INVESTIGADORES
SOBRERO cesar Enrique
congresos y reuniones científicas
Título:
An assessment of grain size effects on transformation temperatures and hysteresis in Cu-based SMA tapes obtained by melt spinning
Autor/es:
P. LA ROCA; L. ISOLA; C. SOBRERO; M. F. GIORDANA; A. ROATTA; PH. VERMAUT; J. A. MALARRÍA
Lugar:
Chicago
Reunión:
Congreso; International conference on martensitic transformations - ICOMAT 2017; 2017
Resumen:
We systematically studied the grain size, d, dependence of the shift in transformation temperatures and the widening of the hysteresis inpolycrystalline Cu-based shape memory alloy tapes obtained by melt-spinning.Within a phenomenological thermodynamic framework, we analyze changes inthe difference in Gibbs free energy between the martensite and the parentphase, which result from contributions of martensite-martensite interface energy,stored elastic energy, and dissipative effects produced by internalfriction between mobile interfaces and grain boundaries. Experimental results (Ms vs d, and Hys vs d) are adequately fitted by functions of the characteristicgrain size of the specimens, over the range of ~100 µm to ~ 1 µm