Accession Number:

AD0263932

Title:

EFFECT OF PRESTRAIN TEMPERATURE ON THE STRAIN AGING OF ALPHA-IRON

Descriptive Note:

Corporate Author:

NORTHWESTERN UNIV EVANSTON ILL

Personal Author(s):

Report Date:

1961-09-20

Pagination or Media Count:

1.0

Abstract:

Yield point measurements were made on polycrystalline specimens of alpha-iron deformed various amounts at 77, 195 and 273 K aged and redeformed at 77, 195, and 273 K. When the prestrain temperature is lower than that subsequent to aging, the yield point return is suppressed relative to specimens deformed at the same temper-ATURE BOTH BEFORE AND AFTER AGING. The degree of suppression is a function of both the magnitude of prestrain at the lower temperature and the difference between the deformation temperatures before and after aging. It is proposed that the suppression is caused by the formation of dislocation barriers during the initial low temperature deformation. The aging kinetics of polycrystalline alpha-iron wires deformed at 77 or 303 K were studies at 44 and 64 C using internal friction measurements. No change was noted as a result of the difference in prestrain temperature. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE