Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K

Wanchuck Woo; Muhammad Naeem; Jae-Suk Jeong; Cheol-Min Lee; Stefanus Harjo; Takuro Kawasaki; Haiyan He; Xun-Li Wang

doi:10.1016/j.msea.2020.139224

Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K

Wanchuck Woo^*
, Muhammad Naeem
, Jae-Suk Jeong
, Cheol-Min Lee
, Stefanus Harjo
, Takuro Kawasaki
, Haiyan He
, Xun-Li Wang

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

75 Citations (Scopus)

Abstract

To elucidate deformation behavior behind the exceptional mechanical properties of CrCoNi based medium entropy alloys, the deformation related microstructural parameters were determined by using in situ neutron diffraction and peaks profile analysis methods. Superior tensile strength and elongation of the CrCoNi alloy is relevant to higher twin fault probability (P_tw, up to 3.8%) and dislocation density (ρ, up to 9.7 x 10¹⁵ m⁻²) compared to those (1.3% and 3.4 x 10¹⁵ m⁻², respectively) of the CrCoNiFe at 293K. Meanwhile, at 140K, the P_tw of the CrCoNiFe significantly increased up to 4.4% with the stable ρ of ~5.0 x 10¹⁵ m⁻² and its mechanical properties overwhelm those of the CrCoNi at 273K. Such twinning dominant deformation mechanism at low temperature is also assured by lower stacking fault energy (SFE) of the CrCoNiFe (7.4 mJ/m²) at 140K compared to those of the CrCoNi (16.1 mJ/m²) and CrCoNiFe (32.1 mJ/m²) alloys at 293K.

Original language	English
Article number	139224
Journal	Materials Science and Engineering A
Volume	781
Online published	9 Mar 2020
DOIs	https://doi.org/10.1016/j.msea.2020.139224
Publication status	Published - 20 Apr 2020

Funding

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (No. NRF-2017M2A2A6A05017653 ), partly by JSPS Kakenhi 19H05180 , and J-PARC beamtime proposal of 2017B0267 . NM, HYH, and XLW acknowledge the support by the Research Grants Council of the Hong Kong Special Administrative Region (Project No. CityU 11216215 ) and by the Ministry of Science and Technology of the People's Republic of China (Grant No. 2016YFA0401501 ).

Research Keywords

Deformation twin
Dislocation density
Medium entropy alloy
Neutron diffraction
Stacking fault energy

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@article{757aab6863374e12b518a27a57787cfd,

title = "Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K",

abstract = "To elucidate deformation behavior behind the exceptional mechanical properties of CrCoNi based medium entropy alloys, the deformation related microstructural parameters were determined by using in situ neutron diffraction and peaks profile analysis methods. Superior tensile strength and elongation of the CrCoNi alloy is relevant to higher twin fault probability (Ptw, up to 3.8\%) and dislocation density (ρ, up to 9.7 x 1015 m−2) compared to those (1.3\% and 3.4 x 1015 m−2, respectively) of the CrCoNiFe at 293K. Meanwhile, at 140K, the Ptw of the CrCoNiFe significantly increased up to 4.4\% with the stable ρ of \textasciitilde{}5.0 x 1015 m−2 and its mechanical properties overwhelm those of the CrCoNi at 273K. Such twinning dominant deformation mechanism at low temperature is also assured by lower stacking fault energy (SFE) of the CrCoNiFe (7.4 mJ/m2) at 140K compared to those of the CrCoNi (16.1 mJ/m2) and CrCoNiFe (32.1 mJ/m2) alloys at 293K.",

keywords = "Deformation twin, Dislocation density, Medium entropy alloy, Neutron diffraction, Stacking fault energy",

author = "Wanchuck Woo and Muhammad Naeem and Jae-Suk Jeong and Cheol-Min Lee and Stefanus Harjo and Takuro Kawasaki and Haiyan He and Xun-Li Wang",

year = "2020",

month = apr,

day = "20",

doi = "10.1016/j.msea.2020.139224",

language = "English",

volume = "781",

journal = "Materials Science and Engineering A",

issn = "0921-5093",

publisher = "Elsevier Ltd.",

}

Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K. / Woo, Wanchuck; Naeem, Muhammad; Jeong, Jae-Suk et al.
In: Materials Science and Engineering A, Vol. 781, 139224, 20.04.2020.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

