度并没有降低;实验合金的最佳固溶工艺为565℃×40 min。XRD物相分析表明,在固溶处理过程中发生溶解的析出相粒子主要为Mg2Si,而残留的粗大析出相则主要是富Fe化合物。通过基体点阵常数的精确测量可以很好的表征合金的固溶程度。固溶处理后残留的析出相粒子是影响合金拉伸断口形貌的主要因素。当固溶温度低于535℃时,合金的断裂属于单一的韧窝断裂;当固溶温度高于535℃时,合金的断裂是由沿晶脆性断裂和韧窝断裂组成的混合断裂。

关键词(KeyWords)： 固溶温度;微观组织;力学性能;断口形貌

Abstract:

Keywords:

基金项目(Foundation): 中国博士后科学基金(2012M511552);; 广东省重大科技专项(2009A080205001)

作者(Author): 李慎兰,黄志其,蒋福利,陈维平,刘志铭,戚文军

DOI: 10.13289/j.issn.1009-6264.2013.05.026

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