Phase transformation and microstructure evolution of the deformed Ti-30Zr-5Nb shape memory alloy
- Resource Type
- Authors
- Wentao Qu; Yan Li; Yong-Sheng Nie; Chengyang Xiong; Sun Xuguang; Bifei Yuan
- Source
- Materials Characterization. 126:81-85
- Subject
- 010302 applied physics
Materials science
Mechanical Engineering
Alloy
Metallurgy
Elastic energy
02 engineering and technology
Shape-memory alloy
engineering.material
021001 nanoscience & nanotechnology
Condensed Matter Physics
Microstructure
01 natural sciences
Mechanics of Materials
Diffusionless transformation
Martensite
0103 physical sciences
engineering
General Materials Science
Composite material
Deformation (engineering)
0210 nano-technology
Tensile testing
- Language
- ISSN
- 1044-5803
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.