Accession Number:

AD0266881

Title:

SUBSTRUCTURE AND MECHANICAL PROPERTIES OF REFRACTORY METALS

Descriptive Note:

Corporate Author:

MANLABS INC CAMBRIDGE MASS

Personal Author(s):

Report Date:

1961-08-01

Pagination or Media Count:

1.0

Abstract:

Quantitative results on the substructural characteristics of W, Mo, Ta and Co are being obtained through the coordinated programs of the five laboratories. Changes in subboundary spacing of worked materials were measured microscopically as a function of annealing temperature, and corresponding changes in particle size and lattice strain were obtained by Fourier analyses of diffraction-line shapes. Combined application of x-ray reflection microscopy, double-crystal diffractometry, and transmission electron microscopy to single-crystal and polycrystalline W revealed various orders of substructure in terms of size, disorientation, and dislocation arrays and progressive alterations were traced through the stages of recovery and recrystallization. Stacking faults and twins have been found in W and Co after high-temperature annealing. The complex interfolding of the distorted grains and the formation of deformation bands produce an unexpectedly large number of boundary intercepts per unit of transverse distance. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE