Accession Number : AD0776970

Title :   Phase Transformations in Vapor-Quenched Molybdenum and Molybdenum Gold Alloys.

Descriptive Note : Final rept. 15 Mar 72-31 Oct 73,


Personal Author(s) : Pilkington,G. ; Antwi-Boateng,G. ; Meyrick,G.

Report Date : FEB 1974

Pagination or Media Count : 73

Abstract : Thin films of Mo and of metastable single-phased Mo-Au alloys were prepared by vapor-quenching and subjected to a variety of aging treatments while their microstructural characteristics were studied by high resolution microscopy and through electric resistance measurements. When aged above 400C the alloys transformed by a complex process which involved competition among internal precipitation, surface precipitation and evaporation of the gold. The transformation was associated with resistance changes that followed second order kinetics, and activation energies that tended to increase as the transformation progressed. Depending upon the quality of the vacuum and the temperature of deposition amorphous, fcc and bcc modifications of molybdenum were produced. (Author)

Descriptors :   *Molybdenum alloys, *Gold alloys, *Molybdenum, *Phase transformations, Microscopy, Field emission, Electron microscopy, Crystal structure, Metal films

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE