Effects of Si additions on microstructures and mechanical properties of VNbTiTaSix refractory high-entropy alloys

Z. Q. Xu; Z. L. Ma; Y. Tan; M. Wang; Y. Zhao; X. W. Cheng

doi:10.1016/j.jallcom.2021.163517

Effects of Si additions on microstructures and mechanical properties of VNbTiTaSi_x refractory high-entropy alloys

Z. Q. Xu, Z. L. Ma^*, Y. Tan, M. Wang, Y. Zhao, X. W. Cheng

^*Corresponding author for this work

School of Material Science and Engineering

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

36 Citations (Scopus)

Abstract

(VNbTiTa)_100-xSi_x (x = 0, 2.5, 5, 10) refractory high-entropy alloys (RHEAs) are investigated in this paper. The equal molar VNbTiTa RHEA exhibits a room-temperature yield strength of 704 MPa and good compressive ductility (fracture strain> 50%). Si additions can introduce BCC+M₅Si₃ eutectic formed at inter-dendrite areas, and when the Si content reaches 10% in mole, extra bulk M₃Si phase was observed. The precipitated silicides greatly improve the yield strength up to 1671 MPa. As the temperature increases, the strengthening effect of silicide becomes weaker, and almost disappeared at 1200 ℃. Nanoscale silicides can precipitate during high-temperature deformations. (VNbTiTa)_97.5Si_2.5 RHEA possesses an excellent combination of room-temperature ductility 34% and yield strength 505 MPa at 1000 ℃.

Original language	English
Article number	163517
Journal	Journal of Alloys and Compounds
Volume	900
DOIs	https://doi.org/10.1016/j.jallcom.2021.163517
Publication status	Published - 15 Apr 2022

Keywords

High-entropy alloys
High-temperature mechanical properties
Microstructure
Room temperature mechanical properties

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10.1016/j.jallcom.2021.163517

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@article{04fb2fd6ecf9408dafe74e0e721155e2,

title = "Effects of Si additions on microstructures and mechanical properties of VNbTiTaSix refractory high-entropy alloys",

abstract = "(VNbTiTa)100-xSix (x = 0, 2.5, 5, 10) refractory high-entropy alloys (RHEAs) are investigated in this paper. The equal molar VNbTiTa RHEA exhibits a room-temperature yield strength of 704 MPa and good compressive ductility (fracture strain> 50%). Si additions can introduce BCC+M5Si3 eutectic formed at inter-dendrite areas, and when the Si content reaches 10% in mole, extra bulk M3Si phase was observed. The precipitated silicides greatly improve the yield strength up to 1671 MPa. As the temperature increases, the strengthening effect of silicide becomes weaker, and almost disappeared at 1200 ℃. Nanoscale silicides can precipitate during high-temperature deformations. (VNbTiTa)97.5Si2.5 RHEA possesses an excellent combination of room-temperature ductility 34% and yield strength 505 MPa at 1000 ℃.",

keywords = "High-entropy alloys, High-temperature mechanical properties, Microstructure, Room temperature mechanical properties",

author = "Xu, {Z. Q.} and Ma, {Z. L.} and Y. Tan and M. Wang and Y. Zhao and Cheng, {X. W.}",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2022",

month = apr,

day = "15",

doi = "10.1016/j.jallcom.2021.163517",

language = "English",

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journal = "Journal of Alloys and Compounds",

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TY - JOUR

T1 - Effects of Si additions on microstructures and mechanical properties of VNbTiTaSix refractory high-entropy alloys

AU - Xu, Z. Q.

AU - Ma, Z. L.

AU - Tan, Y.

AU - Wang, M.

AU - Zhao, Y.

AU - Cheng, X. W.

PY - 2022/4/15

Y1 - 2022/4/15

N2 - (VNbTiTa)100-xSix (x = 0, 2.5, 5, 10) refractory high-entropy alloys (RHEAs) are investigated in this paper. The equal molar VNbTiTa RHEA exhibits a room-temperature yield strength of 704 MPa and good compressive ductility (fracture strain> 50%). Si additions can introduce BCC+M5Si3 eutectic formed at inter-dendrite areas, and when the Si content reaches 10% in mole, extra bulk M3Si phase was observed. The precipitated silicides greatly improve the yield strength up to 1671 MPa. As the temperature increases, the strengthening effect of silicide becomes weaker, and almost disappeared at 1200 ℃. Nanoscale silicides can precipitate during high-temperature deformations. (VNbTiTa)97.5Si2.5 RHEA possesses an excellent combination of room-temperature ductility 34% and yield strength 505 MPa at 1000 ℃.

AB - (VNbTiTa)100-xSix (x = 0, 2.5, 5, 10) refractory high-entropy alloys (RHEAs) are investigated in this paper. The equal molar VNbTiTa RHEA exhibits a room-temperature yield strength of 704 MPa and good compressive ductility (fracture strain> 50%). Si additions can introduce BCC+M5Si3 eutectic formed at inter-dendrite areas, and when the Si content reaches 10% in mole, extra bulk M3Si phase was observed. The precipitated silicides greatly improve the yield strength up to 1671 MPa. As the temperature increases, the strengthening effect of silicide becomes weaker, and almost disappeared at 1200 ℃. Nanoscale silicides can precipitate during high-temperature deformations. (VNbTiTa)97.5Si2.5 RHEA possesses an excellent combination of room-temperature ductility 34% and yield strength 505 MPa at 1000 ℃.

KW - High-entropy alloys

KW - High-temperature mechanical properties

KW - Microstructure

KW - Room temperature mechanical properties

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U2 - 10.1016/j.jallcom.2021.163517

DO - 10.1016/j.jallcom.2021.163517

M3 - Article

AN - SCOPUS:85122149955

SN - 0925-8388

VL - 900

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

M1 - 163517

ER -

Effects of Si additions on microstructures and mechanical properties of VNbTiTaSi_x refractory high-entropy alloys

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Keywords

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