Accession Number : AD0698173

Title :   THE STRUCTURE, MECHANICAL PROPERTIES AND DEFORMATION BEHAVIOR OF Ti-Al AND Ti-Al-X ALLOYS,

Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH

Personal Author(s) : Williams,J. C. ; Blackburn,M. J.

Report Date : SEP 1969

Pagination or Media Count : 31

Abstract : Strengthening due to the precipitation of the ordered alpha sub 2 phase (based on Ti3X) was studied in binary and ternary Ti-Al-X3(where X = Sn, Ga, In or Pb) alloys. The observed strengthening can be separated into two principal components; one due to the dislocation/ordered particle interaction and the other due to dislocation/precipitate stress field interactions. The former of these appears more important in some cases, e.g., Ti-Al-Sn alloys; whereas the latter appears to predominate in other cases, e.g., Ti-Al-Ga alloys. The brittleness of single phase Ti3Al was shown to be related to slip morphology and the decreased extent of <11 -2 3> glide with increasing Al content. The marked improvement in strength and ductility of the Ti3(Al0.5Ga0.5) and Ti3(Al0.25Ga0.75) compounds results from the phase separation into alpha sub 2 + Ti2Ga with an accompanying change in slip morphology and an increase in the extent of <11 -2 3> glide. (Author)

Descriptors :   (*TITANIUM ALLOYS, METALLOGRAPHY), ALUMINUM ALLOYS, GALLIUM ALLOYS, TIN ALLOYS, INDIUM ALLOYS, LEAD ALLOYS, PHASE STUDIES, DISPERSION HARDENING, MICROSTRUCTURE, DISLOCATIONS, DEFORMATION, PHASE DIAGRAMS, MECHANICAL PROPERTIES

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE