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Автор F Falk
Автор P Konopka
Дата выпуска 1990-01-08
dc.description In shape-memory alloys a first-order martensitic phase transition is responsible for pseudo-elastic and for ferro-elastic stress-strain relations. To describe this behaviour a modified Landau theory is proposed in which the free energy of the crystal depends on the temperature and on the full strain tensor. The energy is invariant with respect to the cubic point group O<sub>h</sub> of the high-temperature phase. To predict the cubic-to-monoclinic phase transition of beta -phase shape-memory alloys an expansion up to sixth order in strain is necessary for which, for the class of alloys considered, odd terms may be neglected. For a CuAlNi alloy the expansion coefficients are determined by comparison with experimental results. In contrast to classical Landau theory of second-order phase transitions, not only a single second-order but also a fourth-order expansion coefficient depend on temperature.
Формат application.pdf
Издатель Institute of Physics Publishing
Название Three-dimensional Landau theory describing the martensitic phase transformation of shape-memory alloys
Тип paper
DOI 10.1088/0953-8984/2/1/005
Electronic ISSN 1361-648X
Print ISSN 0953-8984
Журнал Journal of Physics: Condensed Matter
Том 2
Первая страница 61
Последняя страница 77
Аффилиация F Falk; FB Phys., Univ.-GH-Paderborn, West Germany
Аффилиация P Konopka; FB Phys., Univ.-GH-Paderborn, West Germany
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