Design Fe-based Eutectic Medium-Entropy Alloys Fe2NiCrNbx

doi:10.1007/s40195-021-01234-0

Abstract

Abstract:

High-entropy alloys have attracted broad research interests due to their unique and intriguing mechanical properties. As a category of high-entropy alloys, eutectic high-entropy alloys combine the advantages of eutectic and high-entropy alloys, with excellent mechanical properties and casting properties. Some eutectic high-entropy alloys have been developed and shown exciting properties. In this paper, based on the physical metallurgy of eutectic high-entropy alloy, medium-entropy alloy Fe₂NiCrNb_x was designed. The as-cast alloy is composed of FCC and Laves phases, Nb element promotes the formation of primary Laves phase, and the hardness of the alloy increases with the increase in Nb element. Among the four alloys, the eutectic chemical composition at eutectic point is Fe₂NiCrNb_0.34; the alloy has a good strength and plastic balance. The ultimate comprehensive strength is 2267MPa, and the fracture strain is 30.8%. The experiment data and analyses identified the eutectic points and the excellent mechanical behavior. Moreover, the expensive Co element was replaced by Fe element. This cheap medium-entropy alloy has promising prospect in the consideration of the cost performance ratio.

Key words: Eutectic medium-entropy alloy, Microstructure, Mechanical properties

Jiafen Song, Zishu Chai, Jian Zheng, Qingfeng Wu, Feng He, Zenan Yang, Junjie Li, Jincheng Wang, Haiou Yang, Zhijun Wang. Design Fe-based Eutectic Medium-Entropy Alloys Fe₂NiCrNb_x[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(8): 1103-1108.

Figures/Tables 8

Fig. 1 Phase selection of medium-entropy alloy in Fe2NiCrNbx: a Nb0.1, b Nb0.2, c Nb0.34, d Nb0.5

Fig. 2 SEM images of Fe2NiCrNbx: a x?=?0.1, b x?=?0.2, c x?=?0.34, d x?=?0.5

Fig. 3 XRD analyses of as-cast Fe2NiCrNbx alloys

Table 1 Chemical compositions of as-cast Fe2NiCrNbx alloys (at%)

	Cr	Fe	Ni	Nb
FCC in Fe₂NiCrNb_0.2	25.70	48.77	23.19	2.35
Laves in Fe₂NiCrNb_0.5	15.14	34.13	13.89	36.85

Fig. 4 Variations of hardness and Laves volume fraction of Fe2NiCrNbx alloys with Nb content

Fig. 5 Compressive engineering stress-strain curves of Fe2NiCrNbx alloys at room temperature

Table 2 Mechanical properties of eutectic medium-entropy alloys

Alloys	Hardness (HV)	Yield strength (MPa)	Fracture strength (MPa)	Fracture strain (%)
Nb0.1	173	364.8	2207	-
Nb0.2	242	635.2	2407	-
Nb0.34	356	988.7	2267	30.8
Nb0.5	417	939.9	1797	21.8

Fig. 6 Room temperature compression properties of other alloys

References 22

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Design Fe-based Eutectic Medium-Entropy Alloys Fe₂NiCrNb_x

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