Enhancing shape recoverable ratio in (Ni 50.1 Ti 34.9 Hf 15 ) 85 Nb 15 high-temperature shape memory alloy by thermal-mechanical treatments
Year: 2025
Type: article
Abstract: The low shape recoverable ratio in NiTiHf high-temperature shape memory alloys was mainly attributed to dislocation generation due to low matrix strength. This work proposes that dislocation generation is also a result of the high critical stress of martensite variant reorientation due to a large atomic mismatch at the twin boundary. Thus, the shape recoverable ratio can be improved by avoiding the reorientation of martensite variants by introducing parallel martensite variants along the external stress direction. Two thermal-mechanical treatments, cyclic deformation-recovery training and pre-deformation training, are applied with a shape recoverable ratio improved from 77% to 88.5% and 97.5%, respectively.
Source: Materials Research Letters
Authors: Ji Zhang, Zheng Xiang, Qin Yang, Qichao Fan, Shuke Huang, Jie Chen
Institution: China Academy of Engineering Physics
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,459
Awards: G3021932909, G3968784142
OpenAlex ID: W4408123313