Influence of Nb content on martensitic transformation and mechanical properties of TiNiCuNb shape memory alloys |
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| Affiliation: | 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;4. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;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 |
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| Abstract: | In present work, microstructure, martensitic transformation behavior and mechanical properties of (Ti50Ni40Cu10)100−xNbx (x = 0, 5, 10, 15 at.%) alloys were investigated as a function of Nb content. The addition of Nb to TiNiCu alloy leads to the presence of β-Nb phase. During cooling and heating, the alloys show one-step B2 ↔ B19 transformation. As the Nb content increases, the transformation temperatures almost linearly decrease and the transformation hysteresis monotonously increases due to the decrease of middle eigenvalue of the phase transformation matrix. The addition of Nb is effective in improving the elongation because of the introduction of β-Nb phase. With the increase of Nb content, both the yield strength and the critical stress to induce martensitic transformation increase, resulting in the improved superelastic strain. |
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| Keywords: | Shape-memory alloys Martensitic transformation Mechanical properties Shape-memory effects Microstructure |
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