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Texture evolution during thermomechanical treatments in Fe-Mn-Si shape memory alloys
A. DRUKER, C. SOBRERO, J. MALARRÍA, R. BOLMARO
Conferencia; 7th European Symposium on Martensitic Transformations and Shape Memory Alloys; 2006
Texture evolution and shape memory behaviour were investigated in an Fe-30Mn-4Si alloy showing the FCC to HCP martensitic transformation. The alloy was subjected to different rolling and annealing treatments. Texture mapping and shape memory effect were performed in each case. After hot-rolling at 1000C, and for high values of accumulated strain, typical FCC shear textures were observed for the austenitic phase. Further rolling at 600C leads to some texture reduction although the texture pattern remains unchanged. Alternatively, cold-rolling leads to stress-induced HCP martensite and, after annealing at 650C, a similar FCC rolling texture was observed. Consequently, different thermomechanical processes allow the development of quite different texture patterns that might be exploited for attaining novel shape memory responses. Shape recovery and yield stress were measured for the different specimens to analyze the role of texture and processing parameters on the shape memory effect.