陈宇航,屈华,付佳玉,刘伟东,霍颜权,崔庆辉

• 1:辽宁工业大学材料科学与工程学院
• 2:锦州华新电力电子有限公司

摘要(Abstract)：

利用金相显微镜、扫描电镜(SEM)、能谱仪(EDS)、电子背散射衍射技术(EBSD)、电子万能实验机和电化学工作站等研究了固溶处理、时效处理和固溶+时效处理对2A12铝合金脉冲MIG焊接接头显微硬度、抗拉强度、断口形貌、耐蚀性能和元素分布的影响。结果表明：热处理后，接头晶粒尺寸均有所增大，焊缝区晶粒形态无变化均为等轴晶，Cu元素偏析现象基本消除，强化相S(Al_2CuMg)相和θ(Al_2Cu)相重新弥散析出，接头断口中的韧窝变小、密度变大、深度增加、撕裂棱和解理面减少，接头硬度升高，抗拉强度与伸长率提高，耐蚀性升高；与固溶处理、时效处理的接头相比，固溶+时效处理后，接头中的析出相颗粒数量更多，分布更均匀，接头整体硬度最大(焊缝区平均硬度达到121 HV0.1),接头抗拉强度和伸长率最大分别为445.7 MPa和9.6%,分别达到了母材的98.4%和73.8%,焊缝腐蚀电位和电流阻抗曲线半径最大，焊缝的耐蚀性最高。

关键词(KeyWords)： 2A12铝合金;脉冲MIG焊;焊后热处理;力学性能

Abstract:

Keywords:

基金项目(Foundation): 辽宁省教育厅面上项目(LJKMZ20220958,LJK20621);; 辽宁省“兴辽英才计划”教学名师项目(XLYC221026)

作者(Author): 陈宇航,屈华,付佳玉,刘伟东,霍颜权,崔庆辉

DOI: 10.13289/j.issn.1009-6264.2025-0106

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