WEB In situ characterization of the pseudoelasticity effect on Fe-Mn-Al-Ni-Ti single crystals with two different orientations
The pseudoelasticity of Fe-Mn-Al-Ni-Ti shape memory alloy was investigated by a combination of complementary in situ characterization techniques. Single crystals of two different crystallographic orientations were investigated under quasi-static tensile and compressive loading. The analysis of the stress-strain response was corroborated by full-field measurements of local strain and temperature fields using digital image correlation and thermography. Furthermore, kinetics of the underlying microstructural processes were studied using acoustic emission measurements. The stress-strain response of the two studied crystallographic orientations revealed clear differences both under tensile and compressive loading. Moreover, differences in the functional degradation were found. The combination of complementary in situ characterization methods resulted in a deeper understanding of stress-assisted martensitic phase transformation and microstructural process yielding functional degradation. The results were compared with results on single crystals of Fe-Mn-Al-Ni shape memory alloy.