Accession Number : AD0729145

Title :   Mechanical Behavior of High-Strength Beta-Titanium Alloys.

Descriptive Note : Technical rept.,

Corporate Author : NORTH AMERICAN ROCKWELL CORP LOS ANGELES CALIF LOS ANGELES DIV

Personal Author(s) : Ono,Kanji ; Rosales,L. A. ; Motokura,S. ; Sommer,A. W.

Report Date : AUG 1971

Pagination or Media Count : 24

Abstract : Thermomechanical treatments of Beta-III (11.5 Mo-6 Zr-4.5 Sn-Ti) and 18 Mo-Ti were performed in order to study microstructure-mechanical property relationships. Transmission electron microscopy was employed to delineate the effects that prior cold work and multiple aging steps produce in microstructure. The optimum combination of strength (230 ksi) and good ductility/toughness is obtained by cold work of the Beta-phase followed by preaging in the omega + Beta region and final aging in the alpha + Beta region to produce an extremely fine distribution of alpha-particles in the Beta-matrix. Results of an internal friction study on a series of Beta-Ti alloys containing various amounts of Mo and V with and without plastic deformation are also presented in order to describe the fundamental nature of the Beta-omega transformation. These results indicate the transformation to be of the 'atom shuttle' or displasive type. (Author)

Descriptors :   (*TITANIUM ALLOYS, MECHANICAL PROPERTIES), MICROSTRUCTURE, PHASE STUDIES, DISLOCATIONS, INTERNAL FRICTION, MOLYBDENUM ALLOYS, TIN ALLOYS, ZIRCONIUM ALLOYS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE