Microstructure and Mechanical Properties of High-entropy Alloys (FeNiCoCr)100-x Al x (x=0, 5) Prepared by Hot-pressing Sintering

doi:10.11901/1005.3093.2021.383

Chinese Journal of Materials Research

2022, Vol. 36

Issue (11): 871-880 DOI: 10.11901/1005.3093.2021.383

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Microstructure and Mechanical Properties of High-entropy Alloys (FeNiCoCr)_100-_x Al _x (x=0, 5) Prepared by Hot-pressing Sintering

WANG Peijin¹^,², AI Taotao¹^,²(

), LIAO Zhongni¹^,², ZHAO Kun¹, LI Wenhu¹^,², KOU Lingjiang¹^,², ZHAO Zhongguo¹^,², ZOU Xiangyu¹^,²

^1.School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, China
^2.National & Local Joint Engineering Laboratory for Environmental Protection Technology for Comprehensive Utilization of Slag, Shaanxi University of Technology, Hanzhong 723000, China

Cite this article:

WANG Peijin, AI Taotao, LIAO Zhongni, ZHAO Kun, LI Wenhu, KOU Lingjiang, ZHAO Zhongguo, ZOU Xiangyu. Microstructure and Mechanical Properties of High-entropy Alloys (FeNiCoCr)_100-_x Al _x (x=0, 5) Prepared by Hot-pressing Sintering. Chinese Journal of Materials Research, 2022, 36(11): 871-880.

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Abstract

The high-entropy alloys (FeNiCoCr)_100-_x Al _x (x=0, 5) were prepared via a two-step process i.e., low-energy ball milling and then vacuum hot-pressing sintering, while the alloys were post-aged, afterwards, their microstructure and mechanical properties were assessed. The results show that the microstructure of both the as-sintered and the aged alloys composed of fcc-phase and a small amount of bcc phase, but twins presented in the fcc phase, and the proportion of twins for the alloy without Al was relatively high. The alloy with Al had relatively high bcc phase, and many small-angle grain boundaries appeared after aging treatment. The aged FeNiCoCr alloy has the best comprehensive performance, with a compressive true yield strength of 545 MPa. Moreover, the bending strength and the fracture toughness of the aged FeNiCoCr alloy reached 1342 MPa and 32.5 MPa·m^1/2. The excellent mechanical properties were attributed to the generation of annealing twins in the fcc-phase and the precipitation of the bcc-phase.

Key words: metallic materials high-entropy alloys hot-pressing sintering microstructure mechanical properties twins

Received: 26 June 2021

ZTFLH:

TG146

Fund: National Natural Science Foundation of China(51671116)

About author: AI Taotao, Tel: (0916)2641880, E-mail: aitaotao0116@126.com

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	Peijin WANG
	Taotao AI
	Zhongni LIAO
	Kun ZHAO
	Wenhu LI
	Lingjiang KOU
	Zhongguo ZHAO
	Xiangyu ZOU

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.383 OR https://www.cjmr.org/EN/Y2022/V36/I11/871

Fig.1 XRD spectra of (FeNiCoCr)_100-_x Al _x (x=0, 5) high-entropy alloys before and after aging

Fig.2 EDS element maps of (FeCoNiCr)_100-_x Al _x (x=0, 5) high-entropy alloys Al0 (a, b) and Al5 (c, d) before aging (a, c) and after aging (b, d)

Fig.3 EBSD maps of (FeNiCoCr)_100-_x Al _x (x=0, 5) high-entropy alloys Al0 (a, b) and Al5 (c, d) before aging (a, c) and after aging (b, d) (a1~d1) phase maps, (a2~d2) inverse pole figure (IPF) maps, (a3~d3) grain boundaries and phase boundaries maps (The black line represents high-angle grain boundaries, the red line represents small-angle grain boundaries, and the blue line represents phase boundaries), (a4~d4) KAM diagram, (a5~d5) diagram of grain boundaries and twin boundaries in FCC phases (The black line represents phase boundaries, and the red line represents 60°<111> twin boundaries)

Fig.4 EBSD diagram of sintered FeNiCoCr high-entropy alloys (a) orientation imaging image, (b) KAM image corresponding to image (a), and (c) twin boundary orientation difference image

Fig.5 Misorientation angle distribution diagram (a1~d1) and grain size distribution map (a2~d2) of the (FeNiCoCr)_100-_x Al _x (x=0, 5) high-entropy alloys. Al0 before aging (a1~a2), Al0 after aging (b1~b2), Al5 before aging (c1~c2) and Al5 after aging (d1~d2)

Fig.6 Fracture morphologies of (FeCoNiCr)_100-_x Al _x (x=0, 5) high-entropy alloys after bending tests Al0 before aging (a), Al0 after aging (b), Al5 before aging (c), and Al5 after aging (d)

Fig.7 Compression true stress-strain curves of (FeNi-CoCr)_100-_x Al _x (x=0, 5) high-entropy alloys before and after aging

Fig.8 (a) Flexural strength, fracture toughness, and (b) hardness of (FeNiCoCr)_100-_x Al _x (x=0, 5) high-entropy alloys before and after aging

Table 1 Differences in microstructure and mechanical properties of FeNiCoCr alloy prepared by hot pressing sintering and arc melting

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