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<p>This study aims to fabricate a new type of titanium alloy composite with well-matched strength and plasticity. Two alloys, Ti6Al4V ELI and Ti-10V-2Fe-3Al, were selected for the preparation. The powders of Ti6Al4V ELI and Ti-10V-2Fe-3Al in equal mass ratio were mixed and transformed into billets by spark plasma sintering (SPS). Samples were machined from the billets and then underwent hot compression. Hot compressed specimens were finally subjected to solution plus aging treatment. Optical microscopy (OM), scanning electron microscopy (SEM), and electron backscattered diffraction (EBSD) methods were used for microstructure characterization. The results show that when the hot compression temperature is low, there are fine equiaxed <i>α</i> grains in the Ti6Al4V ELI zone. In the Ti-10V-2Fe-3Al region, there are large equiaxed <i>β</i> grains interspersed with acicular <i>α</i> phases. As the hot compression temperature increases, the dynamic recrystallization rate increases, resulting in coarse equiaxed <i>β</i> grains within the Ti-10V-2Fe-3Al zone. At the same time, within the Ti6Al4V ELI region, the equiaxial <i>α</i>-phase gradually disappears and is replaced by a fine, needle-like <i>α</i>-phase. Maintaining the solid-solution aging parameters constant, this microstructural evolution results in a certain increase in the composites’ strength, albeit with a significant decrease in plasticity. Therefore, to achieve a balance between strength and plasticity, the Ti6Al4V ELI region should be characterized by an equiaxial <i>α</i>-phase, while the Ti-10V-2Fe-3Al region should feature an acicular <i>α</i>-phase. The composite can achieve a tensile strength of 1423&#xa0;MPa with elongation of up to 6%. In addition, a room-temperature yield strength model was developed, with predictions made within a 10% error margin.</p>

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A Novel Composite Material by Sintering Ti6Al4V ELI and Ti-10V-2Fe-3Al Powders in an Equal Mass Ratio

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • Jinhao Xu,
  • Xiaohui Shi,
  • Zhiyuan Fan,
  • Zirui Chen,
  • Junwei Qiao

摘要

This study aims to fabricate a new type of titanium alloy composite with well-matched strength and plasticity. Two alloys, Ti6Al4V ELI and Ti-10V-2Fe-3Al, were selected for the preparation. The powders of Ti6Al4V ELI and Ti-10V-2Fe-3Al in equal mass ratio were mixed and transformed into billets by spark plasma sintering (SPS). Samples were machined from the billets and then underwent hot compression. Hot compressed specimens were finally subjected to solution plus aging treatment. Optical microscopy (OM), scanning electron microscopy (SEM), and electron backscattered diffraction (EBSD) methods were used for microstructure characterization. The results show that when the hot compression temperature is low, there are fine equiaxed α grains in the Ti6Al4V ELI zone. In the Ti-10V-2Fe-3Al region, there are large equiaxed β grains interspersed with acicular α phases. As the hot compression temperature increases, the dynamic recrystallization rate increases, resulting in coarse equiaxed β grains within the Ti-10V-2Fe-3Al zone. At the same time, within the Ti6Al4V ELI region, the equiaxial α-phase gradually disappears and is replaced by a fine, needle-like α-phase. Maintaining the solid-solution aging parameters constant, this microstructural evolution results in a certain increase in the composites’ strength, albeit with a significant decrease in plasticity. Therefore, to achieve a balance between strength and plasticity, the Ti6Al4V ELI region should be characterized by an equiaxial α-phase, while the Ti-10V-2Fe-3Al region should feature an acicular α-phase. The composite can achieve a tensile strength of 1423 MPa with elongation of up to 6%. In addition, a room-temperature yield strength model was developed, with predictions made within a 10% error margin.