Accession Number : AD0787521

Title :   Study of Metastable Alloy Phases by Diffraction Techniques Based on High-Resolution Energy Counters.

Descriptive Note : Final rept.,

Corporate Author : NORTHEASTERN UNIV BOSTON MASS

Personal Author(s) : Gleasen,Bill C.

Report Date : 30 AUG 1974

Pagination or Media Count : 13

Abstract : This report summarizes the results obtained in a study of metastable alloys produced by ultra-rapid quenching from the melt (splat cooling). The crystal structures of new metastable phases were determined by X-ray powder diffractometry; the energy dispersive diffraction technique originally intended for use in this work was evaluated and improved but found to be less powerful for the present purpose than angular dispersive diffractometry. Results in six main areas are listed: (1) B-metal alloys, including the Sn-Tl, Hg-In, Hg-Tl and Pb-Sn systems and Ga phases with In and Sn; (2) Ge alloy phases with Fe, especially a vacancy-stabilized CsCl type Ge-Fe phase connecting with six-coordinated metastable Ge(Fe); (3) A review of the splat cooling process; (4) Structures of the equilibrium phases AuPb3, Cr5Si3Cx, and 5 ternary M phases; (5) Use of energy dispersive counters for X-ray diffraction work; (6) Structures of metastable alloys at high pressures. (Modified author abstract)

Descriptors :   *Alloys, *Phase studies, *Quenching, X ray diffraction, Tin alloys, Thallium alloys, Mercury alloys, Indium alloys, Lead alloys, Gallium alloys, Radiation measuring instruments, Germanium alloys, Iron alloys, Cesium compounds, Chlorides, Gold alloys, Intermetallic compounds, Carbides, Silicon carbides, Chromium compounds

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE