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Transformation hysteresis and shape memory effect of an ultrafine-grained TiNiNb shape memory alloy
Affiliation:1. Center for Biomedical Materials and Engineering, Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China;2. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China;3. Ufa State Aviation Technical University, Ufa 450000, Russia;4. Institute of Molecule and Crystal Physics RAS, Ufa 450075, Russia;1. Institute of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Jiangsu 211106, China;2. School of Material Science and Engineering, Nanchang Hangkong University, Jiangxi 330063, China;3. School of Material Science and Engineering, Hunan University, Hunan 410082, China;1. Glass and Advanced Materials Division, Bhabha Atomic Research Centre, Mumbai 400085, India;2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;1. Key Laboratory of Superlight Material and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China;2. Center for Biomedical Materials and Engineering, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;3. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China;1. Department of Engineering Mechanics, Chongqing University, Chongqing 400044, China;2. Chongqing Key Laboratory of Heterogeneous Materials Mechanics, Chongqing University, Chongqing 400044, China;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;2. Guangdong University of Technology, Guangzhou, 510006, China
Abstract:In present work, transformation hysteresis and shape memory effect of an ultrafine-grained Ti44Ni47Nb9 alloy processed by ECAP were studied. After deformation, the ECAPed sample showed a much wider transformation hysteresis than the initial sample due to the enlarged strength mismatch between matrix and β-Nb phase. The shape memory effect and its cycling stability of the ECAPed sample were obviously improved.
Keywords:A  Shape–memory alloys  B  Martensitic transformation  B  Shape–memory effects  C  Severe plastic deformation
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