Accession Number : AD0740115

Title :   Development of Ultrahigh-Strength, Ductile Titanium Alloys by Thermomechanical Processing and Transformation-Induced Plasticity.

Descriptive Note : Final rept. 1 Jan-31 Dec 71,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CALIF

Personal Author(s) : Weinstein,D.

Report Date : FEB 1972

Pagination or Media Count : 32

Abstract : The report summarizes results of the second year of a program for development of TRIP-type titanium alloys. Ternary, quaternary, and more complex alloys were investigated for strain-or stress-induced martensitic transformation during tensile testing at room temperature. It was determined that molybdenum- and vanadium-stabilized beta alloys do not transform martensitically during deformation. Microstructural features that looked like martensite were actually mechanical twins in the beta phase. Moreover, the stress to initiate twinning is low, thus causing premature yielding and anomalously low yield strengths. (Author)

Descriptors :   (*TITANIUM ALLOYS, PLASTIC PROPERTIES), PHASE STUDIES, MOLYBDENUM ALLOYS, ZIRCONIUM ALLOYS, ALUMINUM ALLOYS, TIN ALLOYS, VANADIUM ALLOYS, CHROMIUM ALLOYS, DUCTILITY, TRANSFORMATIONS, TENSILE PROPERTIES, HEAT TREATMENT

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE