Friction stress and Hall-Petch relationship in CoCrNi equi-atomic medium entropy alloy processed by severe plastic deformation and subsequent annealing

被引：417

作者：

Yoshida, Shuhei ^{[1
]}

Bhattacharjee, Tilak ^{[1
,2
]}

Bai, Yu ^{[1
,2
]}

Tsuji, Nobuhiro ^{[1
,2
]}

机构：

[1] Kyoto Univ, Dept Mat Sci & Engn, Sakyo Ku, Kyoto 6068501, Japan

[2] Kyoto Univ, Elements Strategy Initiat Struct Mat ESISM, Sakyo Ku, Kyoto 6068501, Japan

来源：

SCRIPTA MATERIALIA | 2017年 / 134卷

关键词：

Hall-Petch effect; Grain refining; Severe plastic deformation (SPD); Local lattice distortion; MECHANICAL-PROPERTIES; PHASE-STABILITY; STRENGTH; NI; ALUMINUM; FAMILY; STRAIN;

D O I：

10.1016/j.scriptamat.2017.02.042

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The present work focuses on the friction stress and the Hall-Petch relationship in CoCrNi equi-atomic medium entropy alloy (MEA). The CoCrNi equi-atomic MEA and a Ni-40Co alloy were processed by high-pressure torsion and subsequent annealing. The specimens with fully-recrystallized microstructure with different grain sizes ranging from 199 nm to 111 mu m were obtained. The Hall-Petch plot of the yield strength of the present specimens indicated that the friction stress of the CoCrNi MEA was much higher than Ni-40Co and pure metals, suggesting that the local lattice distortion in the equi-atomic alloy played an important role for the dislocation activity. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：33 / 36

页数：4

共 29 条

[1]

[Anonymous], 2009, IMAGE CORRELATION SH, DOI DOI 10.1007/978-0-387-78747-3

[2] Hall-Petch description of nanopolycrystalline Cu, Ni and Al strength levels and strain rate sensitivities [J].

Armstrong, R. W. .

PHILOSOPHICAL MAGAZINE, 2016, 96 (29) :3097-3108

[3] Strength prediction in NiCo alloys - The role of composition and nanotwins [J].

Chowdhury, P. ;

Sehitoglu, H. ;

Maier, H. J. ;

Rateick, R. .

INTERNATIONAL JOURNAL OF PLASTICITY, 2016, 79 :237-258

[4] Six decades of the Hall-Petch effect - a survey of grain-size strengthening studies on pure metals [J].

Cordero, Z. C. ;

Knight, B. E. ;

Schuh, C. A. .

INTERNATIONAL MATERIALS REVIEWS, 2016, 61 (08) :495-512

[5] Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures [J].

Gludovatz, Bernd ;

Hohenwarter, Anton ;

Thurston, Keli V. S. ;

Bei, Hongbin ;

Wu, Zhenggang ;

George, Easo P. ;

Ritchie, Robert O. .

NATURE COMMUNICATIONS, 2016, 7

[6] THE DEFORMATION AND AGEING OF MILD STEEL .3. DISCUSSION OF RESULTS [J].

HALL, EO .

PROCEEDINGS OF THE PHYSICAL SOCIETY OF LONDON SECTION B, 1951, 64 (381) :747-753

[7] EFFECT OF GRAIN-SIZE AND STRAIN ON TENSILE FLOW-STRESS OF ALUMINUM AT ROOM-TEMPERATURE [J].

HANSEN, N .

ACTA METALLURGICA, 1977, 25 (08) :863-869

[8] Wear resistance and high-temperature compression strength of Fcc CuCoNiCrAl0.5Fe alloy with boron addition [J].

Hsu, CY ;

Yeh, JW ;

Chen, SK ;

Shun, TT .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2004, 35A (05) :1465-1469

[9] Hall-Petch behaviour of Ni polycrystals with a few grains per thickness [J].

Keller, Clement ;

Hug, Eric .

MATERIALS LETTERS, 2008, 62 (10-11) :1718-1720

[10] An assessment on the future development of high-entropy alloys: Summary from a recent workshop [J].

Lu, Z. P. ;

Wang, H. ;

Chen, M. W. ;

Baker, I. ;

Yeh, J. W. ;

Liu, C. T. ;

Nieh, T. G. .

INTERMETALLICS, 2015, 66 :67-76

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