曲来鹏,马宁,肖笑,张柯柯

• 1:河南科技大学材料科学与工程学院
• 2:有色金属新材料与先进加工技术省部共建协同创新中心

摘要(Abstract)：

采用光学显微镜(OM)、扫描电镜(SEM)、电子背散射衍射(EBSD)技术及显微硬度仪等研究了6061-T6铝合金搅拌摩擦焊曲线搭接接头的显微组织和性能，重点研究了半径R对接头成形和力学性能的影响。结果表明：对于小半径(R<7 mm)的6061-T6铝合金搭接搅拌摩擦焊，会出现严重的焊接材料堆积。当半径R超过7 mm时，可以形成良好的宏观接头。接头拐角处的不同区域均由α-Al和金属间析出相β组成。热影响区(HAZ)的显微组织相对粗糙，焊核区(WNZ)颗粒最细，溶解了部分的β相。在拐角的中央WNZ处，晶粒尺寸比两端大，拐角内侧晶粒尺寸较外侧更大。接头的硬度分布呈现出“W”形，内侧HAZ区域的硬度最低。当R≤7 mm时，随着R的增加，接头的抗剪强度增加，R>7 mm时，接头抗剪强度的变化变得相对较小。在R=7 mm时，接头的抗剪强度最大，为(101.32±6.89) MPa,断裂机制主要是韧性断裂主导的混合断裂。

关键词(KeyWords)： 铝合金;曲线;搅拌摩擦焊;微观结构;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(U1604132);; 中原基础研究领军人才(ZYYCYU202012130);; 河南省科学院科研开发专项(220910009)

作者(Author): 曲来鹏,马宁,肖笑,张柯柯

DOI: 10.13289/j.issn.1009-6264.2023-0165

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