殷剑,金康,黎诚

• 1:北京机电研究所有限公司
• 2:中机精密成形产业技术研究院(安徽)股份有限公司

摘要(Abstract)：

采用扫描电镜(SEM)、能谱仪(EDS)、X射线衍射(XRD)、电子背散射衍射(EBSD)和万能材料试验机等研究了时效处理对7022铝合金组织及性能的影响。结果表明:固溶处理后的7022铝合金的组织主要由α-Al、MgZn_2、Al_2CuMg和Al_7Cu_2Fe相组成。随着时效的进行,Al_2CuMg和Al_7Cu_2Fe相逐渐溶解,并且Cu原子替代Zn原子形成与MgZn_2性质类似的Mg(Zn, Cu, Al)_2相,并产生显著的时效析出硬化效应。同时晶粒出现明显长大,在70℃下时效10 h、110℃下时效10和14 h和150℃下时效10 h后晶粒尺寸的增长率分别为10.8%、16.2%、27.0%和35.1%。试样的抗拉强度、屈服强度和伸长率受析出强化和细晶强化的共同影响,最大值分别为617.3 MPa、568.6 MPa和25.8%。试样的断裂行为主要受到晶粒尺寸和第二相数目、尺寸的影响。

关键词(KeyWords)： 7022铝合金;时效处理;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 殷剑,金康,黎诚

DOI: 10.13289/j.issn.1009-6264.2021-0352

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