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

Authors:
; ; ; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1411493
Grant/Contract Number:
FE-0008855; FE-0024054
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Materials & Design
Additional Journal Information:
Journal Volume: 116; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-12-06 12:35:56; Journal ID: ISSN 0264-1275
Publisher:
Elsevier
Country of Publication:
United Kingdom
Language:
English

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 Kingdom: N. p., 2017. 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 Kingdom. 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.. Wed . "Microstructure, mechanical and corrosion behaviors of AlCoCuFeNi-(Cr,Ti) high entropy alloys". United Kingdom. doi:10.1016/j.matdes.2016.12.036.
@article{osti_1411493,
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 = {},
doi = {10.1016/j.matdes.2016.12.036},
journal = {Materials & Design},
number = C,
volume = 116,
place = {United Kingdom},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.matdes.2016.12.036

Citation Metrics:
Cited by: 4works
Citation information provided by
Web of Science

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  • The microstructure and mechanical properties studies of a series of two-phase f.c.c./B2 (ordered b.c.c.) lamellar-structured, high entropy alloys (HEA) Fe 36Ni 18Mn 33Al 13Ti x with x up to 6 at. % Ti have been investigated. X-ray microanalysis in a TEM showed that the Ti resided mostly in the B2 phase. The lamellar spacing decreased significantly with increasing Ti content from 1.56 μm for the undoped alloy to 155 nm with an addition of 4 at. % Ti, leading to a sharp increase in room-temperature yield strength,σ y, from 270 MPa to 953 MPa, but with a concomitant decrease inmore » ductility from 22% elongation to 2.3%. Annealing at 1173 K for 20 h greatly increased the lamellar spacing of Fe 36Ni 18Mn 33Al 13Ti 4 to 577 nm, producing a corresponding decrease in σy to 511 MPa. The yield strengths of all the doped alloys decreased significantly when tensile tested at 973 K with a concomitant increase in ductility due to softening of the B2 phase. The fracture mode changed from cleavage at room temperature to a ductile dimple-type rupture at 973 K. Lastly, the results are discussed in terms of the Hall-Petch-type relationship.« less
  • The microstructure and mechanical properties studies of a series of two-phase f.c.c./B2 (ordered b.c.c.) lamellar-structured, high entropy alloys (HEA) Fe36Ni18Mn33Al13Tix. with x up to 6 at. % Ti have been investigated. X-ray microanalysis in a TEM showed that the Ti resided mostly in the B2 phase. The lamellar spacing decreased significantly with increasing Ti content from 1.56 mu m for the undoped alloy to 155 nm with an addition of 4 at. % Ti, leading to a sharp increase in room-temperature yield strength, sigma(y), from 270 MPa to 953 MPa, but with a concomitant decrease in ductility from 22% elongationmore » to 2.3%. Annealing at 1173 K for 20 h greatly increased the lamellar spacing of Fe36Ni18Mn33Al13Ti4 to 577 nm, producing a corresponding decrease in sigma(y) to 511 MPa. The yield strengths of all the doped alloys decreased significantly when tensile tested at 973 K with a concomitant increase in ductility due to softening of the B2 phase. The fracture mode changed from cleavage at room temperature to a ductile dimple-type rupture at 973 K. The results are discussed in terms of the Hall-Petch-type relationship.« less
  • Ni-Cr-Co-Ti-V-Al high-entropy alloy coating on Ti-6Al-4V was synthesized by laser surface alloying. The coating is composed of a B2 matrix and (Co, Ni)Ti{sub 2} compounds with few β-Ti phases. Focused ion beam technique was utilized to prepare TEM sample and TEM observations agree well with XRD and SEM results. The formation of HEA phases is due to high temperature and rapid cooling rate during laser surface alloying. The thermodynamic parameters, ΔH{sub mix}, ΔS{sub mix}and δ as well as Δχ, should be used to predict the formation of the BCC solid solution, but they are not the strict criteria. Especially whenmore » Δχ reaches a high value (≥ 10%), BCC HEA will be partially decomposed, leading to the formation of (Co, Ni)Ti{sub 2} compound phases. - Highlights: •Preparing HEA coating on Ti-6Al-4V by laser surface alloying is successful. •The synthesized HEA coating mainly consists of BCC HEA and (Co, Ni)Ti{sub 2} compounds. •FIB technology was used to prepare the sample for TEM analysis. • ΔH{sub mix}, ΔS{sub mix}and δ as well as Δχ, should be all used to predict the formation of solid solution.« less