Journal
MATERIALS & DESIGN
Volume 133, Issue -, Pages 39-46Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2017.07.028
Keywords
First-principles calculations; gamma-Ni/gamma '-Ni3Al interfacial energy; Ni-based superalloys; Sixteen alloying elements
Categories
Funding
- Department of Energy (DOE) [DE-FE0024056]
- Office of Naval Research (ONR) [N0014-07-1-0638]
- National Natural Science Foundation of China (NSFC) [51429101]
- Materials Simulation Center
- Research Computing and Cyber infrastructure unit at the Pennsylvania State University
- Office of Science of the U.S. DOE [DE-AC02-05CH11231]
- National Science Foundation [ACI-1053575]
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Interfacial energy (sigma(gamma/gamma ')) of the gamma-Ni/gamma '-Ni3Al interface is critical to understand and design Ni-based superalloys. In the present work, a first-principles methodology with constrained relaxations has been used to study the effect of dilute alloying element (X) on sigma(gamma/gamma ') of the (100) coherent interface, where the sixteen X's include Al, Co, Cr, Fe, Hf, Mo, Nb, Pd, Pt, Re, Ru, Ta, Ti, W, Y, and Zr. sigma(gamma/gamma) = 19mJ/m(2) has been predicted for the unalloyed gamma/gamma ' interface, agreeing well with the previous estimations. It is found that the sigma(gamma/gamma) value is the lowest when alloying element is in gamma-Ni, while the addition to gamma '-Ni3Al increases sigma(gamma/gamma) due mainly to the in-plane lattice expansion. Specifically, our calculations show that alloying elements Mo, W, and Re have the largest effect on the sigma(gamma/gamma) value by decreasing it to 4-5 mJ/m(2) when partitioned to gamma-Ni; Ru and Pt are shown to increase greatly the sigma(gamma/gamma) value up to 2528 mJ/m(2) when partitioned to gamma-Ni; all ternary additions substituting for Ni in gamma '-Ni3Al increase sigma(gamma/gamma) except for Pt; and for Ti and Ta, which segregate strongly to gamma '-Ni3Al and substitute for Al, the sigma(gamma/gamma) values increase to 32 and 35 mJ/m2, respectively. (C) 2017 Elsevier Ltd. All rights reserved.
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