Superior cryogenic tensile properties of ultrafine-grained CoCrNi medium-entropy alloy produced by high-pressure torsion and annealing

被引：120

作者：

Sathiyamoorthi, Praveen ^{[1
,2
]}

Moon, Jongun ^{[1
,2
]}

Bae, Jae Wung ^{[1
,2
]}

Asghari-Rad, Peyman ^{[1
,2
]}

Kim, Hyoung Seop ^{[1
,2
,3
,4
]}

机构：

[1] Pohang Univ Sci & Technol POSTECH, Dept Mat Sci & Engn, Pohang 37673, South Korea

[2] Pohang Univ Sci & Technol POSTECH, Ctr High Entropy Alloys, Pohang 37673, South Korea

[3] Pohang Univ Sci & Technol POSTECH, GIFT, Pohang 37673, South Korea

[4] Yonsei Univ, Dept Mat Sci & Engn, Seoul 03722, South Korea

来源：

SCRIPTA MATERIALIA | 2019年 / 163卷

基金：

新加坡国家研究基金会;

关键词：

Ultrafine-grain; Cryogenic tensile strength; Nanotwins; CoCrNi alloy; High-pressure torsion; TEMPERATURE-DEPENDENCE; DEFORMATION; STRENGTH; STRESS; MECHANISM; DUCTILITY; BEHAVIOR; SIZE;

D O I：

10.1016/j.scriptamat.2019.01.016

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Ultrafine-grained materials with nanotwins are expected to produce a remarkable combination of strength and ductility. In the present study, ultrafine-grained CoCrNi medium-entropy alloy with nanotwins is fabricated by high-pressure torsion followed by annealing; and investigated for cryogenic tensile properties. The alloy exhibits superior cryogenic tensile properties with a tensile strength of similar to 2 GPa and tensile strain of similar to 27%. The cryogenic tensile strength of ultrafine-grained sample increased by 67% as compared to the cryogenic tensile strength of coarse-grained sample due to fine grain size, annealing nanotwins, residual dislocation density, and strong temperature dependence of yield strength. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：152 / 156

页数：5

共 43 条

[1] High temperature deformation in fine grained high entropy alloys
Chokshi, Atul H.
[J]. MATERIALS CHEMISTRY AND PHYSICS, 2018, 210 : 152 - 161
[2] Strength enhancement of high entropy alloy HfNbTaTiZr by severe plastic deformation
Cizek, J.
Hausild, P.
Cieslar, M.
Melikhova, O.
Vlasak, T.
Janecek, M.
Kral, R.
Harcuba, P.
Lukac, F.
Zyka, J.
Malek, J.
Moon, J.
Kim, H. S.
[J]. JOURNAL OF ALLOYS AND COMPOUNDS, 2018, 768 : 924 - 937
[3] Annealing twins in nanocrystalline fcc metals: A molecular dynamics simulation
Farkas, Diana
Bringa, Eduardo
Caro, Alfredo
[J]. PHYSICAL REVIEW B, 2007, 75 (18)
[4] A high-entropy alloy with hierarchical nanoprecipitates and ultrahigh strength
Fu, Zhiqiang
Jiang, Lin
Wardini, Jenna L.
MacDonald, Benjamin E.
Wen, Haiming
Xiong, Wei
Zhang, Dalong
Zhou, Yizhang
Rupert, Timothy J.
Chen, Weiping
Lavernia, Enrique J.
[J]. SCIENCE ADVANCES, 2018, 4 (10):
[5] Tensile properties of high- and medium-entropy alloys
Gali, A.
George, E. P.
[J]. INTERMETALLICS, 2013, 39 : 74 - 78
[6] Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures
Gludovatz, Bernd
Hohenwarter, Anton
Thurston, Keli V. S.
Bei, Hongbin
Wu, Zhenggang
George, Easo P.
Ritchie, Robert O.
[J]. NATURE COMMUNICATIONS, 2016, 7
[7] A fracture-resistant high-entropy alloy for cryogenic applications
Gludovatz, Bernd
Hohenwarter, Anton
Catoor, Dhiraj
Chang, Edwin H.
George, Easo P.
Ritchie, Robert O.
[J]. SCIENCE, 2014, 345 (6201) : 1153 - 1158
[8] The effect of grain size and grain orientation on deformation twinning in a Fe-22 wt.% Mn-0.6 wt.% C TWIP steel
Gutierrez-Urrutia, I.
Zaefferer, S.
Raabe, D.
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2010, 527 (15): : 3552 - 3560
[9] Hall-Petch relation and boundary strengthening
Hansen, N
[J]. SCRIPTA MATERIALIA, 2004, 51 (08) : 801 - 806
[10] Thermally activated deformation and the rate controlling mechanism in CoCrFeMnNi high entropy alloy
Hong, Sun Ig
Moon, Jongun
Hong, Soon Ku
Kim, Hyoung Seop
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2017, 682 : 569 - 576

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