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首页> 外文期刊>Materials Science and Engineering >Effects of deep cryogenic treatment and low-temperature aging on the mechanical properties of friction-stir-welded joints of 2024-T351 aluminum alloy
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Effects of deep cryogenic treatment and low-temperature aging on the mechanical properties of friction-stir-welded joints of 2024-T351 aluminum alloy

机译：深低温处理和低温时效对2024-T351铝合金搅拌摩擦焊接接头力学性能的影响

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摘要

Low-temperature aging treatments at 120 ℃ for 8 h, with and without deep cryogenic pretreatments, were conducted for friction-stir-welded joints of 2024-T351 aluminum alloys. The microstructures and mechanical properties of the welded joints after the above treatments were investigated. Two obvious soft zones were found to be located at the retreating and advancing sides of the heat-affected zone (HAZ) in the as-welded joint. After a single low-temperature aging treatment (LTA), the soft regions close to the base metal in the HAZ almost vanished, while the soft regions close to the thermal-mechanical-affected zone were not significantly affected. Moreover, tensile fracture occurred along the segregation bands of the precipitates in the nugget zone (NZ). This resulted in a decrease in the elongation of the as-welded joint from 74％ to 38％ that of the base metal. After low-temperature aging with a deep cryogenic pretreatment at 77 K, the features of the soft zones were similar to those in the case of the single LTA, but the tensile fracture at the segregation bands in the NZ was inhibited. Consequently, the elongation of the joints improved along with an increase in tensile strength. The possible mechanisms related to the improvement of tensile properties of the joints were discussed.
机译：对2024-T351铝合金的摩擦搅拌焊接接头进行了120℃的低温时效处理8 h，有无深冷预处理。研究了上述处理后的焊接接头的组织和力学性能。在焊接接头中，在热影响区（HAZ）的后退和前进侧发现了两个明显的软区。经过一次低温时效处理（LTA）后，热影响区中靠近母材的软区几乎消失，而靠近热机械影响区的软区并未受到明显影响。此外，在熔核区（NZ）中，沿析出物的偏析带发生拉伸断裂。这导致焊接后接头的伸长率从母材的伸长率从74％降低到38％。经过77 K的深低温预处理的低温老化后，软区的特征与单个LTA的情况相似，但NZ偏析带的拉伸断裂得到了抑制。因此，接头的伸长率随着抗拉强度的增加而提高。讨论了与改善接头抗拉性能有关的可能机理。

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  • 来源
    《Materials Science and Engineering》 |2014年第15期|147-153|共7页
  • 作者

    Ji Wang; Ruidong Fu; Yijun Li; Jianfeng Zhang;

  • 作者单位

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004,PR China College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, PR China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004,PR China College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, PR China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004,PR China College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, PR China;

    State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, Hebei 066004,PR China College of Materials Science and Engineering, Yanshan University, Qinhuangdao, Hebei 066004, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aluminum alloys; Friction stir welding; Deep cryogenic treatment; Low-temperature aging; Tensile properties;

    机译：铝合金;搅拌摩擦焊;深低温处理;低温老化;拉伸性能;

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