Accession Number:

AD0608146

Title:

THE USE OF STRAIN SOFTENING TO IMPROVE THE PROPERTIES OF REFRACTORY METALS.

Descriptive Note:

Quarterly progress rept. no. 3, 1 Jun-31 Aug 64,

Corporate Author:

MATERIALS RESEARCH LAB INC RICHTON PARK ILL

Personal Author(s):

Report Date:

1964-08-31

Pagination or Media Count:

10.0

Abstract:

During the present report period, attempts were made to reduce the scatter in both as-received and flexed Mo-0.5 Ti by two different surface treatments, viz., electropolishing and mechanical grinding. Neither of these were effective in reducing the scatter, however, implying that scatter results from a random internal distribution of flaws. Surface notches were applied to the bend test samples in order to introduce a flaw larger than the random ones occurring in the plate. This decreased the amount of scatter, but probably more important, the ductility at all testing temperatures was lowered so that a comparison of the flexed and as-received material was no longer limited by the angle of the punch. The introduction of the mild surface notch elevated the transition temperature 200-300F. Flexing Mo-0.5 Ti plates was found to approximately double their notch bend ductility in both the longitudinal and transverse direction over much of the range of testing temperatures. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE