中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 33 No. 5 May 2023 |
（1. Fujian Key Laboratory of Materials Genome, College of Materials, Xiamen University, Xiamen 361005, China;
2. Shenzhen Research Institute of Xiamen University, Shenzhen 518000, China;
3. School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China;
4. Institute for Advanced Studies in Precision Materials, Yantai University, Yantai 264005, China）
Abstract:The Cu-13.5Al-4Ni-6Fe centimeter-leveled martensite single crystals with full shape memory effect were prepared through simply annealing the cast alloy. The microstructure, reversible martensitic transformation, shape memory effect of this single crystal were investigated using optical microscopy, transmission electron microscope, differential scanning calorimeter, thermal mechanical analysis and compression test. The results show that Cu-13.5Al-4Ni-6Fe single crystal consists of 18R and 2H martensite, as well as rich-Fe bcc nanoprecipitate. The starting temperatures and the finishing temperatures of the forward and reverse martensitic transformations are 387, 397, 365 and 432 K, respectively. When the pre-strain is 6%, 7%, and 8%, this single crystal exhibits full shape memory effect of 4.4%, 4.7% and 5.2%, respectively. The obtained Cu-13.5Al-4Ni-6Fe martensite single crystal possesses shape memory properties that can be comparable to those of traditional shape memory alloys.
Key words: Cu-Al-Ni alloy; martensite single crystal; full shape memory effect; martensitic transformation; nanoprecipitate
