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<p>Ensuring structural integrity in critical applications necessitates performance optimization of selective laser melted (SLM) TA15 alloys across room to elevated temperature regimes, demanding coordinated enhancement of their thermomechanical stability and microstructural reliability. This article demonstrated an SLM strategy for fabricating Y<sub>2</sub>O<sub>3</sub>-modified TA15 alloys with thermally adaptive mechanical properties. Systematic investigations reveal that bimodal Y<sub>2</sub>O<sub>3</sub> nanoparticles formed in TA15-<i>x</i>Y<sub>2</sub>O<sub>3</sub> alloy (primary Y<sub>2</sub>O<sub>3</sub>: formed during the liquid phase cooling; secondary Y<sub>2</sub>O<sub>3</sub>: precipitated from the α' and β phase, maintaining the orientation relationship of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\([100]_{\text{Y}_{2}\text{O}_3} // [2 \bar{1}\bar{1}0]_{\alpha}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mrow> <mo stretchy="false">[</mo> <mn>100</mn> <mo stretchy="false">]</mo> </mrow> <mrow> <msub> <mtext>Y</mtext> <mn>2</mn> </msub> <msub> <mtext>O</mtext> <mn>3</mn> </msub> </mrow> </msub> <mo stretchy="false">/</mo> <mo stretchy="false">/</mo> <msub> <mrow> <mo stretchy="false">[</mo> <mn>2</mn> <mover accent="true"> <mrow> <mn>1</mn> </mrow> <mrow> <mo stretchy="false">¯</mo> </mrow> </mover> <mover accent="true"> <mrow> <mn>1</mn> </mrow> <mrow> <mo stretchy="false">¯</mo> </mrow> </mover> <mn>0</mn> <mo stretchy="false">]</mo> </mrow> <mi>α</mi> </msub> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\((0\bar{4}0)_{\text{Y}_{2}\text{O}_{3}}//(0\bar{1}10)_{\alpha}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mrow> <mo stretchy="false">(</mo> <mn>0</mn> <mover accent="true"> <mrow> <mn>4</mn> </mrow> <mrow> <mo stretchy="false">¯</mo> </mrow> </mover> <mn>0</mn> <mo stretchy="false">)</mo> </mrow> <mrow> <msub> <mtext>Y</mtext> <mn>2</mn> </msub> <msub> <mtext>O</mtext> <mn>3</mn> </msub> </mrow> </msub> <mo stretchy="false">/</mo> <mo stretchy="false">/</mo> <msub> <mrow> <mo stretchy="false">(</mo> <mn>0</mn> <mover accent="true"> <mrow> <mn>1</mn> </mrow> <mrow> <mo stretchy="false">¯</mo> </mrow> </mover> <mn>10</mn> <mo stretchy="false">)</mo> </mrow> <mi>α</mi> </msub> </mrow> </math></EquationSource> </InlineEquation> with the matrix.), enabling α-lath refinement from 1.183 to 0.487&#xa0;μm through synergistic nucleation promotion and growth inhibition (Thermal cycling, annealing). At room temperature, 0.1 wt% Y<sub>2</sub>O<sub>3</sub> optimizes strength-plasticity balance (increased 14.7% ultimate tensile strength (UTS) to 1097&#xa0;MPa, increased 11.4% elongation (EL)) via grain refinement and dispersion strengthening. However, excessive Y<sub>2</sub>O<sub>3</sub> fragments β phase and induces α/β interfacial voids, yet paradoxically enhances high-temperature tensile strength by 18.5% (749&#xa0;MPa) through intensified dislocation-Y<sub>2</sub>O<sub>3</sub> interactions. This composition-dependent transition correlates with the improved by Y<sub>2</sub>O<sub>3</sub>-induced α, β-phase stabilization, establishing a dual-phase optimization paradigm for temperature-specific titanium alloy design.</p> Graphical abstract <p></p>

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Additive manufacturing of Y2O3-modified TA15 titanium alloy: enhanced mechanical properties at room and high temperatures

  • 期刊论文

  • 发表日期：

    2025年10月2日

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  • Lei Zhang,
  • Shuang Hu,
  • Ying-Fei Guo,
  • Tian-Xin Li,
  • Chao-Wen Huang,
  • Rui Ma,
  • Xian-Li Ren,
  • Ming-Pan Wan,
  • Xing Ran

摘要

Ensuring structural integrity in critical applications necessitates performance optimization of selective laser melted (SLM) TA15 alloys across room to elevated temperature regimes, demanding coordinated enhancement of their thermomechanical stability and microstructural reliability. This article demonstrated an SLM strategy for fabricating Y2O3-modified TA15 alloys with thermally adaptive mechanical properties. Systematic investigations reveal that bimodal Y2O3 nanoparticles formed in TA15-xY2O3 alloy (primary Y2O3: formed during the liquid phase cooling; secondary Y2O3: precipitated from the α' and β phase, maintaining the orientation relationship of \([100]_{\text{Y}_{2}\text{O}_3} // [2 \bar{1}\bar{1}0]_{\alpha}\) [ 100 ] Y 2 O 3 / / [ 2 1 ¯ 1 ¯ 0 ] α , \((0\bar{4}0)_{\text{Y}_{2}\text{O}_{3}}//(0\bar{1}10)_{\alpha}\) ( 0 4 ¯ 0 ) Y 2 O 3 / / ( 0 1 ¯ 10 ) α with the matrix.), enabling α-lath refinement from 1.183 to 0.487 μm through synergistic nucleation promotion and growth inhibition (Thermal cycling, annealing). At room temperature, 0.1 wt% Y2O3 optimizes strength-plasticity balance (increased 14.7% ultimate tensile strength (UTS) to 1097 MPa, increased 11.4% elongation (EL)) via grain refinement and dispersion strengthening. However, excessive Y2O3 fragments β phase and induces α/β interfacial voids, yet paradoxically enhances high-temperature tensile strength by 18.5% (749 MPa) through intensified dislocation-Y2O3 interactions. This composition-dependent transition correlates with the improved by Y2O3-induced α, β-phase stabilization, establishing a dual-phase optimization paradigm for temperature-specific titanium alloy design.

Graphical abstract