Multiple-stage transformation behavior of Ti49.2Ni50.8 alloy with different initial microstructure processed by equal channel angular pressing. (June 2017)

• Record Type: Journal Article
• Authors: Tong, Y.X.; Hu, K.P.; Chen, F.; Tian, B.; Li, L.; Zheng, Y.F.
• Is Part Of: Intermetallics. Volume 85(2017)
• Page Start: 163
• Page End: 169
• Publication Date: 2017-06
• Subjects: Shape-memory alloys -- Equal channel angular pressing -- Martensitic transformation -- Microstructure; Intermetallic compounds -- Metallography -- Periodicals; Metallic glasses -- Periodicals; Composés intermétalliques -- Métallographie -- Périodiques; 669.94
• DOI: 10.1016/j.intermet.2017.01.017
• Languages: English
• ISSNs: 0966-9795

Abstract

Abstract: Multiple-stage transformation of Ti49.2 Ni50.8 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. Highlights: Transformation sequence of as-ECAPed Ti49.2 Ni50.8 alloy depends on initial aging treatment. As-ECAPed alloy initially aged at 450 °C for 60 min shows three-stage transformation. Transformation sequence was discussed based on microstructure evolution.