Journal
CONTINUUM MECHANICS AND THERMODYNAMICS
Volume 24, Issue 2, Pages 149-164Publisher
SPRINGER
DOI: 10.1007/s00161-011-0222-9
Keywords
Microstructure; Martensitic phase transformation; Shape memory alloys (SMA); Energy minimization
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Funding
- Ministry of Science and Higher Education in Poland [N N501 071935]
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A systematic study of a specific martensitic microstructure, called the X-microstructure, is carried out with the focus on the CuAlNi shape memory alloy undergoing the cubic-to-orthorhombic transformation. The set of all crystallographically distinct candidate X-microstructures is determined, and it is shown that, according to the crystallographic theory of martensite, none of them is compatible. Almost compatible X-microstructures, which involve elastic strains, are thus examined. These microstructures are searched in the neighborhood of all candidate X-microstructures by minimizing the total elastic strain energy with respect to the microstructure parameters. Several low-energy X-microstructures are found, and it is shown that the total elastic strain energy correlates reasonably well with one of the indicators which characterize incompatibility of the corresponding candidate X-microstructure.
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