Scholarlink

<p>In the friction stir lap welding (FSLW) of Al/steel, the joint is prone to forming brittle Al-Fe intermetallic compounds (IMCs). Introducing an interlayer can effectively regulate IMCs and strengthen the mechanical properties of the joint. In this work, 6061-T6 aluminum alloy and QP1180 steel were joined by FSLW with a Ni interlayer. The microstructures and mechanical properties of the joints without and with the Ni interlayer were characterized. The types and formation sequence of IMCs at the joint interface were investigated, and the evolution mechanism of IMCs was elucidated. The results indicate that the Ni interlayer directly inhibits Al-Fe reactions and promotes the formation of the Al-Ni reaction layer. Furthermore, theoretical calculations demonstrate that the preferential Al-Ni reaction suppresses the formation of brittle Al-Fe IMCs, which reduces interface stress concentration and enhances the shear properties of the joint. The shear strength increased to 8.22 ± 0.09&#xa0;kN for the Al-Ni-Fe joint, an increase of approximately 9.2% compared to the Al-Fe joint.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Evolution Mechanism of Intermetallic Compounds and Mechanical Properties of Friction Stir Lap Welded Aluminum Alloy and Steel with Ni Interlayer

  • 期刊论文

  • 发表日期：

    2026年7月6日

查看全文
  • Feng Gao,
  • Yuanyi Wang,
  • Ke Qiao,
  • Zhengyang Hao,
  • Shanyong Chen,
  • Ruizhao Xu,
  • Jun Cai,
  • Wen Wang,
  • Kuaishe Wang

摘要

In the friction stir lap welding (FSLW) of Al/steel, the joint is prone to forming brittle Al-Fe intermetallic compounds (IMCs). Introducing an interlayer can effectively regulate IMCs and strengthen the mechanical properties of the joint. In this work, 6061-T6 aluminum alloy and QP1180 steel were joined by FSLW with a Ni interlayer. The microstructures and mechanical properties of the joints without and with the Ni interlayer were characterized. The types and formation sequence of IMCs at the joint interface were investigated, and the evolution mechanism of IMCs was elucidated. The results indicate that the Ni interlayer directly inhibits Al-Fe reactions and promotes the formation of the Al-Ni reaction layer. Furthermore, theoretical calculations demonstrate that the preferential Al-Ni reaction suppresses the formation of brittle Al-Fe IMCs, which reduces interface stress concentration and enhances the shear properties of the joint. The shear strength increased to 8.22 ± 0.09 kN for the Al-Ni-Fe joint, an increase of approximately 9.2% compared to the Al-Fe joint.