Abstract
The dynamics of nucleation and growth of a thermoelastic martensite in a splat quenched Au-47.5 at.% Cd alloy has been studied utilizing electron microscopy. The high temperature CsCl type β-phase is retained at room temperature by splat quenching. A reversible martensite transformation has been induced in the electron transparent regions of the liquid quenched foils by varying the intensity of the illuminating electron beam while the foil was under observation in the electron microscope. This control over the transformation has permitted a study of the nature and types of martensite nucleation sites, as well as, the crystallography, morphology and growth mechanisms of the martensite embryos in this alloy. The nucleation of the 3 R martensite laths is heterogenous. The lath initially appears as a planar feature on a {110}β plane and rapidly increases in thickness until a wedge shape is achieved. Growth of the lath occurs by the propagation of this wedge into the β-phase. The screw dislocation-like nature of this wedge interface is discussed.
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