Microstructure Evolution and Mechanical Properties of a TiAl Alloy Modified by High-Entropy Alloy Additions

作者：Hu, Qiang; Wang, Qiang^*; Wu, Xinling; Zeng, Liangcai; Liu, Xinwang

来源：JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, 2023, 32(20): 9121-9136.

DOI：10.1007/s11665-022-07782-5

• high-entropy alloy
• mechanical properties
• microstructure
• strengthening mechanism
• TiAl alloy

In this work, the microstructures and mechanical properties of an as-cast TiAl alloy were modified by CrMnFeCoNi high-entropy alloy (HEA) additions. The experimental results revealed that the HEA additions led to the formation of B2, L1(2) and A1 phases precipitated from (alpha(2) + gamma) lamellae. With 15 and 20 wt.% HEA additions, the precipitated phases constructed a network frame within the lamellar structure. We observed significant improvements in the strength and ductility of the HEA-containing TiAl alloy, which were mainly attributed to the occurrence of the twinning-controlled plastic deformation and the strengthening effect of the network frame. Moreover, two crack propagation paths existed on the fracture surface of the HEA-containing TiAl alloy.

• 单位
  华中科技大学