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材料工程  2020, Vol. 48 Issue (2): 140-147    DOI: 10.11868/j.issn.1001-4381.2018.001007
  研究论文 本期目录 | 过刊浏览 | 高级检索 |
7075铝合金脉冲变极性等离子弧焊接头的双级时效行为
李国伟1,2, 梁亚红1,2, 陈芙蓉1,2, 韩永全1,2
1. 内蒙古工业大学 材料科学与工程学院, 呼和浩特 010051;
2. 内蒙古自治区轻金属材料重点实验室, 呼和浩特 010051
Two-stage aging behavior of pulse variable polarity plasma arc welding joint of 7075 aluminum alloy
LI Guo-wei1,2, LIANG Ya-hong1,2, CHEN Fu-rong1,2, HAN Yong-quan1,2
1. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
2. Inner Mongolia Key Laboratory of Light Metal Materials, Hohhot 010051, China
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摘要 通过力学性能、电导率测试和TEM分析,对10 mm厚7075铝合金脉冲变极性等离子弧焊(pulse variable polarity plasma arc welding,PVPPAW)接头的双级时效行为特征进行研究,并确定了较为合理的双级时效工艺。结果表明:7075铝合金PVPPAW接头的抗拉强度随着终时效温度的升高和终时效时间的延长先增大后减小。经160℃,12 h终时效处理后的接头抗拉强度为545.1 MPa,比焊态时提高了37%。此时接头的电导率为27.9% IACS,抗应力腐蚀性能有所提高。焊缝中心主要强化相为η'相和η相,随着终时效温度的升高和终时效时间的延长,晶内与晶界的析出相逐渐长大和粗化,晶界的无沉淀析出带变宽。
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李国伟
梁亚红
陈芙蓉
韩永全
关键词 7075铝合金脉冲变极性等离子弧焊双级时效显微组织性能    
Abstract:Two-stage aging behavior of pulse variable polarity plasma arc welding(PVPPAW)joint of 7075 aluminum alloy with thickness of 10 mm was studied by mechanical properties, electrical conductivity test and TEM analysis, and the reasonable two-stage aging process was determined. Results show that the tensile strength of 7075 aluminum alloy PVPPAW joints increases first and then decreases with the increase of second-step aging temperature and time. After second-step aging with 160℃/12 h, the tensile strength of joint is 545.1 MPa, which increases by 37% than as-weld. And the conductivity is 27.9%IACS, the resistance to stress corrosion is improved than as-weld. The main strengthening phases of the weld center are η' phase and η phase. The precipitated phases of grain interior and grain boundary grow up and become coarsened gradually, and the precipitated free zone in the grain boundary becomes wider with the increase of the second-step aging temperature and time.
Key words7075 aluminum alloy    PVPPAW    two-stage aging    microstructure    property
收稿日期: 2018-08-20      出版日期: 2020-03-03
中图分类号:  TG456.2  
通讯作者: 梁亚红(1982-),女,讲师,硕士,研究方向为铝合金及其应用,联系地址:内蒙古呼和浩特市新城区爱民街49号内蒙古工业大学材料科学与工程学院(010051),E-mail:liangyahong@imut.edu.cn     E-mail: liangyahong@imut.edu.cn
引用本文:   
李国伟, 梁亚红, 陈芙蓉, 韩永全. 7075铝合金脉冲变极性等离子弧焊接头的双级时效行为[J]. 材料工程, 2020, 48(2): 140-147.
LI Guo-wei, LIANG Ya-hong, CHEN Fu-rong, HAN Yong-quan. Two-stage aging behavior of pulse variable polarity plasma arc welding joint of 7075 aluminum alloy. Journal of Materials Engineering, 2020, 48(2): 140-147.
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http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2018.001007      或      http://jme.biam.ac.cn/CN/Y2020/V48/I2/140
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