Abstract
The formation of bainite in a Au-47.5at%Cd alloy during isothermal aging above Af temperature was directly identified for the first time by in-situ TEM observation. Bainite forms in the form of thin plates with rapid initial growth and followed by a slower growth. The diffraction pattern of bainite showed 1/3 spots, being different from those of the γ 2 ' martensite of this alloy. This suggests that the structure of the bainite is different from the martensite. With DSC measurement, we found that the transformation temperatures of subsequent martensitic transformation decrease with increase of aging times; at prolonged aging time the DSC curve showed two peaks, corresponding to B2-γ 2 ', B2-ζ 2 ' martensitic transformation, respectively. These results indicates that bainite is depleted in Cd.
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