Novel as-cast AlCrFe₂Ni₂Ti_0.5 high-entropy alloy with excellent mechanical properties

Cheng-bin Wei¹，Xing-hao Du²，Yi-ping Lu¹，Hui Jiang³，Ting-ju Li¹，Tong-min Wang¹

1. Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology2. School of Materials Science and Engineering, Shenyang Aerospace University3. College of Mechanical and Electronic Engineering, Shandong University of Science and Technology

摘 要：We designed a novel Co-free AlCrFe₂Ni₂Ti_0.5 high-entropy alloy（HEA） that features an excellent combination of strength and ductility in this study. The as-cast AlCrFe₂Ni₂Ti_0.5 alloy showed equiaxed grains undergoing spinodal decomposition, which consisted of ultrafine-grained laminated body-centered cubic（bcc） phases and an ordered body-centered cubic（b2） phase, and some precipitates embedded in the b2 matrix. The bcc and b2 phases also feature a coherent interface. This unique structure impedes mobile dislocations and hinders the formation of cracks, thereby giving the AlCrFe₂Ni₂Ti_0.5 HEA both high strength and plasticity. At room temperature, the as-cast Al Cr Fe2 Ni2 Ti0.5 alloy exhibited a compressive yield strength of 1714 MPa, an ultimate strength of 3307 MPa, and an elongation of 43%. These mechanical properties are superior to those of most reported HEAs.

关键词：