Accession Number : AD0731021

Title :   Relaxation Processes in Metastable Beta Titanium Alloys.

Descriptive Note : Technical rept.,

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

Personal Author(s) : Sommer,A. W. ; Motokura,S. ; Ono,K. ; Buck,O.

Report Date : SEP 1971

Pagination or Media Count : 35

Abstract : Extensive observations have been made on an internal friction peak in a series of metastable beta Ti-Mo and -V alloys. The peak was observed at two frequencies (10 to the 4th c/s and 10 to the 7th c/s) in temperature ranges of 120K to 140K and 153K to 210+K respectively depending on alloy compositions as well as frequency. In both alloy systems, the peak strength passed through a maximum with increasing alloy content at or near the upper compositional bound for athermal omega formation. In both alloy systems, the peak persisted at compositions well above the upper compositional bound for athermal omega formation although it was greatly diminished in height. The peak's strength was severely reduced by annealing in the thermal omega precipitation temperature range. The results of the work will be compared to the properties of a similar internal friction peak reported earlier in Zr base alloys. (Author)

Descriptors :   (*TITANIUM ALLOYS, *INTERNAL FRICTION), TEST METHODS, RELAXATION TIME, MICROSTRUCTURE, PHASE STUDIES

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE