MICROSTRUCTURAL AND TEXTURE STUDY IN Fe43.5Mn34Al15Ni7.5 SHAPE MEMORY ALLOY

Abstract

Fe alloy 43.5Mn34Al15Ni7.5 recently discovered, has pseudoplastic behavior in a wide temperature range. This characteristic is attractive for automobile, space, cryogenic and seismic applications. Currently there is no comprehensive analysis of the phases generated by heat treatments in the alloy and the influence of textures in shape memory properties. generated in the alloy with heat treatment and the influence of the textures on the properties of shape memory. The material studied was hot rolled at a temperature of 1000 ° C and then heat treated at different temperatures in order to analyse the phases present, microstructure and crystal orientations. The studies show that the martensitic phase (γ) is achieved with quenching in water at temperatures over 1200ºC. Furthermore, heat treatments above 1000ºC generate grain sizes in α phase close to a millimeter. This grains growth would improve pseudoelastic properties of the alloy.

Keywords

• pseudoelasticity
• phase transformation
• composition
• heat treatment