(中鋁材料應(yīng)用研究院有限公司，北京102209)
摘 要: 本文研究了微量Er和Zr元素對(duì)Al-Mg合金再結(jié)晶行為及組織演變的影響，同時(shí)探討Er和Zr元素對(duì)穩(wěn)定化態(tài)合金的FSW和MIG焊接接頭組織和力學(xué)性能的影響。結(jié)果表明：復(fù)合添加Er和Zr元素能夠有效抑制Al-Mg-Er-Zr合金冷軋板再結(jié)晶和晶粒長(zhǎng)大行為，與Al-Mg和Al-Mg-Zr合金相比，其再結(jié)晶起始溫度和結(jié)束溫度分別提高至225 ℃和450 ℃，穩(wěn)定化態(tài)板材強(qiáng)度提高30 MPa以上；同時(shí)，Er和Zr元素的復(fù)合添加能夠有效削弱由于焊接熱量輸入產(chǎn)生的板材形變組織再結(jié)晶軟化作用，減小熱影響區(qū)再結(jié)晶組織寬度，改善合金焊接接頭組織，提高焊接接頭性能。Al-Mg-Er-Zr合金的FSW和MIG焊接系數(shù)分別提高到85.7%和80%。
關(guān)鍵字: Al-Mg-Er-Zr合金；再結(jié)晶行為；焊接性能；顯微組織
（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
