伍波,李龙,夏承东,韩银娜,周德敬

• 1:银邦金属复合材料股份有限公司技术研究院
• 2:江苏省金属层状复合材料重点实验室

摘要(Abstract)：

采用光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、X射线衍射(XRD)和差示扫描量热仪(DSC)等分析手段研究了Al-7.0Zn-2.9Mg合金板在制备过程中及不同时效热处理工艺下的显微组织及力学性能。结果表明,Al-7.0Zn-2.9Mg合金铸态组织主要由α(Al)+Mg_(32)(Al,Zn)_(49)(T)相共晶组织、Al(Fe,Mn)Si相和少量过剩T相组成。经均匀化处理后,共晶相基本溶入基体中,基体中又重新析出MgZn_2粒子及少量Al_3Zr相。热轧后的晶粒组织沿轧制方向呈纤维状分布。试验了一种低温时效+常规时效的LTA工艺,结果显示,LTA态的合金强度和伸长率均略高于峰值时效(T6)和回归再时效(RRA)态。同时,析出相尺寸明显大于T6、RRA和双极时效(T73)态,且晶界析出相呈粗大不连续分布,具有较好的抗应力腐蚀开裂(SCC)潜力。

关键词(KeyWords)： Al-7.0Zn-2.9Mg铝合金;固溶时效处理;显微组织;力学性能

Abstract:

Keywords:

基金项目(Foundation): 江苏省重点实验室资助项目(BM2014006);; 江苏省科技成果转化专项资金项目(BA2015079);; 重点国别及机构产业技术合作项目(BZ2016004);; 无锡市科技发展资金项目(CZE02H1504)

作者(Author): 伍波,李龙,夏承东,韩银娜,周德敬

DOI: 10.13289/j.issn.1009-6264.2016-X348

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