Accession Number : AD0766214

Title :   Physical Metallurgy Basis for Achieving 300-KSI Strength in Transage Titanium Alloys.

Descriptive Note : Final rept. 14 Oct 71-14 Aug 73,

Corporate Author : LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CALIF PALO ALTO RESEARCH LAB

Personal Author(s) : Crossley,Frank A.

Report Date : AUG 1973

Pagination or Media Count : 77

Abstract : ICS IN BETA-ANNEALED AND ALPHA-BETA-ANNEALED CONDITIONS. Thin-foil electron transmission was the principal metallographic means because the athermal martensite of these alloys is of the order of 10 A in thickness. The alloys undergo stress induced transformation in the annealed condition and possibly they experience this phenomenon in some age hardened conditions. The annealed conditions were starting states for thermomechanical treatment (TMT) studies for achieving 300-ksi strength. The strength goal seemed inherent in a number of the combinations of alloy and TMT schedule. Confirmation of the strength goal was not realized due to deficiencies in test specimens design and condition, and in the quality of machining. The fracture surfaces suggest that the materials have sufficient ductility to demonstrate the yield strength goal of 300-ksi. (Author)

Descriptors :   (*TITANIUM ALLOYS, MECHANICAL PROPERTIES), MICROSTRUCTURE, ALUMINUM ALLOYS, TIN ALLOYS, VANADIUM ALLOYS, ZIRCONIUM ALLOYS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE