Investigation on Microstructure and Properties of Laser-Cladding FeCrNiTa<i><sub>x</sub></i> Eutectic Medium-Entropy Alloy Coating

Fuyu Ye; Jian Yang; Panjie Sun; Xingyu Wang; Chengyun Cui

doi:10.3788/CJL230593

Chinese Journal of Lasers, Volume. 50, Issue 20, 2002204(2023)

Investigation on Microstructure and Properties of Laser-Cladding FeCrNiTa_x Eutectic Medium-Entropy Alloy Coating

Fuyu Ye, Jian Yang, Panjie Sun, Xingyu Wang, and Chengyun Cui^*

Author Affiliations

School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China

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Figures & Tables(15)

Fig. 1. Microscopic morphology of FeCrNiTa_0.4 powder. (a) Powder cluster morphology; (b) individual particle morphology

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Fig. 2. XRD patterns of FeCrNiTa_x EMEACs

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Fig. 3. Micrographs of cross section and bonding zone of alloy coating. (a) Cross section; (b) bonding zone

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Fig. 4. SEM images of FeCrNiTa_x(x=0.2, 0.4, 0.6, 0.8) EMEACs. (a) Ta_0.2; (b) Ta_0.4; (c) Ta_0.6; (d) Ta_0.8

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Fig. 5. Distributions of elements in hypereutectic structure. (a) Image of hypereutectic structure; (b) Fe element; (c) Cr element; (d) Ni element; (e) Ta element

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Fig. 6. Microstructures of cross section of FeCrNiTa_0.4 EMEACs. (a) Top microstructure; (b) bottom microstructure

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Fig. 7. Microhardness curves and average hardness of FeCrNiTa_x(x=0,0.2,0.4,0.6,0.8) EMEACs. (a) Microhardness; (b) average hardness

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Fig. 8. Wear mass loss of FeCrNiTa_x(x=0, 0.2, 0.4, 0.6, 0.8) EMEACs and 304 stainless steel

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Fig. 9. Friction coefficients and average friction coefficients of 304 stainless steel and FeCrNiTa_x(x=0, 0.2, 0.4, 0.6, 0.8) EMEACs. (a) Friction coefficients; (b) average friction coefficients

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Fig. 10. Wear track morphologies. (a)(b) Substrate; (c)-(l) FeCrNiTa_x(x=0, 0.2, 0.4, 0.6, 0.8) EMEACs

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Table 1. Chemical compositions of 304 stainless steel (mass fraction, %)
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Table 1. Chemical compositions of 304 stainless steel (mass fraction, %)
Element C Mn Si S Ni Cr P Fe
Value 0.070 1.527 0.477 0.007 8.000 18.020 0.036 Bal.

Table 2. Chemical compositions of FeCrNiTa_x EMEACs
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Table 2. Chemical compositions of FeCrNiTa_x EMEACs
x Mass fraction /%
Fe Cr Ni Ta
0 33.535 31.222 35.243 0
0.2 27.548 25.648 28.952 17.851
0.4 23.374 21.763 24.567 30.295
0.6 20.300 18.900 21.335 39.465
0.8 17.940 16.703 18.855 46.503

Table 3. Values of mixing enthalpy of element pairs and atomic radius
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Table 3. Values of mixing enthalpy of element pairs and atomic radius
Element Atomic radius /nm Value of mixing enthalpy /（K·J·mol^-1）
Fe Cr Ni Ta
Fe 0.124 0 -1 -2 -15
Cr 0.125 - 0 -7 -24
Ni 0.125 - - 0 -29
Ta 0.143 - - - 0

Table 4. Elementary compositions at different points on FeCrNiTa_x EMEACs wear tracks
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Table 4. Elementary compositions at different points on FeCrNiTa_x EMEACs wear tracks
point Atomic fraction / %
Fe Cr Ni Ta Mn O
A 45.26 6.83 2.59 - 1.06 44.25
B 18.96 1.43 11.87 - - 67.74
C 21.78 13.80 7.79 4.93 - 51.71
D 15.62 6.60 3.33 1.36 - 73.09
E 28.60 7.87 3.76 2.72 - 57.06
F 24.12 16.90 9.56 3.64 - 45.77

Table 5. Thermodynamic parameters of FeCrNiTa_x_EMEAs
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Table 5. Thermodynamic parameters of FeCrNiTa_x_EMEAs
x $Δ S_{m i x}$ /（J·mol^-1·K^-1） $Δ H_{m i x}$ /（K·J·mol^-1） $Ω$ $δ$ /% $V_{V E C}$
0 9.13 -4.44 3.92 1.29 8
0.2 10.51 -9.22 2.27 3.54 7.81
0.4 11.07 -12.87 1.78 4.67 7.65
0.6 11.36 -15.68 1.55 5.35 7.50
0.8 11.49 -17.84 1.41 5.81 7.37

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Fuyu Ye, Jian Yang, Panjie Sun, Xingyu Wang, Chengyun Cui. Investigation on Microstructure and Properties of Laser-Cladding FeCrNiTa_x Eutectic Medium-Entropy Alloy Coating[J]. Chinese Journal of Lasers, 2023, 50(20): 2002204

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