Accession Number:

ADA064747

Title:

Structure, Stability and Toughness of (Co,Cr)-(Cr,Co) 7C3.

Descriptive Note:

Technical rept.,

Corporate Author:

DREXEL UNIV PHILADELPHIA PA DEPT OF MATERIALS ENGINEERING

Personal Author(s):

Report Date:

1978-11-01

Pagination or Media Count:

21.0

Abstract:

The substantial increase in efficiency of a gas turbine engine with increased inlet temperatures has led to the consideration of metal matrix composites for use as the blade material. In particular, in-situ composites, grown by directional solidification, consisting of high-strength fibers or plates in a ductile and tough matrix provide outstanding high temperature properties. This class of materials represents a major innovation in gas turbine technology for applications in aerospace, shipboard, and on land. Intrinsically, in-situ composites are stable at elevated temperatures, a characteristic derived from their solidification under near equilibrium conditions, coupled with the formation of low-energy interface boundaries. However, microstructural instability and attendant property degradation may occur as a result of prolonged high-temperature exposure, thermal cycling, or the presence of a thermal gradient. Since these reflect normal service conditions, it is necessary to assess composite integrity.

Subject Categories:

  • Laminates and Composite Materials
  • Properties of Metals and Alloys
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE