Extreme hardness at high temperature with a lightweight additively manufactured multi-principal element alloy
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Kustas, Andrew↗
Engineering topics
Johnson, Duane
Publications and source records attributed to Johnson, Duane.
Predictive design of novel nickel-based superalloys beyond Haynes 282. Final Report FWP-AL-19-510-097
Nickel-based superalloys are in great demand for harsh-service conditions involving high temperatures and oxidative environments. Haynes 282 stands out due to its excellent high-temperature properties and easy fabricability. However, the upper usage temperature of Haynes 282 is limited due to its relatively low liquidus temperature. Through high-fidelity density functional theory calculations and high-throughput experiments, new compositions that show higher liquidus temperature and higher strength are explored. While maintaining processability, the newly designed alloy shows improved strength and ductility at room temperature and better oxidation resistance up to 800°C. The new compositions showcase a minor change in the refractory and metalloid content can have a significant impact on the mechanical and oxidation performance of superalloys.
36 MATERIALS SCIENCE↗
Chebyshev polynomials in the spectral Tau method and applications to Eigenvalue problems
Chebyshev Spectral methods have received much attention recently as a technique for the rapid solution of ordinary differential equations. This technique also works well for solving linear eigenvalue problems. Specific detail is given to the properties and algebra of chebyshev polynomials; the use of chebyshev polynomials in spectral methods; and the recurrence relationships that are developed. These formula and equations are then applied to several examples which are worked out in detail. The appendix contains an example FORTRAN program used in solving an eigenvalue problem.
Johnson, Duane↗