ANALYTICAL AND EXPERIMENTAL INVESTIGATIONS OF THE FRACTURE MECHANISMS OF CONTROLLED POLYPHASE ALLOYS
Abstract
The results of continued investigations on selected unidirectionally solidified binary eutectic alloys are reported. Large grains were produced in the Al-CuAl2 eutectic ingots. Micro bend specimens, whose length dimension made an angle of zero, thirty, forty-five, sixty, and ninety degrees to the lamellae orientation, were prepared and tests carried out for the zero and ninety degree orientations indicated average tensile strengths of 46,800 psi and 22,900 psi, respectively. The failure mechanism(s) are characterized by Al platelet plastic deformation and by CuAl2 platelet cleavage. Preliminary in formation on the effect of Cr whisker orientation on the fracture mechanism(s) of unidirectionally solidified Cu-Cr ingots has been obtained for the case of whiskers oriented at 45 degrees to the tensile load axis. The predominant failure mode was of the shear type. Also, the fracture mode of specimens solidified at high growth rates and tested parallel to the fiber orientation was determined to be controlled by Cr whisker failure. Both shear and tensile failure modes were identified.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1963
- Accession Number
- AD0407007
Entities
People
- J. A. Ford
- R. W. Hertzberg
Organizations
- United Technologies Corporation