Abstract
In the present research, the mechanism of the attack of mercury on γ-phase silver-tin amalgam alloy has been investigated by applying small drops of mercury to plastically deformed single crystals and polycrystalline specimens of the alloy and observing the progress of the reaction in a scanning electron-microscope. Preferential mercury attack leading to the formation of deep, planar intrusions was observed to occur along well defined crystal planes. Using electron channelling techniques and transmission electronmicroscopy, these were identified as being {010} slip planes and {011} and {211} deformation twins in the ordered orthorhombic γ-phase structure. In polycrystalline specimens, preferential grain boundary attack was also observed. Particularly aggressive reaction was found to occur at the intersection of twins and slip planes and at the points where deformation twins terminated on grain boundaries.
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