Design of Novel Precipitate-Strengthened Al-Co-Cr-Fe-Nb-Ni High-Entropy Superalloys

Antonov, Stoichko; Detrois, Martin; Tin, Sammy

doi:10.1007/s11661-017-4399-9

Title: Design of Novel Precipitate-Strengthened Al-Co-Cr-Fe-Nb-Ni High-Entropy Superalloys

Journal Article · Thu Nov 16 00:00:00 EST 2017 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-017-4399-9· OSTI ID:1468393

^[1]; Detrois, Martin ^[2]; Tin, Sammy ^[1]

Illinois Inst. of Technology, Chicago, IL (United States)
National Energy Technology Lab. (NETL), Albany, OR (United States)

Here, a series of non-equiatomic Al-Co-Cr-Fe-Nb-Ni high-entropy alloys, with varying levels of Co, Nb and Fe, were investigated in an effort to obtain microstructures similar to conventional Ni-based superalloys. Elevated levels of Co were observed to significantly decrease the solvus temperature of the γ' precipitates. Both Nb and Co in excessive concentrations promoted the formation of Laves and NiAl phases that formed either during solidification and remained undissolved during homogenization or upon high-temperature aging. Lowering the content of Nb, Co, or Fe prevented the formation of the eutectic type Laves. In addition, lowering the Co content resulted in a higher number density and volume fraction of the γ' precipitates, while increasing the Fe content led to the destabilization of the γ' precipitates. Various aging treatments were performed which led to different size distributions of the strengthening phase. Results from the microstructural characterization and hardness property assessments of these high-entropy alloys were compared to a commercial, high-strength Ni-based superalloy RR1000. Potentially, precipitation-strengthened high-entropy alloys could find applications replacing Ni-based superalloys as structural materials in power generation applications.

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Research Organization:: National Energy Technology Lab. (NETL), Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE)

OSTI ID:: 1468393

Journal Information:: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 49, Issue 1; ISSN 1073-5623

Publisher:: ASM InternationalCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 41 works

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Phase Constituent and Microhardness of As-Cast and Long-Time Annealed AlxCo2−xCrFeNi Multicomponent Alloys Sun, Ya; Wu, Changjun; Peng, Haoping Journal of Phase Equilibria and Diffusion, Vol. 40, Issue 5 https://doi.org/10.1007/s11669-019-00761-9	journal	October 2019
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