Multiple-stage transformation behavior of Ti49.2Ni50.8 alloy with different initial microstructure processed by equal channel angular pressing |
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| Affiliation: | 1. Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44 bus 2450, Leuven B3001, Belgium;2. Departament de Física, Universitat de les Illes Balears, Cra Valldemossa km 7.5, Palma de Mallorca E07122, Spain;3. ITMO University, Kronverkskiy av. 49, St. Petersburg 197101, Russia;1. Surface Engineering Division, Council of Scientific and Industrial Research—National Aerospace Laboratories, Post Bag No. 1779, Bangalore, 560017 Karnataka, India;2. Department of Chemistry, National Institute of Technology, Calicut, 673601 Kerala, India;3. Materials Science Division, Council of Scientific and Industrial Research—National Aerospace Laboratories, Post Bag No. 1779, Bangalore, 560017 Karnataka, India |
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| Abstract: | Multiple-stage transformation of Ti49.2Ni50.8 alloy processed by equal channel angular pressing (ECAP) was investigated as a function of pass number and aging treatment before ECAP. When the pass number is no more than four passes, three stage transformation, namely A→R, R1→M1 and R2→M2, occurs in the as-ECAP processed alloy initially aged at 450 °C for 60 min. Only the A→R→M forward transformation occurs provided that the aging duration was decreased/increased to 10/600min. The transformation sequence was discussed based on the microstructure evolution of as-ECAP processed alloy with different initial microstructure and pass number. |
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| Keywords: | Shape-memory alloys Equal channel angular pressing Martensitic transformation Microstructure |
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