|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||High Entropy Alloys Based on NiCoFeAlxTiy Hardening with Multicomponent Intermetallic Nanoparticles
||Tao Yang, Chain Tsuan Liu
|On-Site Speaker (Planned)
||Chain Tsuan Liu
This paper summarizes our recent work on the study of microstructures and mechanical properties of high-entropy alloys (HEAs) based on NiCoFeAlxTiy. The precipitation of L12-type multi-component nanoparticles strongly enhances the strength of these HEAs at ambient and cryogenic temperatures. The tensile ductility of these HEAs depends on particle sizes, heat treatments, and alloy compositions. A careful control of the precipitation reaction results in a high tensile strength more than 1.5 GPa while still retaining an extraordinary tensile ductility of 50% at room temperature. On the other hand, these precipitation-hardened HEAs exhibit a serious of embrittlement at certain elevated temperatures. Our study reveals that the mid-temperature embrittlement can be alleviated by control of the precipitation reaction on grain boundaries. A brief discussion of the possible development of new high-temperature materials will be also discussed.