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“Yield” surfaces of shape memory alloys and their applications

✍ Scribed by W. Huang

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
200 KB
Volume
47
Category
Article
ISSN
1359-6454

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✦ Synopsis

AbstractÐThe yield'' (transformation start stress in stress induced martensitic transformation) surfaces of shape memory alloys (SMAs) are investigated. It is assumed that the driving energy (or driving force) for phase transformation is approximately a constant. By using the lattice structure and correspondence of a SMA in phase transformation, the yield'' surfaces of the following polycrystalline SMAs are calculated: NiTi, NiAl, CuZnGa, and CuAlNi. It is also found that all these yield'' surfaces can be described roughly by a general formula. In this formula, the parameters can be decided by using the yield'' stresses of a particular SMA in uni-axial tension and compression. The yield'' surface of NiTi is compared with the experimental results reported in the literature. The possibility of applying such a yield'' surface in predicting the behavior of a SMA under other stress conditions based on the tensile result is also studied.

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