Stress-induced reverse martensitic transformation in a Ti-51Ni (at%) alloy aged under uniaxial stress

Fei Xiao; Hong Chen; Xuejun Jin; Zhihua Nie; Tomoyuki Kakeshita; Takashi Fukuda

doi:10.1038/s41598-018-24411-1

Stress-induced reverse martensitic transformation in a Ti-51Ni (at%) alloy aged under uniaxial stress

Sci Rep. 2018 Apr 17;8(1):6099. doi: 10.1038/s41598-018-24411-1.

Authors

Fei Xiao^{1

2}, Hong Chen¹, Xuejun Jin^{3

4}, Zhihua Nie⁵, Tomoyuki Kakeshita², Takashi Fukuda⁶

Affiliations

¹ State Key Lab of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, P. R. China.
² Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka, 565-0871, Japan.
³ State Key Lab of Metal Matrix Composite, School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Road, Shanghai, 200240, P. R. China. [email protected].
⁴ Institute of Advanced Steels and Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People's Republic of China. [email protected].
⁵ School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, China. [email protected].
⁶ Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka, 565-0871, Japan. [email protected].

Abstract

Ti-51Ni (at%) alloys including coherent precipitates of Ti₃Ni₄ exhibits thermally-induced B2-R transformation. If the Ti₃Ni₄ is formed under tensile stress, it orientates preferentially so that its habit plane becomes perpendicular to the tensile axis. In such specimens, stress-induced reverse R-B2 transformation is reported to occur. In the present study, the stress-induced reverse R-B2 transformation behavior was studied by infrared camera and in situ X-ray analysis. The infrared camera observation revealed that the temperature of the specimen decreases homogeneously by the application of tensile stress within the resolution of the camera. The in situ X-ray analysis revealed that stress-induced reverse R-B2 transformation and rearrangement of variants of the R-phase occurs simultaneously in the specimen.