In Situ X-Ray Studies on New Cu-Al-Ag SMA with Martensitic Transformations Well Above 200 °C
Metallúrgia Física-Ciència de Materials, Dept. d'Enginyeria Química I Metallúrgia, Facultat de Química, Martí i Franquès 1, 08028 Barcelona, Spain
Cu-Al-Ag and Cu-Al-Ag-Co alloy s exhibit a martensitic transformation and the shape memory effect well above 200°C. This greatly extends the field of industrial applications for the shape memory alloys (SMA). The present work was carried out to study the martensitic transformation that takes place during heating. Samples were obtained by melting pure metals in an induction furnace under Ar controlled atmosphere. The samples were then cooled in a graphite crucible to room temperature. All the samples were homogeneized at 900°C for 12 hours and quenched in water at 100°C and held for 1 minute. They were, subsequently, cooled in water to room temperature. X-Ray diffraction patterns were recorded during heating for the different alloy compositions which allowed us to follow the in-situ the structural changes during heating.
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