THE ROLE OF THE INTERFACE REGION ON THE MECHANICAL BEHAVIOR OF METAL-MATRIX COMPOSITES,
Abstract
The tensile creep behavior and associated substructural detail have been characterized in aluminum-stainless steel composites at ambient temperature. Volume fractions in the range 0 to 0.33 were tested under constant load conditions (in the range 1.0 to 4.0 times macroscopic yield stress) with the load applied parallel to the direction of reinforcement. In both unreinforced aluminum and the composites, steady state creep conditions are established in < 100 hours. The stainless steel reinforcement significantly reduces the creep rate at a given stress level. Creep behavior is in agreement with that predicted by an exponential form of the rule-of-mixtures equation relating creep rate to applied stress and volume fraction reinforcement. Both fiber and matrix show an exponential dependence of creep-rate on stress with power exponents of 3.3 and 2.7, respectively. At a given level of creep strain and volume fraction reinforcement dislocation configurations and density in the aluminum matrix are independent of distance from the interface. In effect, the dislocation substructure is independent of volume fraction reinforcement and is controlled solely by the creep strain in the matrix. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1970
- Accession Number
- AD0703850
Entities
People
- Alan Lawłey
- M. R. Pinnel
Organizations
- Drexel University