Accession Number:

ADA210550

Title:

Development of Metastable Processing Paths for High Temperature Alloys

Descriptive Note:

Semi-Annual technical rept. 1 Oct 1988-31 Mar 1989

Corporate Author:

NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD METALLURGY DIV

Report Date:

1989-05-23

Pagination or Media Count:

63.0

Abstract:

The development of acceptable toughness and creep strength in high temperature intermetallic alloys is closely related to the formation of proper distributions of second phase particles. Phases are needed both to arrest crack growth at low temperatures and to resist creep at high temperatures. The possibility of developing new processing strategies for high temperature intermetallic compounds is being investigated. In particular rapid solidification andor rapid solid state quenching followed by controlled heat treatment may provide new and unusual microstructures of multiphase materials. This report describes research performed in the Metallurgy Division at NIST to a develop predictive models for solubility extension and metastable phase formation of intermetallic compounds by rapid solidification, b analyze the kinetics of decomposition of metastable phases involving ordering and c improve the phase diagram modeling of systems involving ordered phases. Keywords Physical properties Reaction kinetics Molecule molecule interaction Metal alloys.

Subject Categories:

  • Properties of Metals and Alloys
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE