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Journal of Dental Research, Vol 64, 860-864, Copyright © 1985 by International & American Associations for Dental Research Online Journals

ARTICLES

Microstructures of duplex (beta + gamma) silver-tin alloys

J. R. Abbott, D. R. Miller and D. J. Netherway

The microstructures of (beta + gamma) silver-tin alloys are especially influenced by both homogenization temperature and subsequent heat treatment. When the alloy is cooled from homogenization temperatures above approximately 200 degrees C, lenticular regions of the ordered orthorhombic gamma phase precipitate from within the disordered h.c.p. beta phase on three structurally equivalent planes, (1210), (1120), and (2110), to form a Widmanstatten structure. When the duplex alloys were homogenized at temperatures below approximately 200 degrees C, where the beta/(beta + gamma) phase boundary is vertical, these structures were not observed.




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