Accession Number:

ADA222853

Title:

Growth and Deformation Mechanisms of Refractory Alloy Hybrid Materials

Descriptive Note:

Final rept. Sep 1986-Sep 1989

Corporate Author:

MCDONNELL DOUGLAS RESEARCH LABS ST LOUIS MO

Report Date:

1989-04-01

Pagination or Media Count:

69.0

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 whiskerparticulate 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 Tirare-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.

Subject Categories:

  • Ceramics, Refractories and Glass

Distribution Statement:

APPROVED FOR PUBLIC RELEASE