Investigation of Microstructural Factors that Cause Low Fracture Toughness in Silicon Carbide Whisker/Al Alloy Composites.
Abstract
The problem of low fracture toughness and low elongation to failure in silicon carbide whisker/aluminum alloy matrix composites is controlled by matrix composition and microstructure. Large, brittle, constituent particles as well as other precipitate phases along whisker interfaces strongly influence these properties. The purpose of this study is to define the fracture characteristics of the material from an atomic standpoint; to define the factors that influence fracture toughness and elongation; to propose a model for the failure mechanism and steps that can be taken to enhance the properties; and to evaluate materials produced by using these concepts. Work during the first year of this program has emphasized microstructural and mechanical property evaluation of systems with altered chemistry of the alloy matrix and thermomechanical treatments of standard alloy systems.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 15, 1986
- Accession Number
- ADA171798
Entities
People
- C. R. Harris
- F. E. Wawner
Organizations
- University of Virginia