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<p>This study systematically examined the weld bonding mechanism and fretting wear behavior at the hot extruded interface of 1420 Aluminum–lithium (Al–Li) alloy for aerospace lightweighting. The effects of extrusion temperature (460–540&#xa0;°C) and extrusion ratio (1:2 and 1:4) on the interfacial bonding and fretting wear were investigated using microscopic characterization techniques. The results demonstrated that both high temperature (540&#xa0;°C) and high extrusion ratio (1:4) significantly improved weld bonding quality by reducing the volume and number of pores in the weld zone, accelerating grain refinement processes, and consequently enhancing interfacial bonding strength. As extrusion temperature and ratio increased, the average friction coefficient reduced from 0.51 to 0.09, and wear of scar size decreased from 1000 to 870&#xa0;μm.</p>

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Interfacial Welding Quality and its Impact on Fretting Wear Resistance of 1420 Al–Li Alloy Extruded Profiles

  • 期刊论文

  • 发表日期：

    2025年10月8日

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  • Yanxing Ding,
  • Daosheng Wen,
  • Beibei Kong,
  • Yanzhong Xu,
  • Qinghua Lv,
  • Hechao Lai,
  • Yuhang Wang,
  • Zhen Gong,
  • Ziqiang Yin,
  • Shouren Wang

摘要

This study systematically examined the weld bonding mechanism and fretting wear behavior at the hot extruded interface of 1420 Aluminum–lithium (Al–Li) alloy for aerospace lightweighting. The effects of extrusion temperature (460–540 °C) and extrusion ratio (1:2 and 1:4) on the interfacial bonding and fretting wear were investigated using microscopic characterization techniques. The results demonstrated that both high temperature (540 °C) and high extrusion ratio (1:4) significantly improved weld bonding quality by reducing the volume and number of pores in the weld zone, accelerating grain refinement processes, and consequently enhancing interfacial bonding strength. As extrusion temperature and ratio increased, the average friction coefficient reduced from 0.51 to 0.09, and wear of scar size decreased from 1000 to 870 μm.