Metal-matrix composite: Strengthening mechanisms. Annual report, October 1988-September 1989

Technical Report · Sun Oct 01 04:00:00 EDT 1989

OSTI ID:7008002

Arsenault, R J

All of the existing strengthening mechanisms 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 was also 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.

• Research Organization: Maryland Univ., College Park, MD (USA). Metallurgical Materials Lab.
• OSTI ID: 7008002
• Report Number(s): AD-A-214843/5/XAB; MML--1989-1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM
BORIDES
BORON COMPOUNDS
CARBIDES
CARBON COMPOUNDS
COMPOSITE MATERIALS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEFORMATION
DISLOCATIONS
DOCUMENT TYPES
ELEMENTS
EXPANSION
FINITE ELEMENT METHOD
LINE DEFECTS
MATERIALS
MATRIX MATERIALS
MECHANICAL PROPERTIES
METALS
NICKEL
NUMERICAL SOLUTION
PROGRESS REPORT
REINFORCED MATERIALS
SILICON CARBIDES
SILICON COMPOUNDS
STRESSES
THERMAL EXPANSION
TITANIUM
TITANIUM BORIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
YIELD STRENGTH