Scholarlink

<p>This study elucidates the critical role of material vorticity in governing the microstructure evolution during friction stir welding (FSW) of aluminum alloys, with particular emphasis on tool pin geometry effects. A coupled thermomechanical simulation has been exploited to critically examine the vorticity generation which is followed by experimental validation for demonstrating its influence. The square pin tool produces the most intense vorticity (2838.29&#xa0;s⁻<sup>1</sup>), driving superior dynamic recrystallization (CDRX/DDRX) through its pulsating stirring action, as evidenced by a 72% increase in high-angle grain boundaries (HAGBs) compared to cylindrical pins. This vorticity-dominated material flow generates a unique thermal-strain synergy, with peak vorticity (1588.16&#xa0;s⁻<sup>1</sup>) occurring at 445.03&#xa0;°C, which optimally balances heat input and deformation energy for microstructure control. The resulting grain refinement and texture development enhance joint efficiency to 93% (UTS ~ 280&#xa0;MPa) while improving ductility by 69%, achieving an exceptional strength-ductility combination. The results establish vorticity as the governing parameter linking tool design to microstructure evolution, providing a framework for process optimization through targeted flow manipulation.</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

Microstructure evolution and recrystallization in friction stir welding process analyzed by material vorticity

  • 期刊论文

  • 发表日期：

    2025年9月20日

查看全文
  • Gaurav Chauhan,
  • Abhishek Pandey,
  • Mrinal Sahu,
  • Sudip Kumar Sinha,
  • Subhas Ganguly

摘要

This study elucidates the critical role of material vorticity in governing the microstructure evolution during friction stir welding (FSW) of aluminum alloys, with particular emphasis on tool pin geometry effects. A coupled thermomechanical simulation has been exploited to critically examine the vorticity generation which is followed by experimental validation for demonstrating its influence. The square pin tool produces the most intense vorticity (2838.29 s⁻1), driving superior dynamic recrystallization (CDRX/DDRX) through its pulsating stirring action, as evidenced by a 72% increase in high-angle grain boundaries (HAGBs) compared to cylindrical pins. This vorticity-dominated material flow generates a unique thermal-strain synergy, with peak vorticity (1588.16 s⁻1) occurring at 445.03 °C, which optimally balances heat input and deformation energy for microstructure control. The resulting grain refinement and texture development enhance joint efficiency to 93% (UTS ~ 280 MPa) while improving ductility by 69%, achieving an exceptional strength-ductility combination. The results establish vorticity as the governing parameter linking tool design to microstructure evolution, providing a framework for process optimization through targeted flow manipulation.