Accession Number : AD0290643

Title :   INVESTIGATION OF FACTORS RELATED TO AN UNKNOWN PHASE IN B120 VCA TITANIUM ALLOY

Corporate Author : AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : LEVINSON,DAVID W.

Report Date : OCT 1962

Pagination or Media Count : 1

Abstract : A study was made of the needle-like precipitate which had been observed to occur in B120 VCA as a result of welding or of solution treating at temperatures above 1100 C. The phase was found to be the alpha phase, stabilized by oxygen. Under conditions of strict oxygen exclusion theALPHA NEEDLES DO NOT APPEAR. The embrittlement of material aged after either welding or overheating during solution treatment was found to be unaffected by the alpha needles. Embrittlement occurred whether or not needles were present in the microstructure. Some evidence is presented which implies that omega phase precipitation may produce the embrittlement. (Author)

Descriptors :   *TITANIUM ALLOYS, ALUMINUM ALLOYS, CHROMIUM ALLOYS, ELECTRICAL CONDUCTIVITY, ELECTRON MICROSCOPY, MECHANICAL PROPERTIES, MELTING, PHASE STUDIES, VANADIUM ALLOYS, WELDING, X RAY DIFFRACTION

Distribution Statement : APPROVED FOR PUBLIC RELEASE