Accession Number : ADA190793

Title :   Deformation of Rapidly Solidified Dispersion Strengthened Titanium Alloys.

Descriptive Note : Technical rept.,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE AND ENGINEE RING

Personal Author(s) : Kampe, S L ; Koss, D A

PDF Url : ADA190793

Report Date : Dec 1987

Pagination or Media Count : 37

Abstract : The influence of erbium on the flow behavior of titanium and titanium-aluminum base alloys has been investigated over a range of strain rates and temperatures (25 deg - 775 deg C). Data from as hot-extruded bulk specimens indicate that, although oxide dispersion strengthening can be large under certain conditions, the strengthening is minimal in fine-grain material subjected to low strain-rate deformation at high temperatures. Both micro-structural observations and an analysis of the flow data indicate profuse grain boundary sliding under these conditions. Grain coarsening anneals, which also coarsen the dispersoids and increase their population along grain boundaries, result in significantly improved high temperature flow strengths, especially in the high temperature/low strain-rate regime. Keywords: Deformation, Creep, Rapidly solidification, Dispersion strengthening, Titanium alloys.

Descriptors :   *TITANIUM ALLOYS, *HIGH STRENGTH ALLOYS, ALLOYS, ALUMINUM COMPOUNDS, CREEP, DEFORMATION, DISPERSION HARDENING, DISPERSIONS, ERBIUM, FINE GRAINED MATERIALS, FLOW, GRAIN BOUNDARIES, MICROSTRUCTURE, OXIDES, SOLIDIFICATION, STRAIN RATE, STRENGTH(MECHANICS), TITANIUM, TITANIUM COMPOUNDS, ALUMINUM ALLOYS, THERMAL STABILITY, MICROSTRUCTURE, DUCTILITY

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE