Scholarlink

<p>The influence of annealing treatment schedules on the microstructure and mechanical properties of a near-<i>β</i> Ti-17 alloy was investigated in this study. Water-cooled specimens exhibit rapid growth of uniformly distributed <i>β</i> grains, accompanied by a simultaneous decline in both strength and ductility as heating time increases. In contrast, air-cooled alloys retain fine <i>α</i>-phase precipitates, which introduce additional interfaces that effectively hinder dislocation motion, leading to higher strength but reduced plasticity. In particular, the air-cooled specimen (AC-10) achieves an exceptional combination of ultra-high tensile strength (1262.9&#xa0;MPa) and good ductility (9.7%). Fractographic analysis reveals a ductile fracture mode with micro-voids distributed within the <i>β</i> matrix, <i>α</i>-phase, and <i>α</i>/<i>β</i> interfaces, along with intergranular cracking at <i>β</i> grain boundaries. This suggests that plastic deformation occurs within the grains, yet the primary reason for failure stems from inadequate interfacial strength at the grain boundaries. Additionally, the strengthening mechanisms of the Ti-17 alloy have been analyzed, highlighting the contributions of grain boundary strengthening and precipitation strengthening. These findings provide valuable insights for optimizing heat treatment processes to achieve tailored mechanical properties in near-<i>β</i> titanium alloys.</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

Effect of Annealing Schedules on Microstructure and Mechanical Behavior of a Near-β Titanium Alloy

  • 期刊论文

  • 发表日期：

    2025年7月14日

查看全文
  • Jiao Tan,
  • Xiangyun Bao

摘要

The influence of annealing treatment schedules on the microstructure and mechanical properties of a near-β Ti-17 alloy was investigated in this study. Water-cooled specimens exhibit rapid growth of uniformly distributed β grains, accompanied by a simultaneous decline in both strength and ductility as heating time increases. In contrast, air-cooled alloys retain fine α-phase precipitates, which introduce additional interfaces that effectively hinder dislocation motion, leading to higher strength but reduced plasticity. In particular, the air-cooled specimen (AC-10) achieves an exceptional combination of ultra-high tensile strength (1262.9 MPa) and good ductility (9.7%). Fractographic analysis reveals a ductile fracture mode with micro-voids distributed within the β matrix, α-phase, and α/β interfaces, along with intergranular cracking at β grain boundaries. This suggests that plastic deformation occurs within the grains, yet the primary reason for failure stems from inadequate interfacial strength at the grain boundaries. Additionally, the strengthening mechanisms of the Ti-17 alloy have been analyzed, highlighting the contributions of grain boundary strengthening and precipitation strengthening. These findings provide valuable insights for optimizing heat treatment processes to achieve tailored mechanical properties in near-β titanium alloys.