Improved Plasticity of Fe25Co25Ni25(Si0.3B0.7)25 High Entropy Bulk Metallic Glass through the Addition of Cu

doi:10.1007/s40195-022-01457-9

Abstract

Abstract:

This work was focused on enhancement in the plasticity of Fe₂₅Co₂₅Ni₂₅(Si_0.3B_0.7)₂₅ high entropy bulk metallic glass (HE-BMG) by adding minor Cu (0-1.2, in at.%). It is found that the appropriate addition of Cu can efficiently improve the plasticity of the present HE-BMG while the excessive addition of Cu will deteriorate again the plasticity, and especially, the plastic strain of the present HE-BMG is improved from 0.8% for the Cu-free alloy to 4.7% for the 0.3 at.% Cu-added alloy. The transmission electron microscopy observation shows that there are many α-Fe (Co, Ni) clusters with sizes of less than 5 nm dispersed in the glassy matrix in the 0.3 and 0.6 at.% Cu-added alloys, which may account for the significant improvement in the plasticity of the two alloys, and further increase in Cu content more than 0.9 at.% leads to the precipitation of α-Fe (Co, Ni) and Fe (Co, Ni) B compound grains with diameters of tens of nanometers, in which the plasticity of the present HE-BMGs has deteriorated rapidly.

Key words: High entropy alloys, Bulk metallic glasses, Glass forming ability, Nano-crystallization, Plasticity, Microstructure

Xueru Fan, Lei Xie, Qiang Li, Chuntao Chang, Hongxiang Li. Improved Plasticity of Fe₂₅Co₂₅Ni₂₅(Si_0.3B_0.7)₂₅ High Entropy Bulk Metallic Glass through the Addition of Cu[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(3): 417-425.

Figures/Tables 7

Fig. 1 XRD pattern a and outer morphologies b of as-cast [Fe0.25Co0.25Ni0.25(Si0.3B0.7)0.25]100-xCux (x = 0-1.2, in at.%) HE-BMG rods with the corresponding critical diameter

Fig. 2 DSC curves of as-cast [Fe0.25Co0.25Ni0.25(Si0.3B0.7)0.25]100-xCux (x = 0-1.2, in at.%) HE-BMGs: a crystallization process of HE-BMGs; b melting processes of HE-BMGs

Fig. 3 Room temperature compressive stress-strain curves of the as-cast [Fe0.25Co0.25Ni0.25(Si0.3B0.7)0.25]100-xCux (x = 0-1.2, in at.%) HE-BMG rod samples with a diameter of 1.5 mm

Table 1 Thermal, mechanical and magnetic properties of the [Fe0.25Co0.25Ni0.25(Si0.3B0.7)0.25]99.7Cu0.3 HE-BMG together with some selected (Fe, Co, Ni)-based HE-BMGs and Fe-based BMGs

Composition (at.%)	T_g (K)	ΔT_x (K)	d_c (mm)	σ_y (MPa)	ε_p (%)	J_s (T)
Cu = 0.0 (This work)	788	25	2.8	3300	0.8	0.79
Cu = 0.3 (This work)	786	19	2.5	3489	4.7	0.82
Cu = 0.6 (This work)	784	19	2.4	3515	3.1	0.83
Cu = 0.9 (This work)	783	17	2.0	3330	2.0	0.83
Cu = 1.2 (This work)	782	14	2.0	3065	2.0	0.84
(Fe_1/3Co_1/3Ni_1/3)₈₀(P_1/2B_1/2)₂₀ [35]	686	26	2.0	3000	4.0	0.90
Fe₂₅Co₂₅Ni₂₅(P_0.4C_0.1B_0.3Si_0.2)₂₅ [11]	720	39	1.5	-	-	0.83
Fe₂₅Co₂₅Ni₂₅(P_0.4C_0.2B_0.2Si_0.2)₂₅ [11]	705	40	2.0	3076	1.9	0.80
Fe₂₅Co₂₅Ni₂₅(P_0.3C_0.3B_0.4)₂₅ [32]	702	47	1.0	3210	0.3	0.80
Fe₂₅Co₂₅Ni₂₅(P_0.5C_0.3B_0.2)₂₅ [32]	674	56	1.0	2850	1.2	0.86
Fe₂₅Co₂₅Ni₂₅(B_0.7Si_0.3)₂₅ [33]	767	40	1.5	3624	1.7	0.87
Fe₂₅Co₂₅Ni₂₅(B_0.6Si_0.4)25 [33]	771	37	1.0	3239	3.1	0.84
(Fe_0.76Si_0.096B_0.084P_0.06)_99.9Cu_0.1 [24]	785	46	2.5	3300	3.1	-
(Fe_0.76Si_0.096B_0.084P_0.06)_99.7Cu_0.3 [26]	781	47	2.0	-	2.5	-
(Fe_0.34Co_0.34Nb_0.06B_0.27)_99.9Cu_0.1 [29]	-	-	2.5	4810	3.7	-
Fe_79.7Cu_0.3P₁₃C₇ [40]	673	21	2.0	2360	4.0	1.43
(Fe_0.71Nb_0.06B_0.23)_99.5Cu_0.5 [28]	748	54	-	3755	4.5	1.42

Fig. 4 SEM images of fracture surface for as-cast [Fe0.25Co0.25Ni0.25(Si0.3B0.7)0.25]100-xCux (x = 0-1.2, in at.%) HE-BMGs specimens with 1.5 mm in diameter after compression test. (a-d) Surface appearance and enlarged morphologies of the failure sample: a x = 0, b x = 0.3, c x = 0.6, d x = 1.2; b1 lateral view of the deformed surface before fracture, x = 0.3

Fig. 5 Hysteresis loops of the as-cast [Fe0.25Co0.25Ni0.25(Si0.3B0.7)0.25]100-xCux (x = 0-1.2, in at.%) HE-BMG samples at room temperature a, the inset shows the enlarged view of hysteresis curves b

Fig. 6 High-resolution TEM images and the corresponding SAED patterns of the [Fe0.25Co0.25Ni0.25(Si0.3B0.7)0.25]100-xCux (x = 0-1.2, in at.%) HE-BMG rod specimens with the diameter of 1.5 mm: a x = 0, b x = 0.3, c x = 0.6 and d x = 1.2

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Improved Plasticity of Fe₂₅Co₂₅Ni₂₅(Si_0.3B_0.7)₂₅ High Entropy Bulk Metallic Glass through the Addition of Cu

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