J. Mater. Sci. Technol. ›› 2019, Vol. 35 ›› Issue (11): 2600-2607.DOI: 10.1016/j.jmst.2019.07.013
• Orginal Article • Previous Articles Next Articles
Liu Qing, Wang Guofeng*(), Sui Xiaochong, Liu Yongkang, Li Xiao, Yang Jianlei
Received:
2019-04-08
Revised:
2019-05-31
Accepted:
2019-06-30
Online:
2019-11-05
Published:
2019-10-21
Contact:
Wang Guofeng
About author:
1The authors equally contributed to this work.
Liu Qing, Wang Guofeng, Sui Xiaochong, Liu Yongkang, Li Xiao, Yang Jianlei. Microstructure and mechanical properties of ultra-fine grained MoNbTaTiV refractory high-entropy alloy fabricated by spark plasma sintering[J]. J. Mater. Sci. Technol., 2019, 35(11): 2600-2607.
Property | Mo | Nb | Ta | Ti | V |
---|---|---|---|---|---|
Purity (%) | 99.9 | 99.9 | 99.9 | 99.5 | 99.9 |
Powder size (μm) | <2 | <48 | <48 | <74 | <48 |
Table 1 Characteristics of the original elemental powders.
Property | Mo | Nb | Ta | Ti | V |
---|---|---|---|---|---|
Purity (%) | 99.9 | 99.9 | 99.9 | 99.5 | 99.9 |
Powder size (μm) | <2 | <48 | <48 | <74 | <48 |
Alloying time (h) | Mo | Nb | Ta | Ti | V |
---|---|---|---|---|---|
0 | 20a | 20a | 20a | 20a | 20a |
40 | 19.08 | 22.19 | 20.11 | 19.76 | 18.86 |
Table 2 EDS results of the mechanically alloyed powders at 40 h (at.%).
Alloying time (h) | Mo | Nb | Ta | Ti | V |
---|---|---|---|---|---|
0 | 20a | 20a | 20a | 20a | 20a |
40 | 19.08 | 22.19 | 20.11 | 19.76 | 18.86 |
Fig. 4. TEM bright field images of the MoNbTaTiV RHEAs sintered temperatures of (a) 1500 °C, (b) 1600 °C, (c) 1700 °C, (d) SAED pattern of the matrix phase and (e) SAED pattern of the precipitation phase.
Sintering temperature (°C) | Average grain size (μm) | Volume fraction (%) | Element content (at.%) | |||
---|---|---|---|---|---|---|
matrix | precipitation | matrix | precipitation | O | N | |
1500 | 0.42 | 0.15 | 95.06 | 4.94 | 2.93 | 1.42 |
1600 | 0.58 | 0.18 | 95.67 | 4.33 | 3.04 | 1.42 |
1700 | 1.33 | 0.28 | 96.12 | 3.88 | 3.15 | 1.54 |
Table 3 Average sizes and volume fractions of the matrix and precipitation phases, and the contents of O and N in the bulk MoNbTaTiV HEAs sintered at different temperatures.
Sintering temperature (°C) | Average grain size (μm) | Volume fraction (%) | Element content (at.%) | |||
---|---|---|---|---|---|---|
matrix | precipitation | matrix | precipitation | O | N | |
1500 | 0.42 | 0.15 | 95.06 | 4.94 | 2.93 | 1.42 |
1600 | 0.58 | 0.18 | 95.67 | 4.33 | 3.04 | 1.42 |
1700 | 1.33 | 0.28 | 96.12 | 3.88 | 3.15 | 1.54 |
Sintering temperature (°C) | σy (MPa) | σmax (MPa) | ε (%) | ρ (g cm-3) |
---|---|---|---|---|
1500 | 1877 | 2812 | 21.1 | 9.22 |
1600 | 2208 | 3238 | 24.9 | 9.45 |
1700 | 2179 | 3125 | 23.6 | 9.46 |
Table 4 Yield strengths (σy), fracture strengths (σmax), plastic strains (ε) and densities (ρ) of the MoNbTaTiV RHEAs at room temperature.
