Acta Metallurgica Sinica (English Letters) ›› 2019, Vol. 32 ›› Issue (8): 925-931.DOI: 10.1007/s40195-019-00921-3
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Dong-Xu Qiao1, Hui Jiang2, Wen-Na Jiao1, Yi-Ping Lu1(), Zhi-Qiang Cao1, Ting-Ju Li1
Received:
2019-03-28
Revised:
2019-04-24
Online:
2019-08-10
Published:
2019-07-08
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 Ti2ZrHf0.5VNbx with High Specific Yield Strength and Good Ductility[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(8): 925-931.
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Alloy | VEC | δ | ΔHmix (kJ/mol) | ΔSmix (J/(K mol)) | Ω | aexp (pm) |
---|---|---|---|---|---|---|
Nb0 | 4.22 | 6.11 | -?1.78 | 10.58 | 12.41 | 335.42 |
Nb0.25 | 4.26 | 5.95 | -?1.2 | 11.74 | 20.78 | 335.83 |
Nb0.5 | 4.3 | 5.81 | -?0.72 | 12.23 | 36.61 | 336.05 |
Nb0.75 | 4.33 | 5.67 | -?0.33 | 12.48 | 82.59 | 336.15 |
Nb1 | 4.37 | 5.54 | 0 | 12.61 | ∞ | 336.58 |
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 | ΔHmix (kJ/mol) | ΔSmix (J/(K mol)) | Ω | aexp (pm) |
---|---|---|---|---|---|---|
Nb0 | 4.22 | 6.11 | -?1.78 | 10.58 | 12.41 | 335.42 |
Nb0.25 | 4.26 | 5.95 | -?1.2 | 11.74 | 20.78 | 335.83 |
Nb0.5 | 4.3 | 5.81 | -?0.72 | 12.23 | 36.61 | 336.05 |
Nb0.75 | 4.33 | 5.67 | -?0.33 | 12.48 | 82.59 | 336.15 |
Nb1 | 4.37 | 5.54 | 0 | 12.61 | ∞ | 336.58 |
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
Alloy | σ (MPa) | ε (%) | Hardness (HV) | ρ (g/cm3) | SYS |
---|---|---|---|---|---|
Nb0 | 1160 | >?50 | 338.3 | 6.47 | 179.3 |
Nb0.25 | 1115 | >?50 | 332.4 | 6.57 | 169.7 |
Nb0.5 | 1065 | >?50 | 322.5 | 6.66 | 159.9 |
Nb0.75 | 1025 | >?50 | 318.9 | 6.77 | 151.4 |
Nb1 | 980 | >?50 | 310.4 | 6.84 | 143.3 |
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 |
Nb0.25 | 1115 | >?50 | 332.4 | 6.57 | 169.7 |
Nb0.5 | 1065 | >?50 | 322.5 | 6.66 | 159.9 |
Nb0.75 | 1025 | >?50 | 318.9 | 6.77 | 151.4 |
Nb1 | 980 | >?50 | 310.4 | 6.84 | 143.3 |
Alloy | Temperature (K) | σ (MPa) | Tm (K) |
---|---|---|---|
Nb0 | 298 | 1160 | 2089 |
873 | 405 | ||
1073 | 85 | ||
Nb0.5 | 298 | 1065 | 2155 |
873 | 718 | ||
1073 | 135 | ||
Nb1 | 298 | 980 | 2209 |
873 | 859 | ||
1073 | 195 |
Table 3 Values of compressive properties of Ti2ZrHf0.5VNbx alloys at RT, 873 K and 1073 K
Alloy | Temperature (K) | σ (MPa) | Tm (K) |
---|---|---|---|
Nb0 | 298 | 1160 | 2089 |
873 | 405 | ||
1073 | 85 | ||
Nb0.5 | 298 | 1065 | 2155 |
873 | 718 | ||
1073 | 135 | ||
Nb1 | 298 | 980 | 2209 |
873 | 859 | ||
1073 | 195 |
Element | VEC | r (?) | ρ (g/cm3) | Tm (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 |
Table 4 Characters of experimental elements (r atomic radius)
Element | VEC | r (?) | ρ (g/cm3) | Tm (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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