TY - JOUR

T1 - Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K

AU - Woo, Wanchuck

AU - Naeem, Muhammad

AU - Jeong, Jae-Suk

AU - Lee, Cheol-Min

AU - Harjo, Stefanus

AU - Kawasaki, Takuro

AU - He, Haiyan

AU - Wang, Xun-Li

PY - 2020/4/20

Y1 - 2020/4/20

N2 - To elucidate deformation behavior behind the exceptional mechanical properties of CrCoNi based medium entropy alloys, the deformation related microstructural parameters were determined by using in situ neutron diffraction and peaks profile analysis methods. Superior tensile strength and elongation of the CrCoNi alloy is relevant to higher twin fault probability (Ptw, up to 3.8%) and dislocation density (ρ, up to 9.7 x 1015 m−2) compared to those (1.3% and 3.4 x 1015 m−2, respectively) of the CrCoNiFe at 293K. Meanwhile, at 140K, the Ptw of the CrCoNiFe significantly increased up to 4.4% with the stable ρ of ~5.0 x 1015 m−2 and its mechanical properties overwhelm those of the CrCoNi at 273K. Such twinning dominant deformation mechanism at low temperature is also assured by lower stacking fault energy (SFE) of the CrCoNiFe (7.4 mJ/m2) at 140K compared to those of the CrCoNi (16.1 mJ/m2) and CrCoNiFe (32.1 mJ/m2) alloys at 293K.

AB - To elucidate deformation behavior behind the exceptional mechanical properties of CrCoNi based medium entropy alloys, the deformation related microstructural parameters were determined by using in situ neutron diffraction and peaks profile analysis methods. Superior tensile strength and elongation of the CrCoNi alloy is relevant to higher twin fault probability (Ptw, up to 3.8%) and dislocation density (ρ, up to 9.7 x 1015 m−2) compared to those (1.3% and 3.4 x 1015 m−2, respectively) of the CrCoNiFe at 293K. Meanwhile, at 140K, the Ptw of the CrCoNiFe significantly increased up to 4.4% with the stable ρ of ~5.0 x 1015 m−2 and its mechanical properties overwhelm those of the CrCoNi at 273K. Such twinning dominant deformation mechanism at low temperature is also assured by lower stacking fault energy (SFE) of the CrCoNiFe (7.4 mJ/m2) at 140K compared to those of the CrCoNi (16.1 mJ/m2) and CrCoNiFe (32.1 mJ/m2) alloys at 293K.

KW - Deformation twin

KW - Dislocation density

KW - Medium entropy alloy

KW - Neutron diffraction

KW - Stacking fault energy

UR - https://www.scopus.com/pages/publications/85081125432

UR - https://www.scopus.com/pages/publications/85081125432#tab=impact

U2 - 10.1016/j.msea.2020.139224

DO - 10.1016/j.msea.2020.139224

M3 - RGC 21 - Publication in refereed journal

AN - SCOPUS:85081125432

SN - 0921-5093

VL - 781

JO - Materials Science and Engineering A

JF - Materials Science and Engineering A

M1 - 139224

ER -

Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K

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GRF: Linking Crystallization Kinetics to Glass Forming Ability of Metallic Glasses

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Comparison of dislocation density, twin fault probability, and stacking fault energy between CrCoNi and CrCoNiFe medium entropy alloys deformed at 293 and 140K

Abstract

Funding

Research Keywords

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GRF: Linking Crystallization Kinetics to Glass Forming Ability of Metallic Glasses

Cite this