A Novel Series of Refractory High-Entropy Alloys Ti2ZrHf0.5VNbx with High Specific Yield Strength and Good Ductility

doi:10.1007/s40195-019-00921-3

Abstract

Abstract:

A series of Ti₂ZrHf_0.5VNb_x (x=0, 0.25, 0.5, 0.75 and 1.0) refractory high-entropy alloys were prepared to investigate the alloying effect of Nb on the microstructures and mechanical properties. All the alloys displayed a simple BCC structure. The microstructures of the alloys changed from the initial single-phase columnar structure (x=0) to dendrite microstructure (x>0). At room temperature, all the alloys exhibited high ductility (with the compressive strains of more than 50%). With the increase in Nb content, the yield strength slightly decreased from 1160 to 980 MPa and the hardness dropped from 338 to 310 HV. Moreover, the alloys exhibited low density from 6.47 to 6.84 g/cm³ and high specific yield strength (SYS) from 143 to 179 kPa m³/kg. The comprehensive performance of ductility and SYS was superior to most of the reported high-entropy alloys. The yield strength of the alloys increased from 405 to 859 MPa and from 85 to 195 MPa with the addition of Nb element at 873 K and 1073 K, respectively.

Key words: Specific yield strength, Refractory metals Structure, Mechanical properties

Dong-Xu Qiao, Hui Jiang, Wen-Na Jiao, Yi-Ping Lu, Zhi-Qiang Cao, Ting-Ju Li. A Novel Series of Refractory High-Entropy Alloys Ti₂ZrHf_0.5VNb_x with High Specific Yield Strength and Good Ductility[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(8): 925-931.

Figures/Tables 9

Table 1 Parameters of VEC, δ (atomic size difference), ΔHmix (enthalpy of mixing), ΔSmix (configurational entropy), Ω (solid solution formability) and aexp (lattice constant) for Ti2ZrHf0.5VNbx alloys

Alloy	VEC	δ	ΔH_mix (kJ/mol)	ΔS_mix (J/(K mol))	Ω	a_exp (pm)
Nb₀	4.22	6.11	-?1.78	10.58	12.41	335.42
Nb_0.25	4.26	5.95	-?1.2	11.74	20.78	335.83
Nb_0.5	4.3	5.81	-?0.72	12.23	36.61	336.05
Nb_0.75	4.33	5.67	-?0.33	12.48	82.59	336.15
Nb₁	4.37	5.54	0	12.61	∞	336.58

Fig. 2 Microstructures of Ti2ZrHf0.5VNbx RHEAs: ax?=?0; bx?=?0.25; cx?=?0.5; dx?=?0.75; ex?=?1; f bright-filed TEM image of Nb0.5 alloy

Fig. 3 SEM image (a), elemental mapping of Ti (b), Zr (c), Hf (d), V (e), Nb (f) for Nb1 alloy, respectively

Fig. 4 a Compressive engineering stress-strain curves of Ti2ZrHf0.5VNbx alloys, b linear graphs of Vickers hardness and yield strength for Ti2ZrHf0.5VNbx alloys

Table 2 Mechanical properties of Ti2ZrHf0.5VNbx alloys

Alloy	σ (MPa)	ε (%)	Hardness (HV)	ρ (g/cm³)	SYS
Nb₀	1160	>?50	338.3	6.47	179.3
Nb_0.25	1115	>?50	332.4	6.57	169.7
Nb_0.5	1065	>?50	322.5	6.66	159.9
Nb_0.75	1025	>?50	318.9	6.77	151.4
Nb₁	980	>?50	310.4	6.84	143.3

Fig. 5 SYS and ductility of series of Ti2ZrHf0.5VNbx alloys at RT compared with other reported HEAs

Fig. 6 Compressive stress-strain curves of Nb0, Nb0.5 and Nb1 alloys at 873 K (a), 1073 K (b), linear graphs of temperature and strength (c)

Table 3 Values of compressive properties of Ti2ZrHf0.5VNbx alloys at RT, 873 K and 1073 K

Alloy	Temperature (K)	σ (MPa)	T_m (K)
Nb₀	298	1160	2089
	873	405
	1073	85
Nb_0.5	298	1065	2155
	873	718
	1073	135
Nb₁	298	980	2209
	873	859
	1073	195

Table 4 Characters of experimental elements (r atomic radius)

Element	VEC	r (?)	ρ (g/cm³)	T_m (K)
Ti	4	1.42	4.51	1933
Zr	4	1.55	6.51	2125
Hf	4	1.54	13.31	2500
V	5	1.31	5.96	2163
Nb	5	1.43	8.57	2750

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A Novel Series of Refractory High-Entropy Alloys Ti₂ZrHf_0.5VNb_x with High Specific Yield Strength and Good Ductility

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