丁云峰,陈康华,袁丁玲,周亮

• 1:中南大学轻质高强结构材料国防科技重点实验室
• 2:中南大学轻合金研究院
• 3:中南大学有色金属先进结构材料与制造协同创新中心

摘要(Abstract)：

通过透射电镜(TEM)、扫描电镜(SEM)、光学显微镜(OM)、力学性能测试、电导率测试以及晶间腐蚀、剥落腐蚀试验等研究了非等温时效(NIA)与峰时效(T6)、高温回归再时效(RRA)对Al-Zn-Mg-Cu铝合金力学性能与腐蚀性能的影响。结果表明:与RRA和T6时效制度相比,合金在这种NIA时效(40℃→180℃,升温速率T_u:20℃/h; 180℃→100℃,降温速率T_d:40℃/h)下,晶内发生了沉淀析出、粗化以及二次沉淀现象,合金强度与T6态相当,伸长率明显提高;同时电导率和腐蚀性能也在RRA时效的基础上得到进一步改善。

关键词(KeyWords)： 非等温时效;Al-Zn-Mg-Cu合金;力学性能;腐蚀性能;析出相

Abstract:

Keywords:

基金项目(Foundation): 国防科技重点实验室稳定支持项目(20190104);; 国家自然科学基金重大科研仪器设备研制专项(51327902);; 国家重点研发计划(2016YFB0300801)

作者(Author): 丁云峰,陈康华,袁丁玲,周亮

DOI: 10.13289/j.issn.1009-6264.2020-0329

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