Plastic Strain Localization in Superalloy Single Crystals.
Abstract
Single crystals of two Nickel-based superalloys were tested under compression and fatigue conditions. Surface replies were periodically stripped and examined in the TEM. Very fine surface details were observed with slip line spacings on the order of 30 nm observable and by knowing crystal orientation slip lines could be defined as containing as few as 100 dislocations. A distinct difference was observed in the nature of surface slip between the two alloys tested with the high misfit alloy leading to broad slip bands and the low misfit alloy leading to very fine and discrete slip steps. The occurrence of porosity in single crystal superalloys was also studied as a function of crystal growth rate. The volume fraction of porosity was observed to depend on the mode of solidification (i.e. cellular dendritic). Higher growth rates were also found to result in lower volume fractions of porosity.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 1985
- Accession Number
- ADA176817
Entities
People
- A. F. Giamei
- D. L. Anton
Organizations
- United Technologies Corporation