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<p>TiAl alloys are extensively utilized in aerospace and automotive applications, attributed to their superior properties. Nevertheless, attaining an optimal balance between strength and plasticity at elevated temperatures remains a significant challenge. This research successfully developed TiAl matrix composites strengthened by high-entropy alloys (HEAs) using powder metallurgy techniques. The present study probed the effects of particular high-entropy alloys, such as AlMnCrFeNi, CoMnCrFeNi, and CoMoCrFeNi, on the microstructural traits and high-temperature mechanical performance of composite materials. The findings indicated that incorporating HEA particles substantially boosts the sintering process of TiAl alloys, which in turn aids in creating dense composites. All three types of HEA particles were evenly dispersed within the TiAl matrix and exhibited excellent interfacial bonding with the matrix. Notably, numerous fine AlMnCrFeNi and CoMnCrFeNi particles generated in their corresponding composites. Moreover, the high-temperature tensile strength and ductility of all composites were improved relative to the pure TiAl alloy, due to fewer defects, finer grains, and synergistic deformation. Among these, the TiAl composites reinforced with CoMoCrFeNi exhibited the most pronounced enhancement in mechanical performance.</p>

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Microstructure and High-Temperature Mechanical Properties of TiAl Matrix Composites Reinforced with Different Types of High-Entropy Alloy Particles

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Na Wu,
  • Xiaolei Song,
  • Yuechen Cai,
  • Xiaokai Li,
  • Hongyang Yang,
  • Jing Chen,
  • Zhenxin Duan,
  • Huiliang Shao

摘要

TiAl alloys are extensively utilized in aerospace and automotive applications, attributed to their superior properties. Nevertheless, attaining an optimal balance between strength and plasticity at elevated temperatures remains a significant challenge. This research successfully developed TiAl matrix composites strengthened by high-entropy alloys (HEAs) using powder metallurgy techniques. The present study probed the effects of particular high-entropy alloys, such as AlMnCrFeNi, CoMnCrFeNi, and CoMoCrFeNi, on the microstructural traits and high-temperature mechanical performance of composite materials. The findings indicated that incorporating HEA particles substantially boosts the sintering process of TiAl alloys, which in turn aids in creating dense composites. All three types of HEA particles were evenly dispersed within the TiAl matrix and exhibited excellent interfacial bonding with the matrix. Notably, numerous fine AlMnCrFeNi and CoMnCrFeNi particles generated in their corresponding composites. Moreover, the high-temperature tensile strength and ductility of all composites were improved relative to the pure TiAl alloy, due to fewer defects, finer grains, and synergistic deformation. Among these, the TiAl composites reinforced with CoMoCrFeNi exhibited the most pronounced enhancement in mechanical performance.