|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||Precipitation Strengthening Effects in Powder Metallurgical High Entropy Alloys
||Yong Liu, Bin Liu, Qihong Fang, C.T. Liu
|On-Site Speaker (Planned)
Powder metallurgy becomes more and more important in processing high entropy alloys (HEAs). Through casting, inhomogeneous and coarse microstructures usually are unavoidable, because HEAs usually contain complex alloying elements. The presentation introduced our recently progress in processing HEAs with interstitial and heavy elements. FeCoCrNiAl0.5 HEA was alloyed with different amount of carbon and Mo. HEA powders prepared by the gas atomization method were hot extruded and heat treated, and long HEA bars with very homogeneous microstructures were obtained. Both the precipitation of carbides and intermetallic phases were investigated by using high resolution TEM. The results indicated that HEAs have high tensile strength and reasonable ductility, and both properties can be flexibly adjusted by controlling the precipitation process. Finally, the mechanism of microstructural evolution and the plastic deformation were discussed. In general, powder metallurgy can be considered as a promising way for preparing large-sized HEAs with high mechanical properties.
||Planned: Supplemental Proceedings volume