Local Stress Analysis in an SMA during Stress-Induced Martensitic Transformation by Kossel Microdiffraction
The Kossel microdiffraction in a scanning electron microscope allows for local stress determination. This technique has been applied to monitor stress evolution within grains of austenite in the course of martensitic transformation in a shape memory alloy. Kossel diffraction patterns were recorded during in situ tensile straining of Cu-Al-Be alloy. These innovative measurements show large stress heterogeneities between grains, with the stress ratio exceeding two. As martensite variants are stress-induced, shear stress components appear in individual grains of austenite.
M. François, G. Montay, B. Panicaud, D. Retraint and E. Rouhaud
D. Bouscaud et al., "Local Stress Analysis in an SMA during Stress-Induced Martensitic Transformation by Kossel Microdiffraction", Advanced Materials Research, Vol. 996, pp. 45-51, 2014