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<p>Ti‐6AL‐4V titanium alloy demonstrates exceptional characteristics, including superior specific strength, remarkable corrosion resistance, and excellent fatigue performance, rendering it indispensable in critical aerospace and maritime engineering applications. Despite the widespread adoption of MIG welding across diverse industrial contexts, limited research has comprehensively explored its implementation in titanium alloy joining processes. Conventional MIG welding of titanium alloys conventionally encounters significant metallurgical challenges, primarily manifested through non-uniform grain structure and heterogeneous microstructural distributions. To address these limitations, this investigation systematically introduces an alternating magnetic field as an innovative microstructural modification strategy, fundamentally aimed at elucidating its intrinsic mechanisms of grain refinement and phase transformation dynamics. Experimental findings reveal profound metallurgical insights: the welded joint exhibited no unexpected phase precipitations, while simultaneously facilitating <i>β</i>-to-<i>α</i> phase transitions. Notably, the <i>α</i> phase exhibits a strengthened preferred orientation, with maximum pole density substantially increasing from 47.46 to 63.10. The application of alternating magnetic field intervention demonstrated remarkable microstructural refinement, achieving a significant 30.8% reduction in average grain size compared to non-magnetic field conditions. Correspondingly, mechanical properties exhibited substantial enhancement: joint tensile strength escalated from 902 to 937&#xa0;MPa, and impact energy increased slightly from 50.6 to 57.2&#xa0;J. The proposed methodology presents a sophisticated approach to microstructural engineering in titanium alloy welding, offering valuable perspectives for advanced industrial applications and metallurgical processing.</p>

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The Synergistic Enhancement of Phase Transformation and Strength–Toughness in Ti‐6AL‐4V Titanium Alloy MIG Weld Joints under Alternating Magnetic Field

  • 期刊论文

  • 发表日期：

    2026年4月18日

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  • Yongkang Sheng,
  • Deyang Zhang,
  • Jun Wang,
  • Yong Zhao,
  • Feiyun Wang,
  • Juan Fu

摘要

Ti‐6AL‐4V titanium alloy demonstrates exceptional characteristics, including superior specific strength, remarkable corrosion resistance, and excellent fatigue performance, rendering it indispensable in critical aerospace and maritime engineering applications. Despite the widespread adoption of MIG welding across diverse industrial contexts, limited research has comprehensively explored its implementation in titanium alloy joining processes. Conventional MIG welding of titanium alloys conventionally encounters significant metallurgical challenges, primarily manifested through non-uniform grain structure and heterogeneous microstructural distributions. To address these limitations, this investigation systematically introduces an alternating magnetic field as an innovative microstructural modification strategy, fundamentally aimed at elucidating its intrinsic mechanisms of grain refinement and phase transformation dynamics. Experimental findings reveal profound metallurgical insights: the welded joint exhibited no unexpected phase precipitations, while simultaneously facilitating β-to-α phase transitions. Notably, the α phase exhibits a strengthened preferred orientation, with maximum pole density substantially increasing from 47.46 to 63.10. The application of alternating magnetic field intervention demonstrated remarkable microstructural refinement, achieving a significant 30.8% reduction in average grain size compared to non-magnetic field conditions. Correspondingly, mechanical properties exhibited substantial enhancement: joint tensile strength escalated from 902 to 937 MPa, and impact energy increased slightly from 50.6 to 57.2 J. The proposed methodology presents a sophisticated approach to microstructural engineering in titanium alloy welding, offering valuable perspectives for advanced industrial applications and metallurgical processing.