ω-like Diffraction Anomaly in the Premartensitic β1 Phase of AuCuZn2 Alloy

The present study by X-ray and neutron diffraction methods is concerned with the ω-like peak appearing at the positions (H±2/3, K±2/3, L±4/3) and (H±2/3, K±2/3, L∓4/3) in the reciprocal lattice of the quenched β 1 phase with the Heusler type structure of AuCuZn 2 . The obtained results indicate evidently that the ω-like peak is neither due to the ω phase formation as is the case of Zr alloy nor precursor phenomenon of the martensitic transformation