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时效处理后铝合金焊接接头组织和性能的变化规律
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内蒙古工业大学

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国家自然科学基金(51765053)、草原英才(DC1800007434) 、 内蒙古自治区轻金属材料与自然科学基金内蒙古重点实验室(2017MS0502)


The change rule of microstructure and properties of aluminum alloy welded joints after aging treatment
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the Natural Science Foundation of China (51765053), the Grassland talents (dc1800007434), the Inner Mongolia Key Laboratory of light metal materials and Natural Science Foundation of Inner Mongolia Autonomous Region (2017MS0502).

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    摘要:

    本文主要是研究时效处理温度和时效保温时间对7075铝合金激光焊接头组织和性能的变化规律,使用扫描电镜观察焊接过程中形成的链条状的T相随着保温时间的延长,逐渐熔断进入基体,时效处理温度120 ℃保温24hT相呈均匀分布的球状,减少了其对基体的割裂作用。通过TEM和SADE图可以看出[011]Al、[12]Al、[001]Al晶带轴均析出纳米级强化相η"相,阻碍位错运动提高焊缝的力学性能,随着时间的延长η"相尺寸、分布密度发生变化,逐渐变成η相。通过对比显微硬度和抗拉强度,时效处理温度120 ℃保温24h时7075铝合金激光焊接头的力学性能最好。

    Abstract:

    This paper mainly studied the change rule of aging treatment temperature and aging holding time on the structure and performance of 7075 aluminum alloy laser weld. Scanning Electron Microscopy (SEM) was used to observe the chain T phase formed during welding. With the extension of heat preservation time, the T phase melted into the substrate gradually. After aging treatment temperature 120 ℃ at 24 h,the T phasewas uniformly distributed in a spherical shape, which reduced its cleavage effect on the matrix. TEM and SADE image showed that the nanoscaleη" phase was precipitated on the crystal axis of [011]Al、[12]Al、[001]Al. With the extension of time, the size and distribution density of η" changed and gradually becameη. The phase prevented dislocation movement to improve the mechanical properties of welds. By comparing the microhardness and tensile strength, 7075 aluminum alloy laser welded joint has the best mechanical properties by aging treatment temperature 120 ℃ at 24 h.

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丁亚茹,陈芙蓉.时效处理后铝合金焊接接头组织和性能的变化规律[J].稀有金属材料与工程,2021,50(11):4051~4058.[Ding Yaru, Chen Furong. The change rule of microstructure and properties of aluminum alloy welded joints after aging treatment[J]. Rare Metal Materials and Engineering,2021,50(11):4051~4058.]
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  • 收稿日期:2020-11-19
  • 最后修改日期:2021-02-02
  • 录用日期:2021-02-04
  • 在线发布日期: 2021-11-30
  • 出版日期: 2021-11-24