Accession Number : AD0703850

Title :   THE ROLE OF THE INTERFACE REGION ON THE MECHANICAL BEHAVIOR OF METAL-MATRIX COMPOSITES,

Descriptive Note : Mar 70

Corporate Author : DREXEL UNIV PHILADELPHIA PA DEPT OF METALLURGICAL ENGINEERING

Personal Author(s) : Pinnel,M. R. ; Lawley,A.

Report Date : FEB 1970

Pagination or Media Count : 26

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)

Descriptors :   (*ALUMINUM, COMPOSITE MATERIALS), (*STAINLESS STEEL, COMPOSITE MATERIALS), (*COMPOSITE MATERIALS, INTERFACES), MICROSTRUCTURE, WIRE, CREEP STRENGTH, STRAIN(MECHANICS)

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE