High-temperature ultra-strength of dual-phase Re0.5MoNbW(TaC)0.5 high-entropy alloy matrix composite

doi:10.1016/j.jmst.2020.12.015

Abstract

Abstract:

The dual-phase Re_0.5MoNbW(TaC)_0.5 composite, consisting of refractory body-centered cubic (BCC) high-entropy alloy and carbide with many fine eutectic structures, was successfully synthesized by arc melting. The phase stability, high-temperature mechanical properties and strengthening mechanism of the as-cast composite were studied. The microstructure of the composite remained stable after annealing at 1300 ℃ for 168h. It exhibited remarkably high-temperature strength, yield strength ~ 901 MPa, and true ultimate compressive strength ~ 1186 MPa at 1200 ℃. The BCC phase and carbide exhibited a semi-coherent interface with good bonding after severe deformation at 1200 ℃. The dipolar dislocation walls in BCC phase, restricted dynamic interaction between defects in carbide, and the pinning effect of semi-coherent interface offered effective strengthening effects.

Key words: High-entropy alloy, Composite, Eutectic structure, Strength, Strengthening mechanism

Qinqin Wei, Guoqiang Luo, Rong Tu, Jian Zhang, Qiang Shen, Yujie Cui, Yunwei Gui, Akihiko Chiba. High-temperature ultra-strength of dual-phase Re_0.5MoNbW(TaC)_0.5 high-entropy alloy matrix composite[J]. J. Mater. Sci. Technol., 2021, 84: 1-9.

Figures/Tables 10

Fig. 1. Microstructure of the as-cast Re0.5MoNbW(TaC)0.5 composite. (a) EBSD phase map and (b) TEM bright-field image. The insets show the selected area electron-beam diffraction patterns of the BCC and FCC-MC phases, respectively. Z. A. refers to zone axis. (c) HRTEM image of BCC/FCC-MC phase interface.

Fig. 2. (a) XRD patterns and (b-d) BSE images of the Re0.5MoNbW(TaC)0.5 composite: (b) as-cast, (c) annealed at 1300 ℃ for 72 h, (d) annealed at 1300 ℃ for 168 h.

Table 1 Chemical compositions of the phases in the Re0.5MoNbW(TaC)0.5 composite obtained from SEM-EDS.

	Phase	Mo	Nb	Re	W	Ta	C
As-cast	BCC	23.4 ± 0.7	16.7 ± 1.4	13.4 ± 1.3	33.8 ± 0.3	12.7 ± 0.5	0
As-cast	FCC-MC	7.2 ± 0.1	38.4 ± 1.2	0	3.8 ± 0.5	16.0 ± 0.8	34.6 ± 1.8
Annealed for 72 h	BCC	25.1 ± 0.8	17.4 ± 0.8	13.6 ± 0.6	32.7 ± 0.6	11.2 ± 1.2	0
Annealed for 72 h	FCC-MC	6.9 ± 0.4	39.5 ± 0.5	0	3.9 ± 0.4	15.4 ± 0.7	34.3 ± 1.5
Annealed for 168 h	BCC	25.6 ± 0.9	16.8 ± 0.7	14.7 ± 0.4	31.3 ± 0.5	11.7 ± 1.0	0
Annealed for 168 h	FCC-MC	7.1 ± 0.4	37.3 ± 1.0	0	3.8 ± 0.7	16.7 ± 0.7	35.1 ± 2.2

Fig. 3. (a) Calculated equilibrium phase composition and (b) DSC-TG curves of the as-cast Re0.5MoNbW(TaC)0.5 composite.

Fig. 4. Compressive (a) engineering and (b) true stress-strain curves of the as-cast Re0.5MoNbW(TaC)0.5 composite. The inset in (b) shows the corresponding work hardening curves. Temperature dependence of engineering (c) yield strength and (d) ultimate compressive strength obtained here, relative to some other high-temperature materials [9,24,25].

Fig. 5. Microstructure of the composite after compression at 1200 ℃. (a) HAADF-STEM micrograph and (b) TEM bright-field micrograph. (c-h) The corresponding EDX maps of image (a).

Fig. 6. TEM micrographs of the phase interface after compression at 1200 ℃. (a) HRTEM image and (b) a Fourier-filtered image of the phase interface. (c) The enlarged image of the white outlined region in (b) showing screw dislocations in BCC near the interface. (d) FFT patterns of the image (a) showing the relationship between BCC HEA and FCC-MC carbide.

Fig. 7. TEM bright-field micrographs of the deformed BCC HEA after compression at 1200 ℃. (a) Dislocation dipolar walls in BCC and pile-ups in the phase interface. (b) The enlarged micrograph in (a) showing dislocation dipoles and dislocation pinning.

Fig. 8. TEM micrographs of deformed FCC-MC carbide after compression at 1200 ℃. (a) TEM bright-field micrograph and (b) the corresponding enlarged image showing stacking faults and coplanar dislocation arrays. (c) TEM and (d) the corresponding HRTEM micrographs showing deformation twins. (e) A Fourier-filtered image near the large twin boundary in (d). (f) FFT pattern showing the twin relationship in (d).

Fig. 9. Microstructural evolution schematic of the Re0.5MoNbW(TaC)0.5 composite.

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