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<p>This study introduces ultrasonic vibration-assisted milling (UVAM) of γ<b>-</b>TiAl alloys, comparing it with conventional milling (CM) to analyze the surface roughness, hardened layer depth, residual stress, tensile and fatigue properties, and fracture mechanisms of γ<b>-</b>TiAl workpieces. The dimensions of the workpiece are 12&#xa0;mm × 12&#xa0;mm × 5&#xa0;mm; the results indicate that the roughness of γ<b>-</b>TiAl workpieces machined with UVAM is as low as 0.202&#xa0;μm, which is an improvement of 40.76% compared to CM. The maximum compressive residual stress generated was 841.8&#xa0;MPa, 91.8% higher than CM. Under identical loading conditions, UVAM TiAl alloy specimens exhibited a tensile strength of 547.39&#xa0;MPa, 13% higher than CM TiAl alloy. The thickness of the fatigue specimens is 5&#xa0;mm, at a maximum loading stress of 395&#xa0;MPa, the maximum stress percentage for UVAM was 72.18%, while for CM, it was 83.02%. The fatigue life of ultrasonically milled specimens was 9303 cycles, a 63.44% improvement over CM. The study also analyzes the fatigue fracture mechanism, providing guidance for UVAM of γ<b>-</b>TiAl alloys.</p>

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Study on surface roughness, hardened layer, residual stress, and fatigue fracture performance of γ-TiAl alloys processed by ultrasonic vibration-assisted milling

  • 期刊论文

  • 发表日期：

    2025年6月7日

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  • Xinzheng Wang,
  • Yangxuan Song,
  • Zhenhua Wang,
  • Lei Huang

摘要

This study introduces ultrasonic vibration-assisted milling (UVAM) of γ-TiAl alloys, comparing it with conventional milling (CM) to analyze the surface roughness, hardened layer depth, residual stress, tensile and fatigue properties, and fracture mechanisms of γ-TiAl workpieces. The dimensions of the workpiece are 12 mm × 12 mm × 5 mm; the results indicate that the roughness of γ-TiAl workpieces machined with UVAM is as low as 0.202 μm, which is an improvement of 40.76% compared to CM. The maximum compressive residual stress generated was 841.8 MPa, 91.8% higher than CM. Under identical loading conditions, UVAM TiAl alloy specimens exhibited a tensile strength of 547.39 MPa, 13% higher than CM TiAl alloy. The thickness of the fatigue specimens is 5 mm, at a maximum loading stress of 395 MPa, the maximum stress percentage for UVAM was 72.18%, while for CM, it was 83.02%. The fatigue life of ultrasonically milled specimens was 9303 cycles, a 63.44% improvement over CM. The study also analyzes the fatigue fracture mechanism, providing guidance for UVAM of γ-TiAl alloys.