Accession Number : ADA019518

Title :   Fracture Toughness and Aging Behavior of Alpha-Beta Titanium Alloys.

Descriptive Note : Final technical rept. 1 May 73-15 Mar 75,

Corporate Author : POLYTECHNIC INST OF NEW YORK BROOKLYN

Personal Author(s) : Margolin,Harold ; Levine,Ernest ; Young,Morris ; Mahajan,Yashwant

Report Date : SEP 1975

Pagination or Media Count : 90

Abstract : Fracture toughness K sub Q, was studied as a function of microstructure for alloy no. 2, Ti-5.25Al-5.5V-0.9Fe-0.5Cu, at a y.s. of 180 Ksi (1241 MN/sq m, and for Ti-6Al-2Sn-4Zr-6Mo at y.s. of 160 Ksi (1100MN/sq m), with emphasis on alloy no. 2. For equiaxed alpha structures K sub Q initially decreased with increasing grain size (G.S.) and subsequently increased. Analysis of Widmanstatten plus grain boundary alpha data separated out the G.S. contribution which was attributed to increased plasticity when the G.S. became significantly large with respect to calculated plastic zone sizes. Attempts were made to calculate individual contributions of matrix and alpha to K sub Q. Experiments were conducted to correlate microstructure and mechanical properties for Ti-6-2-4-6.

Descriptors :   *TITANIUM ALLOYS, FRACTURE(MECHANICS), TOUGHNESS, AGING(MATERIALS), MICROSTRUCTURE, CRACK PROPAGATION, GRAIN SIZE, INTERFACES, DEFECTS(MATERIALS), YIELD STRENGTH, DISLOCATIONS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE