Accession Number : ADA191495

Title :   Fundamental Studies of Beta Phase Decomposition Modes in Titanium Alloys.

Descriptive Note : Annual technical rept. 1 Oct 86-30 Sep 87,

Corporate Author : CARNEGIE MELLON UNIV PITTSBURGH PA DEPT OF METALLURGICAL ENGINEERING AND MATE RIALS SCIENCE

Personal Author(s) : Aaronson, H I ; Dalley, A M ; Furuhara, T ; Mou, Y

PDF Url : ADA191495

Report Date : 31 Jan 1988

Pagination or Media Count : 30

Abstract : An investigation of the interphase boundary structure of grain boundary alpha allotriomorphs in a Ti-7.15 W/O Cr alloy now in progress has established that complex, multiple sets of ledges are present at the interphase boundaries of allotriomorphs between not only the B grain with respect to which the allotriomorphs is Burgers oriented but also with respect to the adjacent B grain, with which the allotriomorph necessarily has a non-Burgers orientation relationship. Questions are arising, however, as to whether certain systems of ledges are (immobile) structural and growth ledges. Resolution of the misfit dislocations which must be present on the terraces of both types of ledges and distinguishing between misfit dislocations and ledges with short risers are important problems which have arisen in TEM studies of these interphase boundaries.

Descriptors :   *DECOMPOSITION, *PHASE STUDIES, *TITANIUM ALLOYS, CRYSTAL SUBSTRUCTURE, DISLOCATIONS, GRAIN BOUNDARIES, STRUCTURAL PROPERTIES, ALUMINUM ALLOYS, CRYSTAL STRUCTURE, IRON ALLOYS, SILVER ALLOYS, TITANIUM ALLOYS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE