Accession Number : ADA236600

Title :   Rapid Solidification Processing of Al3Ti and Al3Ti Plus Copper.

Descriptive Note : Progress rept. Oct 89-Oct 90,

Corporate Author : NAVAL AIR DEVELOPMENT CENTER WARMINSTER PA AIR VEHICLE AND CREW SYSTEMS TECHN OLOGY DEPT

Personal Author(s) : Frazier, William F. ; Benci, John ; Zanter, Joseph ; Tyndall, Harry

Report Date : 01 DEC 1990

Pagination or Media Count : 41

Abstract : The development of advanced airframes and propulsion systems has generated significant research and development activity in the area of light weight, high temperature intermetallic alloys, e.g., alpha-two and gamma titanium aluminides. However, Al3Ti, an intermetallic which has a low density (3.35 gcm-3) and a high melting point (1350 deg C) hes received little scientific scrutiny, principally because of its intrinsically low ductility. In this study, X-ray diffraction, and optical and electron microscopy wre used to interrogate the microstructure oa Al3Ti and Al3Ti plus copper in their as-cast and melt spun conditions. Rapid solidification enhanced chemical uniformity and the addition of copper transformed the structure of Al3Ti from tetragonal DO22 into cubic Li2, a structure with a higher crystallographic symmetry.

Descriptors :   ADDITION, AIRFRAMES, COPPER, CRYSTALLOGRAPHY, DUCTILITY, ELECTRON MICROSCOPY, GAMMA RAYS, HEAT RESISTANT ALLOYS, HIGH TEMPERATURE, INTERMETALLIC COMPOUNDS, LIGHTWEIGHT, LOW DENSITY, MELTING POINT, MICROSTRUCTURE, OPTICAL ANALYSIS, PROPULSION SYSTEMS, QUICK REACTION, SOLIDIFICATION, SYMMETRY, TITANIUM ALUMINIDE, X RAY DIFFRACTION.

Subject Categories : Inorganic Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE