Fatigue behavior of CoCrFeMnNi high-entropy alloy under fully reversed cyclic deformation

doi:10.1016/j.jmst.2018.09.068

Abstract

Abstract:

Bulk ultrafine-grained (UFG) CoCrFeMnNi high-entropy alloy (HEA) with fully recrystallized microstructure was processed by cold rolling and annealing treatment. The high-cycle fatigue behaviors of the UFG HEA and a coarse-grained (CG) counterpart were investigated under fully reversed cyclic deformation. The fatigue strength of the UFG HEA can be significantly enhanced by refining the grain size. However, no grain coarsening was observed in the UFG HEA during fatigue tests. Mechanisms for the superior mechanical properties of the UFG HEA were explored.

Key words: High-entropy alloy (HEA), Ultrafine-grain (UFG), High-cycle fatigue, Recrystallization, Grain size, Fatigue strength

Y.Z. Tian, S.J. Sun, H.R. Lin, Z.F. Zhang. Fatigue behavior of CoCrFeMnNi high-entropy alloy under fully reversed cyclic deformation[J]. J. Mater. Sci. Technol., 2019, 35(3): 334-340.

Figures/Tables 8

Fig. 1. (a, c) Inverse pole figure (IPF) maps and (b, d) distribution of misorientation angle of the HEA specimens with mean grain sizes of (a, b) 30?μm and (c, d) 0.65?μm. fHAGB and fTB are related to the fraction of high-angle grain boundaries (HAGB) and twin boundaries (TBs). (e) SEM and (f) TEM images of the UFG HEA. Some precipitates were indicated by arrows.

Fig. 2. (a) Tensile engineering stress?strain curves and (b) S?N curves of the HEAs with different grain sizes. CG: coarse-grained; UFG: ultrafine-grained.

Table 1 Tensile and fatigue properties of the CoCrFeMnNi HEA with different grain sizes. d: grain size; σ0.2: yield strength; σUTS: ultimate tensile strength; εUE: uniform elongation; σ-1: fatigue strength; σf': fatigue strength coefficient; b: fatigue strength exponent.

d (μm)	σ0.2 (MPa)	σUTS (MPa)	εUE	σ-1 (MPa)	Fatigue ratio σ-1/σUTS	σf' (MPa)	b
30	300	676	0.41	190	0.28	545	-0.058
0.65	800	888	0.27	280	0.32	4393	-0.187

Fig. 3. TEM images of the UFG HEA after fatigue test at a stress amplitude of 300?MPa for 744,162 cycles.

Fig. 4. (a, b) TEM, (c) STEM and (d) EDS images of the UFG HEA after fatigue test at a stress amplitude of 600?MPa for 17,050 cycles. The EDS maps in (d) are from the square region in (c).

Fig. 5. Fractography of the UFG HEA after fatigue test at a stress amplitude of 400?MPa for 234,731 cycles.

Fig. 6. Fractography of the CG HEA after fatigue test at a stress amplitude of 250?MPa for 811,000 cycles.

Fig. 7. Schematic illustration on the fatigue strength enhancement of the HEA.

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