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      Microstructural evolution in a Ti – Ta high-temperature shape memory alloy during creep

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          Abstract

          Alloys based on the titanium–tantalum system are considered for application as high-temperature shape memory alloys due to their martensite start temperatures, which can surpass 200 °C. In the present work we study the evolution of microstructure and the influence of creep on the phase transformation behavior of a Ti 70Ta 30 (at.%) high-temperature shape memory alloy. Creep tests were performed in a temperature range from 470 to 530 °C at stresses between 90 and 150 MPa. The activation energy for creep was found to be 307 kJ mol −1 and the stress exponent n was determined as 3.7. Scanning and transmission electron microscopy investigations were carried out to characterize the microstructure before and after creep. It was found that the microstructural evolution during creep suppresses subsequent martensitic phase transformations.

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          Microstructural evolution in a Ti – Ta high-temperature shape memory alloy during creep

           Ramona Rynko (corresponding) ,  Axel Marquardt,  Alexander Paulsen (2015)
          Alloys based on the titanium–tantalum system are considered for application as high-temperature shape memory alloys due to their martensite start temperatures, which can surpass 200 °C. In the present work we study the evolution of microstructure and the influence of creep on the phase transformation behavior of a Ti 70 Ta 30 (at.%) high-temperature shape memory alloy. Creep tests were performed in a temperature range from 470 to 530 °C at stresses between 90 and 150 MPa. The activation energy for creep was found to be 307 kJ mol −1 and the stress exponent n was determined as 3.7. Scanning and transmission electron microscopy investigations were carried out to characterize the microstructure before and after creep. It was found that the microstructural evolution during creep suppresses subsequent martensitic phase transformations.
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            Author and article information

            Journal
            ijmr
            International Journal of Materials Research
            Carl Hanser Verlag
            1862-5282
            2195-8556
            14 April 2015
            : 106
            : 4
            : 331-341
            Affiliations
            1 Institute for Materials, Ruhr-University Bochum, Germany
            Author notes
            [* ] Correspondence address, Ramona Rynko, M. Sc., Lehrstuhl Werkstoffwissenschaft, Institut für Werkstoffe, Fakultät für Maschinenbau, Ruhr-Universität Bochum, Universitätsstrasse 150, 44801 Bochum, Germany, Tel.: +49(0)234-32-27898, E-mail: ramona.rynko@ 123456rub.de
            Article
            MK111189
            10.3139/146.111189
            © 2015, Carl Hanser Verlag, München
            Page count
            References: 44, Pages: 11
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