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新型Al-Zn-Mg-Cu合金TIG焊接头组织与性能研究
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北京工业大学,北京工业大学

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TG407

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国家重点基础研究发展计划(973计划)


Study on microstructure and mechanical properties of joints of a new Al-Zn-Mg-Cu alloy welded by TIG
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Beijing University of Technology,Beijing University of Technology

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    摘要:

    本文对一种Al-Zn-Mg-Cu-Mn-Zr-Er合金薄板进行了全自动TIG填丝焊接,观察接头微观组织形貌,并测试其力学性能。结果显示焊缝未出现典型的联生结晶形貌,而是由等轴细晶粒层和大量等轴树枝晶构成,在晶界或枝晶间断续分布复合T(AlZnMgCu)相;焊接热影响区因沉淀相变化,硬度值不同,分为近缝的固溶区和远缝的过时效区,晶粒保持与母材相同的拉长形貌,未见明显长大;接头横截面的显微硬度最低值在焊缝,约为120HV,母材显微硬度约为184HV,接头抗拉强度为421.75MPa,达到母材的65.08%,拉伸断裂位置处于焊缝中,断口形貌为典型的韧性断裂,等轴韧窝底部存在破碎的第二相颗粒,其成分与焊缝中复合T相基本一致。

    Abstract:

    In this study, sheets of a new Al-Zn-Mg-Cu alloy have been welded using automatic TIG welding with filler wire. The microstructure characteristics and mechanical properties of weld joints were analyzed. Results showed that the fusion zone (FZ) is comprised of non-dendritic equiaxed grain zone (EQZ) and coarser dendritic equiaxed grains, and the fusion boundary does not appear to nucleate epitaxially from the heat affected zone (HAZ) substrate, the compound T (AlZnMgCu) phase precipitates discretely on grain boundaries; the HAZ is divided into the solid solution zone that is close to the FZ and overaging zone which is farther away from the FZ because of an alteration of the strengthening precipitates, they possess different microhardness values, grains in the HAZ are elongated as same as the base metal (BM) and not coarser compared with the BM; The minimum microhardness of the joint is obtained in the FZ and the value is approximately 120HV, and that of the BM is about 184HV, the ultimate tensile strength of joints is 421.75MPa which is 65.08% of that of the BM, samples of the tensile test fracture at the FZ and the fractured surface is ductile fracture characteristics, small particles whose composition is almost same with the compound T phase are observed at the bottom of dimples.

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张亮,李晓延.新型Al-Zn-Mg-Cu合金TIG焊接头组织与性能研究[J].稀有金属材料与工程,2016,45(3):696~701.[zhangliang, lixiaoyan. Study on microstructure and mechanical properties of joints of a new Al-Zn-Mg-Cu alloy welded by TIG[J]. Rare Metal Materials and Engineering,2016,45(3):696~701.]
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历史
  • 收稿日期:2014-04-10
  • 最后修改日期:2014-05-16
  • 录用日期:2014-06-04
  • 在线发布日期: 2016-07-07
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