Accession Number : AD0720342

Title :   Role of Composition in Metallic Glass Formation.

Descriptive Note : Technical rept.,

Corporate Author : HARVARD UNIV CAMBRIDGE MASS DIV OF ENGINEERING AND APPLIED PHYSICS

Personal Author(s) : Bennett,C. H. ; Polk,D. E. ; Turnbull,D.

Report Date : FEB 1971

Pagination or Media Count : 16

Abstract : The paper surveys some ideas on the glass forming tendency of monatomic systems. According to the free volume model, glass formation in such systems would result primarily from 'jamming' due to the action of repulsive forces. From this viewpoint the metals most prone to glass formation should be those in which the repulsive part of the pair potential is, relatively, the largrdt; these are the noble, transition and polyvalent metals. Actually the most stable metal glasses formed so far are alloys of noble or transition metals (A) with compositions predominantly in the range A3B to A5B where B is a metalloid. The A elements may form a skeleton having a Bernal dense random packed structure which may be somewhat stabilized by filling its holes with metalloid atoms in the manner suggested by Polk. Some additional ideas on the effect of alloying on metal glass forming tendency are discussed. (Author)

Descriptors :   (*METALS, *GLASS), ALLOYS, PHASE STUDIES, IMPURITIES, CRYSTAL STRUCTURE, SILICIDES, GERMANIUM COMPOUNDS, NITRIDES, PHOSPHIDES

Subject Categories : Properties of Metals and Alloys
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE