Abstract
The CuZn alloys and their derivative CuZnAl have been extensively studied because of their reverse thermoelastic martensitic transformation which leads to shape memory devices. This displacive, diffusionless phenomenon is explained in terms of shear systems. Various models attempt to describe the B2(CsCl type)-9 R transformation. In order to contribute to this controversy the authors investigate CuZn alloys using X-ray absorption spectroscopy as a technique able to follow the changes of local atomic order during martensitic transformation. Investigations start from room temperature down to -231 degrees C. The martensitic transformation starts at -90 degrees C for this alloy. Premartensitic effects have often been reported at room temperature, and the Cu and Zn sets of data are consistent with a crystal deformation coherent with homogeneous sets of strains within two (110)-type BCC planes separated by 60 degrees along (110) directions.
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