<p>TC11 titanium alloy printed by selective laser melting (SLM) technology has excellent specific strength and has broad application prospects in many fields. This article explores the correlation mechanism between the dynamic compression mechanical behavior and building direction of SLM TC11 titanium alloy through dynamic compression experiments. The deformation mechanism of SLM TC11 titanium alloy under dynamic loading is explored by studying dislocation slip and twinning. The research results show that SLM TC11 titanium alloy exhibits significant strain-rate strengthening effects and strong macroscopic isotropy during dynamic compression. There exists competition between thermal softening and strain hardening. The <InlineEquation ID="IEq1"> <EquationSource Format="TEX">${>} 11\overline{2}0 {>}_{\alpha }$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>></mo> <mn>11</mn> <mover> <mn>2</mn> <mo>¯</mo> </mover> <mn>0</mn> <msub> <mo>></mo> <mi>α</mi> </msub> </mrow> </math></EquationSource> </InlineEquation> fiber texture in SLM TC11 titanium alloy is prone to induce more <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$\left\{ {10\overline{1}2} \right\}_{\alpha }$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mfenced close="}" open="{"> <mrow> <mn>10</mn> <mover> <mn>1</mn> <mo>¯</mo> </mover> <mn>2</mn> </mrow> </mfenced> <mi>α</mi> </msub> </math></EquationSource> </InlineEquation> extension twinning in vertically deposited specimens. SLM TC11 titanium alloy mainly activates slip systems to generate deformation, and twinning is only an auxiliary mechanism for dislocation slip. Higher strain-rate loading will activate more basal slip and pyramidal slip systems, and the <InlineEquation ID="IEq3"> <EquationSource Format="TEX">${>} 11\overline{2}0 {>}_{\alpha }$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>></mo> <mn>11</mn> <mover> <mn>2</mn> <mo>¯</mo> </mover> <mn>0</mn> <msub> <mo>></mo> <mi>α</mi> </msub> </mrow> </math></EquationSource> </InlineEquation> fiber texture can lead to slip tendency, thereby generating anisotropy. However, during the continuous deformation stage, the texture-induced “hard orientation” slip system (pyramidal) is largely activated, and the influence of <InlineEquation ID="IEq4"> <EquationSource Format="TEX">${>} 11\overline{2}0 {>}_{\alpha }$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>></mo> <mn>11</mn> <mover> <mn>2</mn> <mo>¯</mo> </mover> <mn>0</mn> <msub> <mo>></mo> <mi>α</mi> </msub> </mrow> </math></EquationSource> </InlineEquation> fiber texture on the deformation process may be limited to the initial stage.</p>

The Correlation Mechanism between Microstructure and Dynamic Compression Mechanical Behavior of Selectively Laser-Melted TC11 Titanium Alloy

期刊论文
发表日期：

2026年2月24日

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Ye Xiao-Jun,
Zhao Peng-Long,
Fu Yan-Shu,
Xiao Xian-Feng,
Song Xin-Hua

摘要

TC11 titanium alloy printed by selective laser melting (SLM) technology has excellent specific strength and has broad application prospects in many fields. This article explores the correlation mechanism between the dynamic compression mechanical behavior and building direction of SLM TC11 titanium alloy through dynamic compression experiments. The deformation mechanism of SLM TC11 titanium alloy under dynamic loading is explored by studying dislocation slip and twinning. The research results show that SLM TC11 titanium alloy exhibits significant strain-rate strengthening effects and strong macroscopic isotropy during dynamic compression. There exists competition between thermal softening and strain hardening. The ${>} 11\overline{2}0 {>}_{\alpha }$ $> 11 \bar{2} 0 >_{α}$ fiber texture in SLM TC11 titanium alloy is prone to induce more $\left\{ {10\overline{1}2} \right\}_{\alpha }$ ${\{10 \bar{1} 2\}}_{α}$ extension twinning in vertically deposited specimens. SLM TC11 titanium alloy mainly activates slip systems to generate deformation, and twinning is only an auxiliary mechanism for dislocation slip. Higher strain-rate loading will activate more basal slip and pyramidal slip systems, and the ${>} 11\overline{2}0 {>}_{\alpha }$ $> 11 \bar{2} 0 >_{α}$ fiber texture can lead to slip tendency, thereby generating anisotropy. However, during the continuous deformation stage, the texture-induced “hard orientation” slip system (pyramidal) is largely activated, and the influence of ${>} 11\overline{2}0 {>}_{\alpha }$ $> 11 \bar{2} 0 >_{α}$ fiber texture on the deformation process may be limited to the initial stage.