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7A52铝合金激光焊接头单级时效行为研究
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内蒙古工业大学,内蒙古工业大学,内蒙古工业大学

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内蒙古青年科技英才领军人物项目(103-841025)


One-Step Aging Behavior of 7A52 Aluminum Alloy Laser Welding Joint
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Inner Mongolia University of Technology,Hohhot,Inner Mongolia University of Technology,Hohhot,Inner Mongolia University of Technology,Hohhot

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    摘要:

    通过力学性能、电导率测试、EDS分析和TEM分析,对7A52铝合金激光焊接头单级时效行为特征进行了研究,并确定了较为合理的单级时效工艺。结果表明,7A52铝合金激光焊焊缝和母材在不同温度下达到峰值硬度所需要的时间基本是一致的,当时效温度由120℃上升到160℃时,接头时效硬化速度明显加快,达到峰时效时间明显缩短。与120℃时的峰时效状态相比,经140℃,16h时效处理后的接头抗拉强度为351MPa,失重量为0.0070g/min,电导率为21.2MS/m,接头抗拉强度下降了1.13%,失重量增加了2.94%,电阻率却提升了12.2%,综合考虑以140℃保温16h单级时效工艺为宜。焊缝和母材的析出相均是MgZn2相,随时效时间的延长析出相逐渐增多粗化,且峰时效状态下的起主要强化作用的是η,相和GP区。

    Abstract:

    The one-step aging behavior of 7A52 aluminum alloy laser welding joint were characterized by mechanical properties, electrical conductivity test, EDS and TEM. It was found that the base metal and the weld joint of 7A52 aluminum alloy need almost same time to reach peak hardness under different temperatures. When the aging temperature was increased from 120℃ to 160℃, The age hardening rate of contact joint was noticeably accelerated and the time to reach peak hardness was significantly reduced. After aging 16h at 140℃, the tensile strength of joint, loss of weight and the conductivity were 351 MPa, 0.0070 g/min and 21.2 MS/m. Compared with the data after aging 24h at 120℃, the result shows 1.13% tensile strength of joint decrease, 2.94% loss of weight decrease and 12.2% conductivity increase. Thus aging 24h at 120℃ is considered as a reasonable one-step aging process. The precipitate phase of the welding joint and the base metal was MgZn2. At 140℃, the precipitate phase got an amount increase and coarsening with the aging time extending. And the main strengthening phase were η, phase (MgZn2) and GP zone at peak aging state.

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陈超,陈芙蓉,张慧婧.7A52铝合金激光焊接头单级时效行为研究[J].稀有金属材料与工程,2018,47(5):1589~1595.[Chen Chao, Chen Furong, Zhang Huijing. One-Step Aging Behavior of 7A52 Aluminum Alloy Laser Welding Joint[J]. Rare Metal Materials and Engineering,2018,47(5):1589~1595.]
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  • 收稿日期:2016-04-21
  • 最后修改日期:2016-06-02
  • 录用日期:2016-06-12
  • 在线发布日期: 2018-06-08
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