Eutectic Alloy Optimization Program.
Abstract
The development of a eutectic alloy composed of two ductile phases has proceeded. Cobalt additions to the gamma-alpha (Ni-37 w/o Cr-18 w/o W-0.1 w/o Al) eutectic improved phase alignment and increased strength at both room and elevated temperatures. No effect of cobalt on phase equilibria was observed. The gamma phase was substantiated as face centered cubic (FCC), while the crystallography of the alpha phase remained uncertain. Improvement of 73C eutectics in stability in thermal cyclic environments was sought by alloying and study of the mechanism of damage. Additions of aluminum, iron and nickel stabilized the FCC structure of the cobalt matrix of 73C eutectics, thus increasing stability in thermal cycling environments. Carbide size and volume fraction also had an influence on thermal cyclic stability, but their contribution was found to be less important than carbide perfection.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1974
- Accession Number
- ADA004266
Entities
People
- E. H. Kraft