Optimization of alloy design and hot rolling conditions for shape memory in Fe-Mn-Si-based alloys

The effect of composition and hot rolling conditions on the shape memory effect (SME) in the Fe-Mn-Si-based system has been studied to obtain improved shape memory without the need to rely on training. It has been found that the texture is not markedly affected by rolling conditions, and texture is therefore not a major factor in explaining variations in SME with processing conditions. Decreasing the pre-deformation temperature to below the M-s was found to have a beneficial effect on shape memory. It was found that the best SME was achieved in an alloy that had M-s just above room temperature, and had been processed by hot rolling followed by recovery annealing. Alloys of different compositions exhibited different optimum rolling temperatures for maximum shape memory performance.