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Title: Phase transformation and microstructure evolution of the deformed Ti-30Zr-5Nb shape memory alloy

Abstract

The phase transformation and microstructures of the deformed Ti-30Zr-5Nb shape memory alloy were investigated. The X-ray diffraction measurements indicated that the Ti-30Zr-5Nb alloy was composed of a single orthorhombic α″-martensite phase. The alloy exhibited one yielding behavior in the tensile test, with a critical stress of ~ 600 MPa and a tensile strain of approximately 15%. A shape memory recovery accompanied by a permanent strain was exhibited in the deformed alloys when heated at 873 K. The permanent strain increased with increasing pre-strain. The microstructure evolution of the deformed alloy was investigated by transmission electron microscopy. The results showed that the martensite reorientation occurred and the dislocations were generated during deformation. The alloy displayed a reversible martensite transformation start temperature as high as 763 K. However, no strain-induced martensite stabilization was found in the deformed alloy with different pre-strain levels, potentially because the large chemical energy of the Ti-30Zr-5Nb alloy depressed the effects of the elastic energy and the dissipative energy. - Highlights: • Ti-30Zr-5Nb alloy is composed of single orthorhombic α″-martensite phase with M{sub s} of 721 K. • No martensite stabilization has been found in Ti-30Zr-5Nb alloy with different pre-strain. • Ti-30Zr-5Nb shows the maximum shape memory effectmore » of 2.75% with a pre-strain of 8%.« less

Authors:
 [1]; ;  [1];  [2];  [2];  [3]
  1. School of Mechanical Engineering, Xi'an Shiyou University, Xi'an 710065 (China)
  2. School of Materials Science and Engineering, Beihang University, Beijing 100191 (China)
  3. Lanzhou Seemine SMA Co. Ltd., Lanzhou 730010 (China)
Publication Date:
OSTI Identifier:
22689737
Resource Type:
Journal Article
Journal Name:
Materials Characterization
Additional Journal Information:
Journal Volume: 126; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1044-5803
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; DISLOCATIONS; MARTENSITE; MARTENSITIC STEELS; MICROSTRUCTURE; NIOBIUM ALLOYS; ORTHORHOMBIC LATTICES; PHASE TRANSFORMATIONS; SHAPE MEMORY EFFECT; STABILIZATION; STRAINS; TEMPERATURE RANGE 0400-1000 K; TITANIUM ALLOYS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; YIELDS; ZIRCONIUM ALLOYS

Citation Formats

Qu, Wentao, Sun, Xuguang, Yuan, Bifei, Xiong, Chengyang, Li, Yan, and Nie, Yongsheng. Phase transformation and microstructure evolution of the deformed Ti-30Zr-5Nb shape memory alloy. United States: N. p., 2017. Web. doi:10.1016/J.MATCHAR.2017.02.015.
Qu, Wentao, Sun, Xuguang, Yuan, Bifei, Xiong, Chengyang, Li, Yan, & Nie, Yongsheng. Phase transformation and microstructure evolution of the deformed Ti-30Zr-5Nb shape memory alloy. United States. https://doi.org/10.1016/J.MATCHAR.2017.02.015
Qu, Wentao, Sun, Xuguang, Yuan, Bifei, Xiong, Chengyang, Li, Yan, and Nie, Yongsheng. Sat . "Phase transformation and microstructure evolution of the deformed Ti-30Zr-5Nb shape memory alloy". United States. https://doi.org/10.1016/J.MATCHAR.2017.02.015.
@article{osti_22689737,
title = {Phase transformation and microstructure evolution of the deformed Ti-30Zr-5Nb shape memory alloy},
author = {Qu, Wentao and Sun, Xuguang and Yuan, Bifei and Xiong, Chengyang and Li, Yan and Nie, Yongsheng},
abstractNote = {The phase transformation and microstructures of the deformed Ti-30Zr-5Nb shape memory alloy were investigated. The X-ray diffraction measurements indicated that the Ti-30Zr-5Nb alloy was composed of a single orthorhombic α″-martensite phase. The alloy exhibited one yielding behavior in the tensile test, with a critical stress of ~ 600 MPa and a tensile strain of approximately 15%. A shape memory recovery accompanied by a permanent strain was exhibited in the deformed alloys when heated at 873 K. The permanent strain increased with increasing pre-strain. The microstructure evolution of the deformed alloy was investigated by transmission electron microscopy. The results showed that the martensite reorientation occurred and the dislocations were generated during deformation. The alloy displayed a reversible martensite transformation start temperature as high as 763 K. However, no strain-induced martensite stabilization was found in the deformed alloy with different pre-strain levels, potentially because the large chemical energy of the Ti-30Zr-5Nb alloy depressed the effects of the elastic energy and the dissipative energy. - Highlights: • Ti-30Zr-5Nb alloy is composed of single orthorhombic α″-martensite phase with M{sub s} of 721 K. • No martensite stabilization has been found in Ti-30Zr-5Nb alloy with different pre-strain. • Ti-30Zr-5Nb shows the maximum shape memory effect of 2.75% with a pre-strain of 8%.},
doi = {10.1016/J.MATCHAR.2017.02.015},
url = {https://www.osti.gov/biblio/22689737}, journal = {Materials Characterization},
issn = {1044-5803},
number = ,
volume = 126,
place = {United States},
year = {2017},
month = {4}
}