Transformation behavior of a Ti-47Ni-3Cu alloy heat treated under temperature gradient
- Authors
- Kim, Hyun-Gon; Kim, Han-Seong; Choi, Eunsoo; Cho, Baik-Soon; Chung, Young-Soo; Nam, Tae-Hyun
- Issue Date
- Dec-2007
- Publisher
- IOP PUBLISHING LTD
- Citation
- PHYSICA SCRIPTA, v.T129, pp.236 - 239
- Journal Title
- PHYSICA SCRIPTA
- Volume
- T129
- Start Page
- 236
- End Page
- 239
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/23514
- DOI
- 10.1088/0031-8949/2007/T129/053
- ISSN
- 0031-8949
- Abstract
- Transformation behavior and shape memory characteristics of temperature gradient anneal (TGA) treated and thermo-mechanically treated (TMT) Ti-47Ni-3Cu(at.%) alloys were investigated by means of differential scanning calorimetry and thermal cycling tests under constant load. Both TGA treated and TMT Ti-47Ni-3Cu alloys showed B2-B19' transformation behavior. The change in M-s* by 23K was developed in the TGA treated Ti-47Ni-3Cu alloy along the length of the sample (150 mm). TGA treated Ti-47Ni-3Cu alloy showed perfect shape memory effects. The temperature dependence of elongation (d epsilon/dT) of a TGA treated specimen was in the range of 0.02-0.09% K-1 depending on the amount of applied stress, which was small compared to that of a TMT specimen (0.01-0.18% K-1). The temperature dependence of elongation (d epsilon/dT) of the TGA treated specimen on cooling is almost the same as that on heating, while d epsilon/dT of the TMT specimen on cooling is much smaller than that on heating (0.68% K-1).
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