Abstract
A commercial silver-tin dental alloy (Ag3Sn) has been rapidly quenched from the molten state in a controlled atmosphere “gun” splat quencher in order to obtain a chemically homogeneous structure and a fine grain size. The grain size obtained varies between 0.1 and 10 Μm. Microstructural features have been examined by scanning and transmission electron microscopy. In very thin regions of as-quenched foils there is considerable faulting, but in slightly thicker regions, quenched-in dislocation loops are observed. The thickest areas of splats show dendritic structures and a cooling rate of 107 Ks−1 can be estimated from the secondary dendrite arm spacings. Both X-ray and electron diffraction confirm that the crystal structure remains orthohombic after very rapid quenching. Preliminary results on the effect of small grain size on amalgamation properties are reported and compared with powders that have been produced commercially.
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