Cryogenic-deformation-induced phase transformation in an FeCoCrNi high-entropy alloy

Materials Research Letters

Qingyun Lin¹  Xianghai An¹  Xiaozhou Liao¹  Hao Wang¹  Junpeng Liu²  Yong Zhang² 

[1]The University of Sydney

[2]University of Science and Technology Beijing

关键词: High-entropy alloy;    phase transformation;    cryogenic temperature;    shockley partial dislocations;   

DOI  :  10.1080/21663831.2018.1434250

来源: DOAJ

【 摘 要 】

An FeCoCrNi high-entropy alloy (HEA) was deformed at ambient temperature and cryogenic temperatures down to 4.2 K. Phase transformation from a face-centered cubic (FCC) structure to a hexagonal close-packed (HCP) structure occurred during cryogenic deformation. Lowering the temperature promotes the transformation. Atomic-scale structural characterisation suggested that the formation of the HCP structure was achieved via the glide of Shockley partial dislocations on every other $ {\{ 111\} _{{\rm FCC}}} $ plane. Due to the kinetic limitation, the occurrence of this transformation was limited even though theoretical investigations predicted lower free energy of the HCP phase than that of the FCC phase in the HEA.

【 授权许可】

Unknown