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

Abstract

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.

Authors:
 [1];  [2];  [2];  [3];  [4];  [2];  [3]
  1. Central South Univ., Changsha (China). State Key Lab. of Powder Metallurgy; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  2. Central South Univ., Changsha (China). State Key Lab. of Powder Metallurgy
  3. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
  4. National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States)
Publication Date:
Research Org.:
Univ. of Tennessee, Knoxville, TN (United States); National Energy Technology Lab. (NETL), Albany, OR (United States); AECOM, Albany, OR (United States); Central South Univ., Changsha (China)
Sponsoring Org.:
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)
OSTI Identifier:
1482353
Alternate Identifier(s):
OSTI ID: 1411493
Grant/Contract Number:  
FE0008855; FE0024054; FE0011194; FE0004000; W911NF-13-1-0438; CMMI-11000; DMR-1611180; 2016JJ214; 11100-410500063; FE-0008855; FE-0024054
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Materials & Design
Additional Journal Information:
Journal Volume: 116; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high entropy alloys; chromium; titanium; microstructure; properties

Citation Formats

Xiao, D. H., Zhou, P. F., Wu, W. Q., Diao, H. Y., Gao, M. C., Song, M., and Liaw, P. K. Microstructure, mechanical and corrosion behaviors of AlCoCuFeNi-(Cr,Ti) high entropy alloys. United States: N. p., 2016. Web. doi:10.1016/j.matdes.2016.12.036.
Xiao, D. H., Zhou, P. F., Wu, W. Q., Diao, H. Y., Gao, M. C., Song, M., & Liaw, P. K. Microstructure, mechanical and corrosion behaviors of AlCoCuFeNi-(Cr,Ti) high entropy alloys. United States. doi:10.1016/j.matdes.2016.12.036.
Xiao, D. H., Zhou, P. F., Wu, W. Q., Diao, H. Y., Gao, M. C., Song, M., and Liaw, P. K. Thu . "Microstructure, mechanical and corrosion behaviors of AlCoCuFeNi-(Cr,Ti) high entropy alloys". United States. doi:10.1016/j.matdes.2016.12.036. https://www.osti.gov/servlets/purl/1482353.
@article{osti_1482353,
title = {Microstructure, mechanical and corrosion behaviors of AlCoCuFeNi-(Cr,Ti) high entropy alloys},
author = {Xiao, D. H. and Zhou, P. F. and Wu, W. Q. and Diao, H. Y. and Gao, M. C. and Song, M. and Liaw, P. K.},
abstractNote = {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.},
doi = {10.1016/j.matdes.2016.12.036},
journal = {Materials & Design},
issn = {0264-1275},
number = ,
volume = 116,
place = {United States},
year = {2016},
month = {12}
}

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Works referencing / citing this record:

Synthesis of a single phase of high-entropy Laves intermetallics in the Ti–Zr–V–Cr–Ni equiatomic alloy
journal, December 2017