Accession Number : AD0673793

Title :   THE INTERFACE ENERGIES OF REFRACTORY METALS.

Descriptive Note : Final rept.,

Corporate Author : BATTELLE MEMORIAL INST COLUMBUS OHIO COLUMBUS LABS

Personal Author(s) : Allen,B. C.

Report Date : 01 JUL 1968

Pagination or Media Count : 117

Abstract : The average solid surface free energy of molybdenum has been measured using the Udin zero creep method at 2500C under 1 atmosphere of tantalum-gettered argon. Grain boundary grooving has been studied in chromium, molybdenum, and tungsten under a variety of conditions using high vacuum techniques and tantalum-gettered argon. Surface free energy and surface self-diffusion of molybdenum were studied in the temperature range 1600-2400C using pressure-sintered bicrystals. The average solid-surface free energy of chromium of various interstitial contents, molybdenum, Mo-0.5Ti, and tungsten were measured by the multiphase equilibria technique utilizing interferometry and found to be 15-50 percent lower than the corresponding liquid surface tensions. (Author)

Descriptors :   (*REFRACTORY METALS, GRAIN STRUCTURES(METALLURGY)), GRAIN BOUNDARIES, HIGH TEMPERATURE, CREEP, MOLYBDENUM, CHROMIUM, TUNGSTEN, POWDER METALLURGY, FREE ENERGY, SURFACE PROPERTIES, DIFFUSION, DYNAMICS, IMPURITIES

Subject Categories : Metallurgy and Metallography
      Crystallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE