Artículos de revistas
Grain size evolution in Cu-based shape memory alloys
Fecha
2015-06Registro en:
Montecinos Espinoza, Susana de Los Angeles; Cuniberti, Adela Maria; Romero, Jose Ricardo; Stipcich, Marcelo Fernando; Grain size evolution in Cu-based shape memory alloys; Springer; Journal of Materials Science; 50; 11; 6-2015; 3994-4002
0022-2461
CONICET Digital
CONICET
Autor
Montecinos Espinoza, Susana de Los Angeles
Cuniberti, Adela Maria
Romero, Jose Ricardo
Stipcich, Marcelo Fernando
Resumen
A study of the grain growth kinetics in two shape memory alloys, CuAlBe and CuZnAl, is reported. Isothermal aging treatments at temperatures between 1023 and 1123 K were conducted, determining the grain size distribution as a function of time. The results show that the size distribution can be described by a log-normal type relationship, and is time-invariant. It was found that the arithmetic mean grain size almost coincide with the mode, which means that it is a representative parameter of the microstructure along the annealing time. The growth kinetics is strongly dependent on the aging temperature in CuZnAl, while is weakly in CuAlBe. It was verified that the grain size-time power law usually applied is not appropriate to describe the process, and an early departure from the ideal behavior is observed. The modification with a time-dependent dragging force gives a reasonable approximation to the grain growth kinetic. The obtained results are compared with the scarce data existing on this type of alloys.