Cu-based shape memory strips elaborated by one-step rapid solidification techniques: structural and functional properties

J. MALARRÍA, P. LA ROCA, PH. VERMAUT, P.OCHIN, R. PORTIER

Río de Janeiro (Brasil)

Conferencia; 11th Internacional Conference on Advanced Materials - ICAM 2009; 2009

International Union of Materials Research Societies (IUMRS)

Rapid solidification techniques are particularly useful for certain Cu-based alloys for which shaping is difficult because of their inherent lack of ductility. Applied to shape memory alloys, the Twin Roll Casting and Planar Flow Casting techniques allow to obtain in one step materials with forms suitable for practical applications (as ribbons and strips) with reduced grain size. Optimum conditions in processing parameters such as roll speed, melt temperature, melt flow, ejection pressure were established to obtain thin foils that are not brittle, with a smooth surface and free of cracks and holes. Martensitic transformation temperatures, phase stability and shape memory properties will be examined in relation with the microstructures developed by this techniques and specific thermal treatments.