Mechanical Properties and Phase Stability of WTaMoNbTi Refractory High-Entropy Alloy at Elevated Temperatures

doi:10.1007/s40195-021-01263-9

Abstract

Abstract:

High-temperature structural metals remain in high demand for aerospace aircraft, gas turbine engines, and nuclear power plants. Refractory high-entropy alloys (RHEAs) with superior mechanical properties at elevated temperatures are promising candidates for high-temperature structural materials. In this work, a WTaMoNbTi RHEA with adequate room temperature plasticity and considerable strength at 1600 °C was fabricated by vacuum arc-melting. The room temperature fracture strain of the as-cast WTaMoNbTi RHEA was 7.8%, which was about 5.2 times that of the NbMoTaW alloy. The alloy exhibited a strong resistance to high-temperature softening, with a high yield strength of 173 MPa and compressive strength of 218 MPa at 1600 °C. The WTaMoNbTi RHEA possessed excellent phase stability in the range of room temperature to 2000 °C. The dendritic grains grew into equiaxed grains after compression test at 1600 °C due to the dynamic recrystallization process at high temperature. This work presents a promising high-temperature structural material that can be applied at 1600 °C.

Key words: Refractory high entropy alloy, Mechanical property, Phase stability, Elevated temperature properties, Metals and alloys

Yixing Wan, Jinyong Mo, Xin Wang, Zhibin Zhang, Baolong Shen, Xiubing Liang. Mechanical Properties and Phase Stability of WTaMoNbTi Refractory High-Entropy Alloy at Elevated Temperatures[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(11): 1585-1590.

Figures/Tables 8

Fig. 1 a XRD pattern and b compressive engineering stress-strain curve of the as-cast WTaMoNbTi RHEA at room temperature

Table 1 Compression properties of the WTaMoNbTi RHEA

Temperature (°C)	Yield strength, σ_0.2 (MPa)	Compressive strength, σ_m (MPa)	Fracture strain, ε (%)	Final strain (%)
25	1457	1681	7.8	-
1600	173	218	-	> 25

Fig. 2 a BSE image and b-f EDS mappings of the as-cast WTaMoNbTi RHEA at room temperature

Fig. 3 a Compression engineering stress-strain curve of the WTaMoNbTi RHEA obtained at 1600 °C; b temperature dependence of the yield stress of WTaMoNbTi and similar RHEAs

Fig. 4 a XRD patterns of the annealed WTaMoNbTi RHEA ingots; b BSE image of the WTaMoNbTi RHEA ingot after annealing at 2000 °C

Fig. 5 BSE image of the cross section of the WTaMoNbTi RHEA rod sample after compressing at 1600 °C

Table 2 ΔSmix, ΔHmix, δ, VEC and Ω of the WTaMoNbTi RHEA

ΔS_mix (J/(K·mol))	ΔH_mix (kJ/mol)	δ (%)	VEC	Ω
13.38	- 5.28	1.36	4.2	7.39

Table 3 Melting temperatures (in degrees K) of the WTaMoNbTi RHEA and corresponding metals

W	Ta	Mo	Nb	Ti	WTaMoNbTi Est
3695 [33]	3290 [33]	2896 [33]	2750 [34]	1941 [34]	2914

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