Scholarlink

<p>Additively manufactured (AM) titanium alloys exhibit heterogeneous microstructures and strong textures that influence mechanical performance, yet the role of crystallographic orientation remains incompletely quantified. Here, high-speed nanoindentation mapping is correlated with electron backscatter diffraction to resolve orientation-dependent hardness and reduced modulus in three laser-based directed energy deposited Ti alloys: Ti–6Al–2Zr–1Mo–1V (TA15), Ti–6.5Al–3.5Mo–1.5Zr–0.3Si (TC11), and Ti–10V–2Fe–3Al (TB6). The TA15 and TC11 alloys exhibit bimodal α-grain hardness distributions, whereas the TB6 alloy exhibits a unimodal β-grain response. Hardness and modulus increase continuously with <i>c</i>-axis alignment to the loading direction in the TA15 and TC11 alloys, with no measurable orientation dependence in the TB6 alloy. Orientation-induced hardness variations reach 28% in TA15 alloy and 39% in TC11 alloy, exceeding corresponding modulus changes (15% and 20%). These findings quantitatively link crystallographic texture to mechanical heterogeneity, informing microstructure-sensitive design strategies in AM Ti alloys.</p> Graphical abstract <p></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

High-speed nanoindentation mapping of additively manufactured α and β titanium alloys: Orientation-dependent mechanical properties at the microscale

  • 期刊论文

  • 发表日期：

    2026年7月1日

查看全文
  • Kate S. Hardman,
  • Zhiying Liu,
  • Soumya S. Dash,
  • Yu Zou

摘要

Additively manufactured (AM) titanium alloys exhibit heterogeneous microstructures and strong textures that influence mechanical performance, yet the role of crystallographic orientation remains incompletely quantified. Here, high-speed nanoindentation mapping is correlated with electron backscatter diffraction to resolve orientation-dependent hardness and reduced modulus in three laser-based directed energy deposited Ti alloys: Ti–6Al–2Zr–1Mo–1V (TA15), Ti–6.5Al–3.5Mo–1.5Zr–0.3Si (TC11), and Ti–10V–2Fe–3Al (TB6). The TA15 and TC11 alloys exhibit bimodal α-grain hardness distributions, whereas the TB6 alloy exhibits a unimodal β-grain response. Hardness and modulus increase continuously with c-axis alignment to the loading direction in the TA15 and TC11 alloys, with no measurable orientation dependence in the TB6 alloy. Orientation-induced hardness variations reach 28% in TA15 alloy and 39% in TC11 alloy, exceeding corresponding modulus changes (15% and 20%). These findings quantitatively link crystallographic texture to mechanical heterogeneity, informing microstructure-sensitive design strategies in AM Ti alloys.

Graphical abstract