The Influence of Coherency Strain on the Elevated Temperature Tensile Behavior of Ni-15Cr-A1-Ti-Mo Alloys.
Abstract
The effect of coherency strain on elevated temperature tensile strength was examined in a model, two-phase gamma prime-strengthened Ni-15Cr-Al-Ti-Mo alloy series. The temperature dependence of coherency strain as represented by the gamma-gamma prime mismatch was determined over the temperature range 25 C to 300 C. The flow stress increment delta sigma sub y prime due to precipitation of gamma prime was found to correlate well to the magnitude of the gamma-gamma prime mismatch over the same temperautre interval. The correlation was strongest for high misfit alloys regardless of the Antiphase Boundary Energy (APBE). The predominance of by-pass type dislocation-particle interactions in high coherency alloys confirms that strengthening is primarily due to coherency strains. Conversely, alloys with low misfit exhibit two distinct particle shear mechanisms believed to be dependent upon the relative APBE and matrix stacking falt energy of the alloy.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1980
- Accession Number
- ADA092781
Entities
People
- D. A. Grose
- G. S. Ansell
Organizations
- Rensselaer Polytechnic Institute