Accession Number:

ADA214843

Title:

Metal Matrix Composite: Strengthening Mechanisms

Descriptive Note:

Annual rept. Oct 1988-Sep 1989

Corporate Author:

MARYLAND UNIV COLLEGE PARK METALLURGICAL MATERIALS LAB

Personal Author(s):

Report Date:

1989-10-01

Pagination or Media Count:

157.0

Abstract:

All of the existing strengthening mechanisms that have been proposed to explain the increase in strength of discontinuous reinforcement composites are based on the assumption that the reinforcement does not perform. However, it appears that TiB2 deforms at high temperature within the NiA1 matrix. It has also been observed that there is no apparent dislocation generation due to the difference in coefficient of thermal expansion between TiB2 and NiAl. A finite element investigation has demonstrated how and why the deformation is localized in discontinuous reinforced composites. The addition of discontinuous SiC to Al alloys can result in a five-fold increase in the yield stress and this increase in strength is readily accounted for by changes in the matrix strength. Keywords Metal matrix composites Titanium Nickel Aluminum TiB2NiAl. kt

Subject Categories:

  • Laminates and Composite Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE