Effect of Degree and Temperature of Pre-deformation on Deformation Mechanism and Subsequent Recrystallization Behavior of High-entropy Alloy CoCrFeMnNi

doi:10.11901/1005.3093.2018.437

Chinese Journal of Materials Research

2019, Vol. 33

Issue (6): 427-434 DOI: 10.11901/1005.3093.2018.437

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Effect of Degree and Temperature of Pre-deformation on Deformation Mechanism and Subsequent Recrystallization Behavior of High-entropy Alloy CoCrFeMnNi

Jian TU^1,²,Lei LIU¹,Shirun DING¹,Jianbo LI³,Zhiming ZHOU^1,²,Anping DONG⁴,Can HUANG^1,^2,³(

)

1. School of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China
2. Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology, Chongqing University of Technology, Chongqing 400054, China
3. School of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
4. Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China

Cite this article:

Jian TU,Lei LIU,Shirun DING,Jianbo LI,Zhiming ZHOU,Anping DONG,Can HUANG. Effect of Degree and Temperature of Pre-deformation on Deformation Mechanism and Subsequent Recrystallization Behavior of High-entropy Alloy CoCrFeMnNi. Chinese Journal of Materials Research, 2019, 33(6): 427-434.

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Abstract

The effect of the degree and temperature of pre-deformation on the deformation mechanism and subsequent recrystallization behavior of a high-entropy alloy CoCrFeMnNi, as well as, its microstructural evolution during deformation and post annealing treatments were investigated by using electron backscatter diffraction equipped in field emission gun scanning electron microscope. Results show that under low strain conditions, the effect of temperature on the microstructure of deformed alloy is not obvious, and the deformation mechanism is dominated mainly by dislocation slip. Moreover, at room temperature, with the increasing strain the deformation mechanisms dominated by dislocation slip and deformation twinning. In addition, in the condition of low temperature annealing, the effect of pre-deformation degree on recrystallization is not obvious, implying that the recrystallization is not easy to initiate. However, under the condition of high temperature annealing, both the refinement degree of recrystallization grains and the percentage of ∑3 boundaries increase with the increasing pre-deformation degree.

Key words: metallography microstructure electron back scattering diffraction high-entropy alloy

Received: 08 July 2018

ZTFLH:

TG113

Fund: National Natural Science Foundation of China(No. 51401039);National Natural Science Foundation of China(No. 51501026);Foundation and Frontier Research Program of Chongqing(No. cstc2017jcyjAX0381);Postdoctoral Science Foundation of Chongqing(No. Xm2017049);China Postdoctoral Science Foundation Funded Project(Nos. 2018M632250);China Postdoctoral Science Foundation Funded Project(Nos. 2017M621661)

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	Jian TU
	Lei LIU
	Shirun DING
	Jianbo LI
	Zhiming ZHOU
	Anping DONG
	Can HUANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.437 OR https://www.cjmr.org/EN/Y2019/V33/I6/427

Fig.1 As-cast microstructure of CoCrFeMnNi high entropy alloy (a) RD-TD plane; (b) RD-ND plane; (c₁-c₅) energy spectrum results showing Co, Cr, Fe, Mn and Ni elements

Fig.2 EBSD maps for hot deformation (H-15%) in (a) and room deformation (R-15%) in (b), including inverse pole figure (IPF), grain boundary map (GB) and misorientation angle distribution (MAD), Low angle boundaries (LAB), high angle boundaries (HAB) are outlined in gray and black

Fig.3 EBSD maps of sample deformed at room temperation with different degrees, including R-10%, R-30% and R-60% samples

Fig.4 EBSD maps of deformed samples at room temperation with 30% deformation degree under different annealing temperature, including RA-30%-400℃, RA-30%-700℃ and RA-30%-1000℃ samples

Fig.5 EBSD maps for deformed samples at room temperation with 60% deformation degree under different annealing temperature, including RA-60%-400℃, RA-60%-700℃ and RA-60%-1000℃ samples

Fig.6 Schematic illustrations of microstructural evolution forCoCrFeMnNi high entropy alloy (a) As-cast microstructure with coarse grains; (b) Heavy deformation microstructure; (c) Incomplete recrystallization microstructure; (d) Complete recrystallization microstructure

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