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Thermally and stress induced changes in three phase structure of Cu-Zn-Al-Fe shape memory alloy

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: L.G. Bujoreanu,M.L. Craus, S. Stanciu, V. Dia

Editorial: Mark Hull, Andrew Meredith, Susannah Kabel, Institute of Materials, Materials Science and Technology, 16, No 6, June,, p.612-616, 2000.


In order to explain the stabilised shape memory
behavior observed during the thermal and
mechanical cycling of a Cu-14.86Zn-5.8Al-0.5Fe
(wt.%) alloy, x-ray diffraction and optical
microscopy studies have been performed. The
former have shown that the previously reported
reorientation of the alpha brass phase
crystallites from alpha (111) to alpha (200),
observed during the heating up to 500 deg C, also
occurs duing a complete heating-cooling cycle up
to 325 deg C. Optical microscopy studies confirm
the increasing tendency for alpha phase preferred
formation when the temperature is increased from
325-500 deg C. This texturing effect that occurs
during thermal cycling is accompanied by an
increase in the amount of alpha phase with a
reduction in the amount of beta sub 2 austenite.
Finally, a tensile completely recoverable
pseudoelastic strain of approx0.6%, determined
during a loading-unloading cycle applied to a
heat treated specimen that contained no
austenite, has been ascribed to the reversible
formation of a specific martensite variant

Cuvinte cheie: ciclare mecanica si termica, aliaje cu memoria formei, reorientare cristalografica, efect de texturare // thermal and mechanical cycling, shape memory alloys, crystallographic reorientation, texturing effect