Elastic Properties of AuCuZn₂ in the Martensitic Phase Transition

Abstract

The shear elastic constant \(\frac{1}{2}\)(C 11 –C 12 ) of AuCuZn 2 , whose mode is relevant to its martensitic transformation, has been directly measured as a function of temperature near the transformation temperature T M . It is found that the shear elastic constant takes on a positive temperature derivative, 6.2×10 -4 /deg, near T M . This value is not so large as the previously reported one, so the shear elastic constant does not seem to vanish near T M . The present values are in good accord with neutron diffraction data previously reported.