Accession Number : AD0712474

Title :   PLASTIC PROPERTIES AND FRACTURE OF TITANIUM-ALUMINUM ALLOYS.

Descriptive Note : Final rept. 27 May 68-26 May 69,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA SCHOOL OF METALLURGY AND MATERIALS SCIENCE

Personal Author(s) : Truax,D. J. ; McMahon,C. J. , Jr

Report Date : JUL 1969

Pagination or Media Count : 33

Abstract : A program of research was conducted to determine the effects of Al content and Ti3Al precipitation o the micro- and macroplastic behavior of Ti-Al alloys, and also to investigate the effects of Al content and Ti3Al on the susceptibility to, and mechanism of, stress corrosion cracking in a methanol - 1.5% HCl environment. The tensile microstrain parameters sigma sub E and sigma sub A increase with Al content. Tests on aged Ti-6 and Ti-8 wt. % Al material indicate that the influence of Ti3Al on the microstrain parameters and flow stress is athermal. Stress corrosion specimens which had been solution treated and quenched failed primarily by intergranular parting. Specimens in the aged condition exhibit a mixture of cleavage fractures and some intergranular parting. It is thought that stress corrosion failure in Ti-Al alloys proceeds as a consequence of anodic dissolution. (Author)

Descriptors :   (*TITANIUM ALLOYS, *STRESS CORROSION), ALUMINUM ALLOYS, PLASTIC PROPERTIES, FRACTURE(MECHANICS), STRAIN(MECHANICS)

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE