A study of electrical resistivity,internal friction and shear modulus on an aged Ti49Ni51 alloy |
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| Affiliation: | 1. Graduate Institute of Materials Engineering, National Taiwan University, Taipei, Taiwan 10764, Republic of China;2. Steel and Aluminum R&D Department, China Steel Corporation, Kaohsiung, Taiwan, 81233, Republic of China;1. Department of Surgery, University of Chicago, Chicago, IL;2. Department of Surgery, NorthShore University HealthSystem, Evanston, IL;3. Pritzker School of Medicine, University of Chicago, Chicago, IL;4. Center for Research Bioinformatics, NorthShore University HealthSystem, Evanston, IL;5. Department of Hematology & Oncology, NorthShore University HealthSystem, Evanston, IL;1. CIIDIT, UANL, Parque PIIT, Km. 10 autopista al Aeropuerto Internacional de Monterrey, Apodaca, N. L., CP 66600, México;2. FIME, UANL, Ciudad Universitaria, San Nicolás de los Garza, N. L., CP 66451, México;3. Universidade Federal de Campina Grande, Aprigio Veloso 882-Bodocongó, Campina Grande, Paraíba, CP 10069, Brasil;4. Universidade Federal de Pernambuco, Av. Acadêmico Hélio Ramos s/n, Cidade Universitaria, Recife-PE, Brasil;1. School of Life Science and Technology, Changchun University of Science and Technology, Changchun 130022, PR China;2. Clean Energy Technology Laboratory, Changchun University of Science and Technology, Changchun 130022, PR China;3. State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, PR China |
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| Abstract: | The 400°C aged Ti49Ni51 alloy can exhibit the transformation sequence of B2 →r premartensite R-phase →r martensite. In the early aging stage, only the premartensitic transformation is observed due to the Ms point being deeply depressed by the coherent stress of Ti11Ni14 precipitates. In the later aging stage, internal friction peaks associated with premartensitic and martensitic transformations are all observed on both heating and cooling. The sharp peaks associated premartensitic transformation on heating is believed to be related to the “bias” effect of the coherent stress induced by the Ti11Ni14 precipitates. The serrations of internal friction appearing significantly in the temperature around ?30 to ?80°C are found to be caused by the stress induced accomodation of R-phase or martensite variants, and are not associated with the transformation. The Ti11Ni14 precipitates can enhance the amount of martensite formed by unit of temperature or time during the martensitic transformation. |
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