Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第31卷    第2期    总第263期    2021年2月

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文章编号:1004-0609(2021)-02-0289-09
微量Er和Zr对Al-Mg合金再结晶行为和焊接性能的影响
吴 浩,郑志凯,任思蒙,李书磊,赵丕植

(中铝材料应用研究院有限公司,北京102209)

摘 要: 本文研究了微量Er和Zr元素对Al-Mg合金再结晶行为及组织演变的影响,同时探讨Er和Zr元素对稳定化态合金的FSW和MIG焊接接头组织和力学性能的影响。结果表明:复合添加Er和Zr元素能够有效抑制Al-Mg-Er-Zr合金冷轧板再结晶和晶粒长大行为,与Al-Mg和Al-Mg-Zr合金相比,其再结晶起始温度和结束温度分别提高至225 ℃和450 ℃,稳定化态板材强度提高30 MPa以上;同时,Er和Zr元素的复合添加能够有效削弱由于焊接热量输入产生的板材形变组织再结晶软化作用,减小热影响区再结晶组织宽度,改善合金焊接接头组织,提高焊接接头性能。Al-Mg-Er-Zr合金的FSW和MIG焊接系数分别提高到85.7%和80%。

 

关键字: Al-Mg-Er-Zr合金;再结晶行为;焊接性能;显微组织

Effects of Er and Zr micro-additions on recrystallization behavior and welding properties of Al-Mg alloy
WU Hao, ZHENG Zhi-kai, REN Si-meng, LI Shu-lei, ZHAO Pi-zhi

Chinalco Materials Application Research Institute Co., Ltd., Beijing 102209, China

Abstract:The effects of Er and Zr micro-additions on the recrystallization behavior and microstructure evolution of Al-Mg alloy were researched, and meanwhile, the microstructure and mechanical properties of the FSW and MIG welding joints were also analyzed. The results show that the recrystallization and grain growth behavior of Al-Mg-Er-Zr alloy can be inhibited effectively by microalloying with Er and Zr. Compared with Al-Mg and Al-Mg-Zr alloys, the recrystallization start temperature and end temperature of Al-Mg-Er-Zr alloy increase to 225 ℃ and 450 ℃, respectively, and the yield strength and tensile strength increase by more than 30 MPa. Moreover, the recrystallization softening effect of the deformed microstructure, due to the welding temperature field and welding heat input, can be weaken by microalloying with Er and Zr, the width of recrystallization zone in HAZ is reduced, the microstructure and properties of welded joints are improved. The FSW and MIG welding coefficients of Al-Mg-Er-Zr alloy increase to 85.7% and 80%, respectively.

 

Key words: Al-Mg-Er-Zr alloy; recrystallization behavior; welding properties; microstructure

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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