Effect of Ti Addition on the Microstructure and Property of FeAlCuCrNiMo0.6 High-Entropy Alloy

doi:10.1007/s40195-020-01019-x

Abstract

Abstract:

FeAlCuCrNiMo_0.6Ti_x (x = 0.2, 0.6, 0.8) high-entropy alloys were fabricated with flux-cored wire and surfaced on low-carbon steel by gas metal arc welding. The effect of Ti addition on the microstructures and properties of FeAlCuCrNiMo_0.6Ti_x HEAs surfacing layer was systematically studied. The results show that FeAlCuCrNiMo_0.6Ti_x HEAs surfacing layer exhibits a majority of BCC solid solution based on Fe-Cr phase and a small amount of MC phase. Microhardness and wear tests results show that the addition of Ti can significantly improve the microhardness and wear resistance of the surfacing layer. The microhardness of surfacing layer can reach up to 642 HV_0.5, which is about 2.8 times that of the substrate. Meanwhile, the wear mass loss is minimum. Electrochemical corrosion test results show that the addition of Ti can improve the corrosion resistance of surfacing layer, which is better than 304 stainless steel substrate. With the increase in Ti, the corrosion resistance increases first and then decreases. When the Ti content is 0.6, the self-corrosion current density of polarization curve is the smallest, the capacitive impedance radius of electrochemical impedance spectroscopy is the largest, and the corrosion resistance effect is the best.

Key words: High-entropy alloy, Surfacing, Flux-cored wire, Microstructure, Microhardness, Wear resistance, Electrochemical corrosion

Yunhai Su, Xuewei Liang, Yunqi Liu, Zhiyong Dai. Effect of Ti Addition on the Microstructure and Property of FeAlCuCrNiMo_0.6 High-Entropy Alloy[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(7): 957-967.

Figures/Tables 17

Table 1 Compositions of H08A steel strip and substrate (wt%)

	C	Si	Mn	S	P	Fe
H08A	0.03	0.01	0.30-0.55	0.013	0.011	Bal
Substrate	0.20	0.35	0.70	0.045	0.045	Bal

Table 2 Welding process parameters

Welding current (A)	Arc voltage (V)	Welding speed (cm/min)	Gas flow (L/min)
160	24	8	12

Table 3 Theoretical parameter values

Element	ΔS_mix (J·mol^-1 K^-1)	Δ (%)	ΔH_mix (kJ·mol^-1)	VEC
Ti_0.2	15.516	5.74	- 5.65	7.31
Ti_0.6	15.991	6.16	- 9.12	7.10
Ti_0.8	16.063	6.32	- 10.52	7.00
Ti_1.0	16.075	6.44	- 11.73	6.91

Fig. 1 Parameter values of FeAlCuCrNiMo0.6Tix HEAs

Fig. 2 X-ray diffraction patterns of FeAlCuCrNiMo0.6Tix HEAs: a overall diagram, b FCC phase diagram

Fig. 3 Microstructures and morphologies of the FeAlCuCrNiMo0.6Tix HEAs: a Ti0.2, b Ti0.6, c Ti0.8

Table 4 Chemical compositions of FeAlCuCrNiMo0.6Tix HEAs surfacing layer at various regions in Fig. 3 (at.%)

Alloys	Region	Fe	Al	Cu	Cr	Ni	Mo	Ti	C
Ti_0.2	Precipitates	25.99 s	7.35	2.70	1.56	2.35	0.69	48.29	11.07
	DR	70.11	2.39	5.83	9.35	9.60	1.12	1.60	-
	ID	63.92	3.30	10.63	7.24	7.47	4.08	55.73	-
Ti0.6	Precipitates	14.17	7.82	2.57	1.72	2.21	0.79	3.36	14.99
	DR	69.57	2.24	4.21	10.32	9.56	1.56	2.54	-
	ID	57.30	3.37	13.02	8.12	7.69	4.14	6.36	-
Ti0.8	Precipitates	10.92	8.53	1.65	1.74	1.34	0.47	62.47	12.86
	DR	67.11	2.88	6.42	10.33	9.13	1.43	2.70	-
	ID	62.01	3.16	9.15	8.06	7.49	3.98	6.15	-

Fig. 4 Qualitative element distribution EDS maps of FeAlCuCrNiMo0.6Ti0.8 HEAs

Fig. 5 EBSD texture maps and grain sizes of FeAlCuCrNiMo0.6Tix HEAs: a, b Ti0.2, c, d Ti0.6, e, f Ti0.8

Fig. 6 EBSD phase maps and histograms of phases within FeAlCuCrNiMo0.6Tix HEAs: a, b Ti0.2, c, d Ti0.6, e, f Ti0.8

Fig. 7 Microhardness distributions of FeAlCuCrNiMo0.6Tix HEAs

Fig. 8 Cross-sectional microstructure of FeAlCuCrNiMo0.6Ti0.8 HEA

Fig. 9 Comparison of microhardness and wear mass loss of FeAlCuCrNiMo0.6Tix HEAs

Fig. 10 Electrochemical polarization curves of FeAlCuCrNiMo0.6Tix HEAs

Table 5 Self-corrosion potential and current density of FeAlCuCrNiMo0.6Tix HEAs surfacing layer

HEA surfacing layer	Self-corrosion potential (V)	Self-corrosion current density (mA/cm²)
304 Stainless steel	- 0.9008	2.3549 × 10^-3
Ti_0.2	- 0.9437	1.9474 × 10^-3
Ti_0.6	- 1.03409	2.1276 × 10^-4
Ti_0.8	- 1.03038	3.9298 × 10^-4

Fig. 11 Nyquist plots of FeAlCuCrNiMo0.6Tix HEAs

Fig. 12 Corrosion morphologies of FeAlCuCrNiMo0.6Tix HEAs: a FeAlCuCrNiMo0.6Ti0.6, b 304 stainless steel

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