Microstructure Evolution and Mechanical Properties of Rapid Solidified AlCoCrFeNi2.1 Eutectic High Entropy Alloy

doi:10.11901/1005.3093.2019.069

Chinese Journal of Materials Research

2019, Vol. 33

Issue (9): 650-658 DOI: 10.11901/1005.3093.2019.069

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Microstructure Evolution and Mechanical Properties of Rapid Solidified AlCoCrFeNi_2.1 Eutectic High Entropy Alloy

CAO Leigang¹,ZHU Lin¹,ZHANG Leilei¹,WANG Hui²,CUI Yan¹(

),YANG Yue¹,LIU Fengbin¹

1. School of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144, China
2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

Cite this article:

CAO Leigang,ZHU Lin,ZHANG Leilei,WANG Hui,CUI Yan,YANG Yue,LIU Fengbin. Microstructure Evolution and Mechanical Properties of Rapid Solidified AlCoCrFeNi_2.1 Eutectic High Entropy Alloy. Chinese Journal of Materials Research, 2019, 33(9): 650-658.

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Abstract

Rods with different diameters and ribbons of the multi-component eutectic high-entropy alloy AlCoCrFeNi_2.1 were prepared by vacuum rapid solidification facility. The effect of cooling rate on microstructure and mechanical properties of the alloy was investigated. The results show that all of the alloys consist of FCC and B2 phases. Alloy rods of different diameters present a typical eutectic structure, with the presence of the cellular microstructure at certain sites of axial surface regions. The decrease of the diameter raises the cooling rate of the casting rod, resulting in the decrease of lamellar spacing (λ) of the regular eutectic structure and the increase of yield strength. As the diameter decreases from 8 mm to 2 mm, the values of λ decrease from 530.4 to 357.0 μm in the axial surface regions and from 712.0 μm to 474.0 μm in the axial center regions, resulting in the increase of the yield strength from 690 MPa to 877 MPa. As far as the microstructure morphology of the alloy ribbons is concerned, it can be concluded that the microstructure of the alloy may evolves in the following sequence, namely, regular and irregular eutectic structure, cellular structure and dendrite structure as the cooling rate is increased.

Key words: metallic materials eutectic high entropy alloy rapid solidification microstructure

Received: 21 January 2019

ZTFLH:

TG244

Fund: Beijing Natural Science Foundation(2194074);National Key Research and Development Program of China(2017YFB0703102);Science and Technology Project of Beijing Municipal Education Commission(KM201910009005);Yuqing Talent Support Program of North China University of Technology(18XN012-081)

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	Leigang CAO
	Lin ZHU
	Leilei ZHANG
	Hui WANG
	Yan CUI
	Yue YANG
	Fengbin LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.069 OR https://www.cjmr.org/EN/Y2019/V33/I9/650

Fig.1 Microstructure of the arc-melted AlCoCrFeNi_2.1 alloy at low magnification (a) and high magnification (b)

Table 1 EDX results of the arc-melted AlCoCrFeNi_2.1 alloy and the phases

Fig.2 Microstructures of the surface (left) and center (right) regions of the AlCoCrFeNi_2.1 eutectic high-entropy alloy casting rods with different diameters. (a) and (b): 8 mm; (c) and (d): 5 mm; (e) and (f): 2 mm. (I) regular eutectic structure; (II) irregular eutectic structure; (III) cellular eutectic structure

Table 2 EDX results of the FCC and B2 phases in the surface and center regions of the casting rods with different diameters (%, atomic fraction)

Fig.3 Engineering compressive stress-strain curves for the AlCoCrFeNi_2.1 alloy rods with different diameters at room temperature

Fig.4 Average lamellar spacings of the regular structure observed in the surface and center regions of the casting rods with different diameters

Fig.5 Microstructure evolution of the AlCoCrFeNi_2.1 alloy ribbons: (a) the transition from dendrite struc-ture to cellular and then regular eutectic structure; (b) the transition from cellular eutectic structure to regular eutectic structure

Fig.6 XRD results from the contact and free surface of the AlCoCrFeNi_2.1 ribbons

Fig.7 Schematic diagram of Microstructure evolution of AlCoCrFeNi_2.1 eutectic high entropy alloy as the cooling rate is increased

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