Martensitic Transformation in a Splat Cooled Metastable Au-47.5 at. % Cd Alloy

摘要

The effects of liquid quenching on the martensitic transformation of an Au-47.5 at. % Cd alloy are studied. A metastable beta phase is retained at room temperature after splat quenching. The electron diffraction pattern of this metastable phase shows diffuse (112) streaking. The x-ray supperlattice to fundamental line intensities are somewhat larger than the corresponding ratio for the bulk slow cooled samples (approximately 69C.). A reversible martensitic transformation can be induced in this metastable phase by increasing the beam intensity during the transmission electron microscopy. Extremely fine details of the martensitic plate nucleation and propagation during such a transformation cycle were recorded. (Author)