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The structures and transformations which occur in the silver-zinc alloys of around 50 at. per cent composition are reviewed. The crystallographic relations in the 8' and 4 phases are examined. It is shown that the @' + 5 transformation may be brought about by an interchange of nearest neighbour silver and zinc atoms in order to produce certain (112) planes containing only zinc atoms. A movement corresponding to a shear in the [lli] direction of rows of adjacent zinc atoms in these planes completes the transformation. The mechanism gives a simple explanation of the partial order of the 5 phase found by other workers and also gives an explanation for the structures of the anti-phase domains which occur in the /3 + 5 transformation previously described on the basis of experimental work by the author. applications of these results to the transformations reviewed are given. LES ASPECTS CRISTALLOGRAPHIQUES DES TRANSFORMATIONS DES PHASES /?, 8' ET 5 DANS LES ALLIAGES ARGENT-ZINC On passe en revue les structures et les transformations qui apparaissent dams les alliages argent-zinc de composition approximativement Bqui-atomique. Les relations cristallo-graphiques des phases /l' et 5 sont ex

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Author

W.J Kitchingman

Publisher

Elsevier Science; Elsevier ; University of Toronto Press; Elsevier BV (ISSN 0001-6160)

Published

1962

Language

EN

Field

Engineering (Physical Sciences)