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Role of chemical bonding in metallic glasses

✍ Scribed by H.S Chen; B.K Park


Publisher
Elsevier Science
Year
1973
Weight
684 KB
Volume
21
Category
Article
ISSN
0001-6160

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✦ Synopsis


Effects of Cu and Si on the densities and stabilities of glassy Pd-Cu-Si alloys have been studied.

These effects are discussed in terms of chemical bonding. It is found that (I) the relatively high densities of metallic glasses as compared to those of correspondmg crystalline phases are a characteristic that is independent of composition,

(2) the differences in the radial distribution functions (RDF) are reflections of differences in the short-range structural arrangements in liquids and (3) metals and metalloicls of similar atomic sizes play distinctive roles in the formation and stability of metallic glasses.

Therefore, the properties of glassy alloys are apparently dominatecl by the chemcial bonding among the constituent atoms, rather than their relative atomic sizes. ROLE DES LIdISOSS CHIJIIQLXES DASS LES VERRES JIETALLIQUES L'influence de Cu et de Si sur les densit& et les stabilites dea alliages vitreul Pd-Cu-Si a Qt6 BtucliBe. Ces influences sont elaminees B l'aide des liaisons chimiques. L'auteur trouve"' que les densites des verres mbtalliques, relativement QlevPes par rapport B celles des phases cristallines correspondantes, sont une caracteristique independante de la composition,'?' que les diffbrences dans les fonctions de repartition radiale sont le reflet des diff&ences clans les arrangements de structure a courte distance dans les liquides et(a) que les mbtaux et les mbtalloi'des de tailles atomiques semblables jouent des rBles bien caract6ristiques dans la formation et la stabilit6 des verres m6talliques. Les proprietbs des alliages vitreulr sont done apparemment domin6es par les liaisons chimiques cles atomes constituants, plutBt que par leurs tailles atomiques relatives.


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