Abstract
The elevated temperature properties of NiAl slightly enriched with ~900 appm nitrogen by atomizing the aluminide to powder under a nitrogen atmosphere have been determined. Compression samples were machined from hot extruded material and tested in air between 1100 and 1400 K under both constant velocity and constant load conditions. It appears that N in solid solution contributes little to the creep strength of B2 nickel aluminide. Excess nitrogen leading to the formation of A1N and A1(O,N) particles, however, can have a pronounced effect on creep behavior. These fine secondphase particles stabilize a small grain structure which, in turn, can improve or reduce the mechanical strength, depending on the deformation conditions. Under certain test conditions, high-angle grain boundaries can break away from the particles and overall grain growth occurs, leaving behind a network of A1N and A1(O,N) particles. This network of particles is very effective in anchoring a small, stable subgrain structure that provides elevated temperature strength without being subject to undesirable, weakening grain-boundary deformation mechanisms. Overall, the results provide further evidence that creep in NiAl is dislocation-climb controlled which involves subgrain formation and that stabilization of subgrains will improve mechanical strength in the manner proposed by Sherbyet al.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.