Texture evolution during thermomechanical treatments in Fe-Mn-Si shape memory alloys

A. DRUKER, C. SOBRERO, H.-G. BROKMEIER, J. MALARRÍA, R. BOLMARO

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

Elsevier

Año: 2008 vol. 481 p. 578 - 581

0921-5093

The texture evolution and shape memory behaviour was investigated in a Fe-30Mn-4Si alloy which undergoes the martensitic transformation ¥ã¡ê¥å. The alloy was subject to different rolling and annealing treatments, and specimens for mapping texture and shape memory effect were analyzed in each case. After hot-rolling at 1000¨¬C, and for high values of accumulated strain, typical FCC shear textures were observed for the austenitic phase. Further rolling at 600¨¬C leads to some texture reduction although the texture pattern remains unchanged. Alternatively, cold-rolling leads to stress-induced ¥å martensite and after annealing at 650¨¬C a simile FCC rolling texture was observed. Thus, different thermomechanical processes allow the development of quite different texture patterns that might be exploited for attaining novel shape memory responses. By means of the inverse pole figures the strongest orientations in the HCP phase were determined for stress-induced martensite either by cold-rolling or by tensile test. Shape recovery and yield stress was determined for the different specimens in order to analyze the role of texture and processing parameters on the shape memory effect.