Growth and Deformation Mechanisms of Refractory Alloy Hybrid Materials
Abstract
A major challenge in the development of dispersion-hardened alloys is to produce a high volume-fraction of the fine hardening particles. This challenge has been met through the use of Rapid Solidification Technology (RST). Application of RST to titanium alloys can produce oxide-dispersion-strengthened alloys having large volume-fractions of < or = 100 nanometers incoherent oxide dispersoids, and in situ composites containing high-modulus whisker/particulate reinforcements. These titanium alloys are a special class of refractory hybrid materials which have low density, yet have the high-temperature strength and stability required for use as hypersonic aircraft skins and structures. Oxide dispersions in RST Ti (Titanium) alloys are produced by Rapid Solidification Processing (RSP) and subsequent annealing of Ti/rare-earth alloys. Rapid solidification significantly increases the solid solubilities of rare-earth elements in Ti. Annealing causes the rare-earth elements to precipitate and scavenge in terstitial oxygen from the Ti matrix, forming rare-earth oxide dispersoids.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1989
- Accession Number
- ADA222853
Entities
People
- D. M. Bodwen
- D. S. Schwartz
- J. E. O'neal
- S. M. Sastry