李志强,王克鲁,董洪波,蔡增

• 1:南昌航空大学航空制造工程学院

摘要(Abstract)：

通过光学显微镜(OM),扫描电镜(SEM)及拉伸试验等研究了时效处理对5A06铝合金压铸件组织与性能的影响。结果表明:随着时效温度升高,合金压铸件的抗拉强度呈现先上升后下降的趋势,伸长率先降低后升高,最佳时效温度为240℃;在240℃时效过程中,合金压铸件的综合力学性能随着时效时间的延长呈现先上升后趋于平稳的趋势,最佳时效工艺为240℃×4 h,此时合金力学性能得到明显改善,抗拉强度提高了10.43%,伸长率略微降低,其强化机理主要为时效过程中进一步析出的β(Al_8Mg_5)相的第二相强化。时效处理后合金压铸件的断裂方式依旧为准解理断裂。

关键词(KeyWords)： 5A06铝合金压铸件;时效;析出强化

Abstract:

Keywords:

基金项目(Foundation): 江西省应用培养计划项目(20181BBG78001);; 航空科学基金项目(2015ZE56011)

作者(Author): 李志强,王克鲁,董洪波,蔡增

DOI: 10.13289/j.issn.1009-6264.2020-0351

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