Microstructure, mechanical and corrosion behaviors of AlCoCuFeNi-(Cr,Ti) high entropy alloys

Xiao, D. H.; Zhou, P. F.; Wu, W. Q.; Diao, H. Y.; Gao, M. C.; Song, M.; Liaw, P. K.

doi:10.1016/j.matdes.2016.12.036

Title: Microstructure, mechanical and corrosion behaviors of AlCoCuFeNi-(Cr,Ti) high entropy alloys

Journal Article · Thu Dec 15 00:00:00 EST 2016 · Materials & Design

DOI:https://doi.org/10.1016/j.matdes.2016.12.036· OSTI ID:1482353

Xiao, D. H. ^[1]; Zhou, P. F. ^[2]; Wu, W. Q. ^[2]; Diao, H. Y. ^[3]; Gao, M. C. ^[4]; Song, M. ^[2]; Liaw, P. K. ^[3]

Central South Univ., Changsha (China). State Key Lab. of Powder Metallurgy; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
Central South Univ., Changsha (China). State Key Lab. of Powder Metallurgy
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)

The equimolar AlCoCuFeNi-(Cr,Ti) high entropy alloys (HEAs) were synthesized by nonconsumable arc melting to investigate the effects of Cr and Ti on the mechanical and corrosion properties of HEAs. The results showed that as-cast AlCoCuFeNi-(Cr,Ti) HEAs have a multi-phase microstructure, of which the solid-solution face-centered cubic (FCC), body-centered cubic (BCC) phases, and intermetallics can be observed. Ab initio molecular-dynamics (AIMD) simulations exhibit the existence of the preferred short-range ordering of Al-Ni, Co-Cr, Cr-Fe, and Ti-Co pairs in the AlCoCuFeNiCrTi liquid structure. The AIMD simulations are consistent with the experimental observation during solidification. The segregations and the FCC Cu-rich phase appear in the AlCoCuFeNiCrTi alloy, which is in agreement with AIMD calculations. The Cr addition to AlCoCuFeNi facilitates the formation of the BCC phases in the AlCoCuFeNiCr alloy, which can be explained by the larger Ω and smaller δ values. The addition of large Ti atoms facilitates the formation of the FCC phase, which is due to the fact that Ti will easily induce the breakdown of the BCC solid-solution of the AlCoCuFeNi alloy in terms of decreasing the Ω value and increasing the δ value. Finally, the Cr addition improves the corrosion resistance of AlCoCuFeNi alloys.

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Research Organization:: Univ. of Tennessee, Knoxville, TN (United States); National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States); Central South University, Changsha (China)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); US Army Research Office (ARO); National Science Foundation (NSF); Natural Science Foundation of Hunan (China); Central South Univ. (China); USDOE Office of Fossil Energy and Carbon Management (FECM)

Grant/Contract Number:: FE0008855; FE0024054; FE0011194; FE0004000; W911NF-13-1-0438; CMMI-11000; DMR-1611180; 2016JJ214; 11100-410500063; FE-0008855; FE-0024054

OSTI ID:: 1482353

Alternate ID(s):: OSTI ID: 1411493

Journal Information:: Materials & Design, Vol. 116; ISSN 0264-1275

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 153 works

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