Sintering temperature (°C) | σy (MPa) | σmax (MPa) | ε (%) | ρ (g cm-3) |
---|---|---|---|---|
1500 | 1877 | 2812 | 21.1 | 9.22 |
1600 | 2208 | 3238 | 24.9 | 9.45 |
1700 | 2179 | 3125 | 23.6 | 9.46 |
Fig. 8. Compressive fracture morphologies of the MoNbTaTiV RHEAs at room temperatures after sintered at (a) 1500 °C, (b) 1600 °C, (c) 1700 °C and (d-f) corresponding magnified images of (a-c).
Alloy | Process | σy (MPa) | σmax (MPa) | ε (%) | Refs. |
---|---|---|---|---|---|
MoNbTaTiV | MA + SPS | 2208 | 3238 | 24.9 | This work |
MoNbTaTiV | Arc-melting | 1400 | 2450 | 30 | [ |
MoNbTaVW | MA + SPS | 2612 | 3472 | 8.8 | [ |
MoNbTaVW | Arc-melting | 1246 | 1270 | 1.7 | [ |
MoNbTaW | Arc-melting | 1058 | 1211 | 2.1 | [ |
NbTaTiVW | Arc-melting | 1420 | ≈1800 | 20 | [ |
NbTaVW | Arc-melting | 1530 | ≈1700 | 12 | [ |
MoNbTaV | Arc-melting | 1525 | 2400 | 21 | [ |
HfMoTaTiZr | Arc-melting | 1600 | 1743 | 4 | [ |
HfMoNbTaTiZr | Arc-melting | 1512 | 1828 | 12 | [ |
HfMoNbTiZr | Arc-melting | 1719 | 1803 | 10.1 | [ |
AlNbTiV | Arc-melting | 1020 | 1318 | 5 | [ |
CrMo0.5NbTa0.5TiZr | Arc-melting | 1595 | 2046 | 5 | [ |
Table 5 Mechanical properties of the MoNbTaTiV RHEA sintered at 1600 °C and some typical RHEAs at room temperature.
Alloy | Process | σy (MPa) | σmax (MPa) | ε (%) | Refs. |
---|---|---|---|---|---|
MoNbTaTiV | MA + SPS | 2208 | 3238 | 24.9 | This work |
MoNbTaTiV | Arc-melting | 1400 | 2450 | 30 | [ |
MoNbTaVW | MA + SPS | 2612 | 3472 | 8.8 | [ |
MoNbTaVW | Arc-melting | 1246 | 1270 | 1.7 | [ |
MoNbTaW | Arc-melting | 1058 | 1211 | 2.1 | [ |
NbTaTiVW | Arc-melting | 1420 | ≈1800 | 20 | [ |
NbTaVW | Arc-melting | 1530 | ≈1700 | 12 | [ |
MoNbTaV | Arc-melting | 1525 | 2400 | 21 | [ |
HfMoTaTiZr | Arc-melting | 1600 | 1743 | 4 | [ |
HfMoNbTaTiZr | Arc-melting | 1512 | 1828 | 12 | [ |
HfMoNbTiZr | Arc-melting | 1719 | 1803 | 10.1 | [ |
AlNbTiV | Arc-melting | 1020 | 1318 | 5 | [ |
CrMo0.5NbTa0.5TiZr | Arc-melting | 1595 | 2046 | 5 | [ |
Sintering temperature (°C) | O and N contents in matrix (at.%) | Δσor (MPa) | Δσiss (MPa) | Δσgr (MPa) | σ0 + Δσss (MPa) |
---|---|---|---|---|---|
1500 | 0.28 | 119 | — | — | 1376 |
1600 | 0.97 | 91 | 426 | 315 | 1376 |
1700 | 1.58 | 51 | 543 | 209 | 1376 |
Table 6 O and N contents in matrix and calculated contributions of the strengthening mechanisms: Orowan strengthening (Δσor), interstitial solid solution strengthening (Δσiss), grain boundary strengthening (Δσgr), intrinsic strength and substitution solid solution strengthening (σ0 + Δσss).
Sintering temperature (°C) | O and N contents in matrix (at.%) | Δσor (MPa) | Δσiss (MPa) | Δσgr (MPa) | σ0 + Δσss (MPa) |
---|---|---|---|---|---|
1500 | 0.28 | 119 | — | — | 1376 |
1600 | 0.97 | 91 | 426 | 315 | 1376 |
1700 | 1.58 | 51 | 543 | 209 | 1376 |
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