ANALYTICAL AND EXPERIMENTAL INVESTIGATIONS OF THE FRACTURE MECHANISMS OF CONTROLLED POLYPHASE ALLOYS.
Abstract
An investigation has been perormed to study the mechanical properties and fracture mechanisms of several unidirectionally solidified binary eutectic alloys. The technique of unidirectional solidification has been applied to the Cu-Cr, Al-Al3Ni, and Al-CuAl2 alloy systems and controlled microstructures produced which consist of either a parallel array of lamellae or whiskers of one phase aligned in a ductile matrix. Mechanical tests (tension and flexure) have shown that these controlled alloys exhibit reinforcing hehavior. Individual Cr and Al3Ni whiskers, extracted from the composite structures, have been tested and have exhibited ultimate strengths in excess of 1,000,000 psi and 700,000 psi, respectively. Based on the mechanical test results, a new expression for the strength and modulus of a reinforced composite structure has been formulated which accounts for inequality of strain and inefficient load transfer brought about by premature fracture of the reinforcing phase. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 29, 1963
- Accession Number
- AD0424208
Entities
People
- F. D. Lemkey
- J. A. Ford
- R. W. Hertzberg
Organizations
- United Aircraft Corporation