Accession Number : AD0783288

Title :   Relationship of Composition and Structure to Strength in Titanium Alloys.

Descriptive Note : Final rept. 1 May 69-28 Feb 72,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF METALLURGY AND MATERIALS SCIENCE

Personal Author(s) : Breedis,John F.

Report Date : MAY 1974

Pagination or Media Count : 116

Abstract : The strengthening of beta-phase alloys by precipitation, alloying with an interstitial solute and grain refinement have been examined. Also considered in this work are the factors which influence the transition from slip to mechanical twinning as the dominant deformation mode. With regard to precipitation strengthening, omega-phase formation was examined in titanium-vanadium and the possibility of spinodal decomposition was studied in ternary titanium-niobium-metal alloys. With regard to the influence of interstitial solute and grain refinement on mechanical properties, the influence of oxygen, at three levels of oxygen equivalent, was studied in titanium-18 atom percent molybdenum-oxygen alloys. Grain sizes were also varied by an order of magnitude to examine the Hall-Petch relationship. (Modified author abstract)

Descriptors :   *Titanium alloys, *Yield strength, Phase transformations, Plastic deformation, Vanadium alloys, Niobium alloys, Molybdenum alloys, Oxygen, Twinning(Crystallography), Crack propagation, Grain size, Crystal structure, Stress strain relations

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE