A Novel, Amorphous, Non-equiatomic FeCrAlCuNiSi High-Entropy Alloy with Exceptional Corrosion Resistance and Mechanical Properties

doi:10.1007/s40195-019-00977-1

金属学报英文版 ›› 2020, Vol. 33 ›› Issue (8): 1057-1063.DOI: 10.1007/s40195-019-00977-1

收稿日期:2019-08-15 修回日期:2019-10-02 出版日期:2020-08-10 发布日期:2020-08-06

A Novel, Amorphous, Non-equiatomic FeCrAlCuNiSi High-Entropy Alloy with Exceptional Corrosion Resistance and Mechanical Properties

Xigang Yang¹, Yun Zhou², Ruihua Zhu¹, Shengqi Xi¹(), Cheng He¹, Hongjing Wu¹, Yuan Gao¹

¹State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, China
²School of Medical Information and Engineering, Southwest Medical University, Luzhou, 646000, China

Received:2019-08-15 Revised:2019-10-02 Online:2020-08-10 Published:2020-08-06
Contact: Shengqi Xi

摘要/Abstract

Abstract:

The exceptional corrosion resistance and mechanical properties of high-entropy metallic glasses (HE-MGs) are highly desirable for diverse critical applications. However, a long-standing problem of these alloys is that their alloy design approaches are based on limited equiatomic or near-equiatomic ratios. In this study, a novel senary alloy (non-equiatomic Fe₃Cr₂Al₂CuNi₄Si₅) with amorphous structure was prepared. This alloy exhibited exceptional corrosion resistance and Vickers hardness as high as ~ 1150 Hv at room temperature. The processing route involved amorphous powder molding via a mechanical alloying and ultrahigh pressure consolidation technique, resulting in an optimal microstructure of amorphous structure with nanoparticles uniformly distributed in the matrix alloy. This approach can effectively inhibit the crystallization of amorphous structure, thus providing a general pathway for manufacturing next-generation non-equiatomic HE-MGs with both exceptional corrosion resistance and strength.

Key words: Alloying, Metallic glasses, Corrosion resistance, Mechanical, lloying, High-entropy metallic glasses

. [J]. 金属学报英文版, 2020, 33(8): 1057-1063.

Xigang Yang, Yun Zhou, Ruihua Zhu, Shengqi Xi, Cheng He, Hongjing Wu, Yuan Gao. A Novel, Amorphous, Non-equiatomic FeCrAlCuNiSi High-Entropy Alloy with Exceptional Corrosion Resistance and Mechanical Properties[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(8): 1057-1063.

图/表 6

Fig. 1 XRD patterns of Fe3Cr2Al2CuNi4Si5 HEA powders in different milling time

Fig. 2 SEM images of Fe3Cr2Al2CuNi4Si5 HEA powders milled in different time: a 4 h, b 8 h, c 10 h, d 20 h, e 30 h, f 40 h, g SEM image of the 30-h milled powders and h EDS spectrum corresponding to g

Table 1 Chemical composition of the Fe3Cr2Al2CuNi4Si5 powders (at.%)

Process	Fe	Cr	Al	Cu	Ni	Si
Nominal composition	17.7	11.8	11.8	5.9	23.5	29.3
30 h MA	18.2	12.1	11.4	6.3	23.1	28.9

Fig. 3 Microstructural characterizations of Fe3Cr2Al2CuNi4Si5 HE-MGs: a XRD patterns of the present HE-MG powders and ultrahigh pressure consolidated HE-MG sample; b SEM image of the Fe3Cr2Al2CuNi4Si5 HE-MG; c nanoparticles in the Fe3Cr2Al2CuNi4Si5 HE-MG; d microstructure of Fe3Cr2Al2CuNi4Si5 HE-MG, the inset shows the selected-area diffraction pattern of the matrix; e nanoparticles in the Fe3Cr2Al2CuNi4Si5 HE-MG, the inset shows the selected-area diffraction pattern of the nanoparticles; f TEM-EDS elemental mapping of six principal elements

Table 2 Vickers hardness of HEAs at room temperature

Alloys	Process	Hardness (Hv)	Refs.
Fe₃Cr₂Al₂CuNi₄Si₅	MA + UHPC	1150	This work
Fe₂₅Al_7.5Cu_17.5Ni₂₅Co₂₅	SPS	454	[9]
FeCrAl_0.9NiCo	Arc-melting	527	[15]
FeCrAl_0.5NiCo_0.3C_0.2	SPS	617	[23]

Fig. 4 Electrochemical measurement of Fe3Cr2Al2CuNi4Si5 HE-MGs in 3.5% NaCl solution: a potentiodynamic polarization curves of Fe3Cr2Al2CuNi4Si5 HE-MG and 304 stainless steel; b Nyquist plots of Fe3Cr2Al2CuNi4Si5 HE-MG and 304 stainless steel

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A Novel, Amorphous, Non-equiatomic FeCrAlCuNiSi High-Entropy Alloy with Exceptional Corrosion Resistance and Mechanical Properties

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