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Characterization, thermomechanical behaviour and micromechanical-based constitutive model of shape-memory CuZnAl single crystals by C. Lexcellent; B.C. Goo; Q.P. Sun; J. Bernardini is a Engineering article available to read on EtoBox.

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Cu-Zn-Al shape memory alloys are grown as single crystals by the Bridgman technique with a final shape directly suitable for thermomechanical tests (cylinders with tapered heads: 25 mm gauge length, 4 mm in diameter). The four classical transformation temperatures are checked by Differential Scanning Calorimetry and resistivity. The orientation of crystal structure is investigated by X-ray diffraction. Isothermal pseudoelastic tensile tests show that the width of the hysteresis loops and the slope of the stress-strain curves during phase transformation increase as the applied stress rate increases. A micromechanical-based constitutive model allows us to describe this single crystal behaviour. Copyright $7 1996 Acta Metallurgica Inc. R&urn&Des monocristaux de Cu-Zn-Al sont Claborts par la technique de Bridgman avec une forme gtomttrique directement utilisable pour les essais thermomtcaniques (cylindre B t@te conique 25 mm de longueur utile et 4 mm de diamitre). Les quatre temptratures classiques de transformation sont obtenues par calorimktre diffkrentielle a balayage et risistivitl. L'orientation de la structure cristalline est obtenue au moyen de la diffraction par RX. Des essais

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Author

C. Lexcellent; B.C. Goo; Q.P. Sun; J. Bernardini

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1359-6454)

Published

1996

Language

EN

Field

Engineering (Physical Sciences)