Accession Number:

ADA193619

Title:

Development of Metastable Processing Paths for High Temperature Alloys

Descriptive Note:

Semi Annual rept. 1 Oct-31 Mar 1987

Corporate Author:

NATIONAL BUREAU OF STANDARDS GAITHERSBURG MD METALLURGY DIV

Personal Author(s):

Report Date:

1987-03-31

Pagination or Media Count:

47.0

Abstract:

The possibility of developing new processing strategies for high temperature intermetallic compounds is being investigated. In particular rapid solidification followed by controlled heat treatment may provide new and unusual microstructures of multiphase materials. This describes research performed at NBS to develop predictive models for solubility extension and metastable phase formation of intermetallic compounds and research to improve the phase diagram modeling of systems involving ordered phases. Theory has been developed to treat the formation of disordered variants of intermetallic compounds during rapid solidification. Using a modification of the Aziz solute trapping theory, solidification velocities required to form, for example a BCC phase from the melt when a B2 phase is the stable phase have been developed.

Subject Categories:

  • Properties of Metals and Alloys
  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE