Accession Number : AD0648252

Title :   STRAIN AGEING OF COMMERCIALLY PURE ALUMINUM.

Descriptive Note : Interim rept.,

Corporate Author : TECHNION - ISRAEL INST OF TECH HAIFA MATERIAL MECHANICS LAB

Personal Author(s) : Rosen,A.

Report Date : DEC 1966

Pagination or Media Count : 29

Abstract : Ageing of annealed commercially pure (99.4 percent) aluminum was carried out after pre-straining specimens and holding them under constant strain (relaxation) or constant stress (creep). Assitional ageing experiments were carried out on high purity (99.99 percent) aluminum. It was found that reloading commercially pure aluminum after ageing results in hardening and the appearance of a sharp yield point. The amount of hardening depends on many factors: the strain, the stress level, and the time of ageing, as well as the pre-straining history of the specimens and the rate of re-straining after ageing. The strain rate dependence of the upper yield point of the impure material and that of the yield point of the pure material after ageing are approximately the same. (Author)

Descriptors :   (*ALUMINUM, AGING(MATERIALS)), ISRAEL, STRAIN(MECHANICS), HARDENING, CREEP, RELAXATION TIME

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE