微量<strong>Sc</strong>对<strong>Al-Zn-Mg</strong>合金焊接接头组织和性能的影响

doi:10.11901/1005.3093.2019.064

材料研究学报

2019, Vol. 33

Issue (9): 673-682 DOI: 10.11901/1005.3093.2019.064

研究论文

本期目录 | 过刊浏览

微量Sc对Al-Zn-Mg合金焊接接头组织和性能的影响

李召明^1,²,姜海昌¹(

),闫德胜¹,张洪亮²,戎利建¹,武　飞

1. 中国科学院金属研究所核材料安全与评价重点实验室沈阳 110016
2. 沈阳航空航天大学材料科学与工程学院沈阳 110136
3. 大连四达高技术发展有限公司大连 116023

Effect of Minor Sc on Microstructure and Properties of Al-Zn-Mg Alloy Weld Joint

LI Zhaoming^1,²,JIANG Haichang¹(

),YAN Desheng¹,ZHANG Hongliang²,RONG Lijian¹,WU Fei

1. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China
3. Dalian Starts Co. Ltd. , Dalian 116023, China

引用本文:

李召明,姜海昌,闫德胜,张洪亮,戎利建,武　飞. 微量Sc对Al-Zn-Mg合金焊接接头组织和性能的影响[J]. 材料研究学报, 2019, 33(9): 673-682.
Zhaoming LI, Haichang JIANG, Desheng YAN, Hongliang ZHANG, Lijian RONG, Fei WU. Effect of Minor Sc on Microstructure and Properties of Al-Zn-Mg Alloy Weld Joint[J]. Chinese Journal of Materials Research, 2019, 33(9): 673-682.

全文: PDF(27080 KB) HTML

摘要:

使用光学显微镜、扫描电镜和透射电镜分析了Al-Zn-Mg合金和含微量钪的Al-Zn-Mg合金钨极氩弧焊接头的微观组织，并对其力学性能和耐应力腐蚀性能进行了对比。结果表明：在传统Al-Zn-Mg合金板材熔合线附近的热影响区出现再结晶和晶粒异常长大，而含钪Al-Zn-Mg合金基体中热稳定性优良的纳米Al₃(Sc, Zr, Ti)相在焊接过程中能阻碍晶界迁移，抑制再结晶晶粒的形核和长大，进而细化熔合线附近的组织。同时，含微量钪的Al-Zn-Mg合金焊接接头的强度明显比传统合金的高，其强化效果主要来源于熔合线附近区域的细晶强化和二次Al₃(Sc, Zr, Ti)相的弥散强化。

关键词 ：金属材料, Al-Zn-Mg合金, 钪添加, Al₃(Sc Zr Ti)相, 再结晶, 钨极氩弧焊

Abstract：

The microstructures, tensile properties and stress corrosion cracking resistance of tungsten inert gas weld joints of Al-Zn-Mg alloy and Al-Zn-Mg alloy with 0.06% (mass fraction) Sc were comparatively investigated by means of optical microscope, scanning electron microscope, transmission electron microscopy, electronic universal testing machine and slow strain rate test. The results show that recrystallization with abnormal grain growth occurred in heat affected zone near the fusion line of the traditional Al-Zn-Mg alloy, while the excellent thermal stability of secondary Al₃(Sc, Zr, Ti) phase existed in the Al-Zn-Mg alloy with 0.06% Sc, which could hinder the grain boundary migration during the welding process, thereby inhibit the nucleation and growth of recrystallized grains and then refine the grain size in the matrix near the fusion line. At the same time, the strength of the weld joint for Al-Zn-Mg alloy with 0.06% Sc is obviously higher than that for Al-Zn-Mg alloy, which is mainly related to the grain-boundary strengthening and dispersion strengthening caused by secondary Al₃(Sc, Zr, Ti) phase.

Key words： metallic materials Al-Zn-Mg alloy Sc addition Al₃(Sc Zr Ti) phase recrystallization tungsten inert gas welding

收稿日期: 2019-01-16

ZTFLH:

TG146

基金资助:国家重点研发计划(2016YFB1200501);中科院战略先导B(XDB22020200);辽宁省自然科学基金(20170540688)

作者简介: 李召明，男，1988年生，讲师

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.064 或 https://www.cjmr.org/CN/Y2019/V33/I9/673

表1 ER5356焊丝的成分

图1 Al-Zn-Mg-(Sc)板材边缘的金相组织

图2 Al-Zn-Mg-(Sc)板材边缘的TEM形貌和衍射谱

表2 Al-Zn-Mg-(Sc)板材的室温拉伸性能

图3 Al-Zn-Mg-(Sc)板材的拉伸断口形貌

图4 Al-Zn-Mg-(Sc)合金焊接接头的外观形貌

图5 Al-Zn-Mg-(Sc)板材焊接接头焊缝区的显微组织和焊缝区-热影响区过渡区的显微组织

图6 Al-Zn-Mg-(Sc)板材焊接接头焊缝区和热影响区的TEM形貌和衍射谱

表3 Al-Zn-Mg-(Sc)板材焊接接头的拉伸性能

图7 Al-Zn-Mg-(Sc)板材焊接接头拉伸断裂位置的正面和侧面照片

图8 Al-Zn-Mg-(Sc)板材焊接接头拉伸断口中焊缝区和热影响区的形貌

图9 Al-Zn-Mg-(Sc)合金焊接接头在空气中和3.5% NaCl溶液中的应力-应变曲线

图10 Al-Zn-Mg-(Sc)合金焊接接头在空气中和3.5% NaCl溶液中的断口形貌

图11 Al-Zn-Mg-(Sc)合金中析出相质量分数与温度的关系

图12 Al-Zn-Mg-(Sc)合金焊接接头截面的形貌

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