Deformation and Fracture in Al-CuAl2 Eutectic Composites.
Abstract
Ambient temperature compressive stress-strain behavior to failure, and associated structural detail, were characterized in Al-CuAl2 composites of small interlamellar spacing (< or = 2 microns). Differences in the compressive and tensile yield stress levels of the composite are attributed to thermally induced residual stress. Analysis gives a residual tensile stress of about 3500 psi and an in-situ yield stress of about 13,500 psi in the aluminum-rich phase. Evidence for a dislocation-interface interaction is provided by the form of deformation substructure in the aluminum-rich phase. Failure in these multi-grained eutectic composites is shown to be controlled primarily by shear-mode buckling of the lamellar structure. Buckling leads to cleavage of the CuAl2 phase, shear in the aluminum-rich phase, accompanied by void formation, coalescence and crack formation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1971
- Accession Number
- AD0718360
Entities
People
- A. Pattnaik
- Alan Lawłey
Organizations
- Drexel University