Extremely high dislocation density and deformation pathway of CrMnFeCoNi high entropy alloy at ultralow temperature

Muhammad Naeem; Haiyan He; Stefanus Harjo; Takuro Kawasaki; Fan Zhang; Bing Wang; Si Lan; Zhenduo Wu; Yuan Wu; Zhaoping Lu; Chain T. Liu; Xun-Li Wang

doi:10.1016/j.scriptamat.2020.07.004

Extremely high dislocation density and deformation pathway of CrMnFeCoNi high entropy alloy at ultralow temperature

Muhammad Naeem, Haiyan He, Stefanus Harjo, Takuro Kawasaki, Fan Zhang, Bing Wang, Si Lan, Zhenduo Wu, Yuan Wu, Zhaoping Lu, Chain T. Liu, Xun-Li Wang^*

^*Corresponding author for this work

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

105 Citations (Scopus)

Abstract

The deformation behavior of CrMnFeCoNi high entropy alloy was investigated by in situ neutron diffraction at an ultralow temperature of 15 K. Analysis of the diffraction peak widths showed an extremely high dislocation density at 15 K, reaching ~10¹⁶ m⁻². In addition, the dislocation density was found to closely follow the development of texture caused by deformation. In contrast to deformation by dislocation slip at room temperature, the ultralow-temperature deformation also involved stacking faults, twinning and serrations. The deformation pathway at ultralow temperature is outlined which is responsible for the extraordinary strength–ductility combination.

Original language	English
Pages (from-to)	21-25
Journal	Scripta Materialia
Volume	188
Online published	13 Jul 2020
DOIs	https://doi.org/10.1016/j.scriptamat.2020.07.004
Publication status	Published - Nov 2020

Funding

M.N., H.H. and X.-L.W. acknowledge funding from the Research Grants Council of Hong Kong Special Administrative Region (CityU 11215917 ), the Croucher Foundation (CityU 9500034 ), the Shenzhen Science and Technology Innovation Committee (Grant No. JCYJ20170413140446951 ) and the Ministry of Science and Technology of China (Grant No. 2016YFA0401501 ). S.L. was supported by the National Natural Science Foundation of China (Grant No. 51871120 ) and the Natural Science Foundation of Jiangsu Province (Grant No. BK20171425 ). The neutron scattering experiments were conducted under proposal numbers 2016B0254 and 2017B0142 at BL19 TAKUMI, MLF, J-PARC.

Research Keywords

Dislocation density
High entropy alloy
Neutron diffraction
Plastic deformation
Stacking faults

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10.1016/j.scriptamat.2020.07.004

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@article{c0a2b521eaa94dd687a200726d12c142,

title = "Extremely high dislocation density and deformation pathway of CrMnFeCoNi high entropy alloy at ultralow temperature",

abstract = "The deformation behavior of CrMnFeCoNi high entropy alloy was investigated by in situ neutron diffraction at an ultralow temperature of 15 K. Analysis of the diffraction peak widths showed an extremely high dislocation density at 15 K, reaching ~1016 m−2. In addition, the dislocation density was found to closely follow the development of texture caused by deformation. In contrast to deformation by dislocation slip at room temperature, the ultralow-temperature deformation also involved stacking faults, twinning and serrations. The deformation pathway at ultralow temperature is outlined which is responsible for the extraordinary strength–ductility combination.",

keywords = "Dislocation density, High entropy alloy, Neutron diffraction, Plastic deformation, Stacking faults",

author = "Muhammad Naeem and Haiyan He and Stefanus Harjo and Takuro Kawasaki and Fan Zhang and Bing Wang and Si Lan and Zhenduo Wu and Yuan Wu and Zhaoping Lu and Liu, {Chain T.} and Xun-Li Wang",

year = "2020",

month = nov,

doi = "10.1016/j.scriptamat.2020.07.004",

language = "English",

volume = "188",

pages = "21--25",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Acta Materialia Inc",

}

TY - JOUR

T1 - Extremely high dislocation density and deformation pathway of CrMnFeCoNi high entropy alloy at ultralow temperature

AU - Naeem, Muhammad

AU - He, Haiyan

AU - Harjo, Stefanus

AU - Kawasaki, Takuro

AU - Zhang, Fan

AU - Wang, Bing

AU - Lan, Si

AU - Wu, Zhenduo

AU - Wu, Yuan

AU - Lu, Zhaoping

AU - Liu, Chain T.

AU - Wang, Xun-Li

PY - 2020/11

Y1 - 2020/11

N2 - The deformation behavior of CrMnFeCoNi high entropy alloy was investigated by in situ neutron diffraction at an ultralow temperature of 15 K. Analysis of the diffraction peak widths showed an extremely high dislocation density at 15 K, reaching ~1016 m−2. In addition, the dislocation density was found to closely follow the development of texture caused by deformation. In contrast to deformation by dislocation slip at room temperature, the ultralow-temperature deformation also involved stacking faults, twinning and serrations. The deformation pathway at ultralow temperature is outlined which is responsible for the extraordinary strength–ductility combination.

AB - The deformation behavior of CrMnFeCoNi high entropy alloy was investigated by in situ neutron diffraction at an ultralow temperature of 15 K. Analysis of the diffraction peak widths showed an extremely high dislocation density at 15 K, reaching ~1016 m−2. In addition, the dislocation density was found to closely follow the development of texture caused by deformation. In contrast to deformation by dislocation slip at room temperature, the ultralow-temperature deformation also involved stacking faults, twinning and serrations. The deformation pathway at ultralow temperature is outlined which is responsible for the extraordinary strength–ductility combination.

KW - Dislocation density

KW - High entropy alloy

KW - Neutron diffraction

KW - Plastic deformation

KW - Stacking faults

UR - http://www.scopus.com/inward/record.url?scp=85087761189&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85087761189&origin=recordpage

U2 - 10.1016/j.scriptamat.2020.07.004

DO - 10.1016/j.scriptamat.2020.07.004

M3 - RGC 21 - Publication in refereed journal

AN - SCOPUS:85087761189

SN - 1359-6462

VL - 188

SP - 21

EP - 25

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Extremely high dislocation density and deformation pathway of CrMnFeCoNi high entropy alloy at ultralow temperature

Abstract

Funding

Research Keywords

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CROU: Neutron Scattering Science and Technology

GRF: In-situ Neutron Diffraction Study to Understand the Microscopic Origin of Deformation in High-entropy Alloys

Cite this

Extremely high dislocation density and deformation pathway of CrMnFeCoNi high entropy alloy at ultralow temperature

Abstract

Funding

Research Keywords

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Projects

CROU: Neutron Scattering Science and Technology

GRF: In-situ Neutron Diffraction Study to Understand the Microscopic Origin of Deformation in High-entropy Alloys

Cite this