MECHANISM OF FATIGUE IN METALLIC CRYSTALS.
Abstract
The origin and progressive growth of cracks on the surface of (112) and 123) oriented single crystals of aluminum subjected to cyclic deformation at 77K and 300 K were observed with a JEM 150 electron microscope. A negative carbon platinum replication technique was used which allowed a successive examination of the surface changes in a selected area on the surface of a specimen at given intervals of load application. Changes in crystallographic orientation or temperature did not appear to have any effect on the basic mode of crack formation, only the density and rate of crack growth. A tentative explanation of the mechanism of fatigue is proposed based on this work and other previous investigations. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1965
- Accession Number
- AD0616341
Entities
People
- M. A. Wilkov
- R. Shield
Organizations
- University of Texas at Austin