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- Title
Shape memory behavior of Ti-20Zr-10Nb-5Al alloy subjected to annealing treatment.
- Authors
Yu, Zhi-Guo; Xiong, Cheng-Yang; Xue, Peng-Fei; Li, Yan; Yuan, Bi-Fei; Qu, Wen-Tao
- Abstract
The effects of annealing temperature on microstructures, phase transformation, mechanical properties, and shape memory effect of Ti-20Zr-10Nb-5Al alloy were investigated. X-ray diffraction (XRD) patterns show that the alloy is composed of single hexagonal α′-martensite phase for both as-rolled sample and sample annealed at 773 K for 30 min, while single orthorhombic α″ phase exists in the samples annealed at 873 and 973 K for 30 min. The optical observations indicate that the alloy is recrystallized when annealed at 873 K, and the grain size of the sample annealed at 973 K is about five times larger than that annealed at 873 K. Both of the samples annealed at 873 and 973 K show almost the same reverse martensite transformation start temperature of 483 K as demonstrated by thermal dilatation tests. The critical stress values for martensite reorientation ( σ ) are 392 and 438 MPa for the alloys annealed at 873 and 973 K, respectively. The maximum shape memory strain is 2.8 %, which is obtained in the alloy annealed at 873 K due to the lower σ . Moreover, the sample annealed at 873 K exhibits larger tensile stress and tensile strain due to the smaller grain size.
- Publication
Rare Metals, 2016, Vol 35, Issue 11, p831
- ISSN
1001-0521
- Publication type
Article
- DOI
10.1007/s12598-016-0799-z