Acta Metallurgica Sinica (English Letters) ›› 2014, Vol. 27 ›› Issue (4): 642-648.DOI: 10.1007/s40195-014-0086-7
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Pengchao Song, Xifeng Li(), Wei Ding, Jun Chen
Received:
2013-09-25
Revised:
2013-12-08
Online:
2014-08-25
Published:
2014-10-16
Pengchao Song, Xifeng Li, Wei Ding, Jun Chen. Electroplastic Tensile Behavior of 5A90 Al–Li Alloys[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(4): 642-648.
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Tensile conditions | Current density (A/mm2) | Temperature (°C) | Elongation (%) | Yield stress σs (MPa) | Ultimate tensile stress σb (MPa) |
---|---|---|---|---|---|
Room temperature | 0 | 15 | 24.1 | 145 | 385 |
EP tension | 2.17 | – | 25.9 | 144 | 378 |
3.47 | – | 26.1 | 142 | 374 | |
4.76 | – | 29.2 | 119 | 347 | |
9.44 | 110 | 36.1 | 114 | 294 | |
12.47 | 210 | 38.6 | 110 | 220 | |
14.72 | 290 | 60.1 | 52 | 158 | |
16.11 | 320 | 51.9 | 48 | 136 | |
Thermal tension | – | 110 | 32.2 | 201 | 318 |
– | 210 | 34.9 | 196 | 229 | |
– | 290 | 54.4 | 123 | 127 |
Table 1 Tensile properties of 5A90 Al–Li alloy samples at different conditions
Tensile conditions | Current density (A/mm2) | Temperature (°C) | Elongation (%) | Yield stress σs (MPa) | Ultimate tensile stress σb (MPa) |
---|---|---|---|---|---|
Room temperature | 0 | 15 | 24.1 | 145 | 385 |
EP tension | 2.17 | – | 25.9 | 144 | 378 |
3.47 | – | 26.1 | 142 | 374 | |
4.76 | – | 29.2 | 119 | 347 | |
9.44 | 110 | 36.1 | 114 | 294 | |
12.47 | 210 | 38.6 | 110 | 220 | |
14.72 | 290 | 60.1 | 52 | 158 | |
16.11 | 320 | 51.9 | 48 | 136 | |
Thermal tension | – | 110 | 32.2 | 201 | 318 |
– | 210 | 34.9 | 196 | 229 | |
– | 290 | 54.4 | 123 | 127 |
Strain | Temperature (°C) | Flow stress | k1 (%) | ||
---|---|---|---|---|---|
σ1 (MPa) | σ2 (MPa) | σ (MPa) | |||
0.192 | 110 | 274.0 | 310.3 | 374.1 | 63.8 |
0.211 | 210 | 215.8 | 239.4 | 383.2 | 79.9 |
0.236 | 290 | 53.4 | 91.5 | 383.7 | 88.5 |
Table 2 The contribution to the flow stress drop resulted from Joule heating during EP tests
Strain | Temperature (°C) | Flow stress | k1 (%) | ||
---|---|---|---|---|---|
σ1 (MPa) | σ2 (MPa) | σ (MPa) | |||
0.192 | 110 | 274.0 | 310.3 | 374.1 | 63.8 |
0.211 | 210 | 215.8 | 239.4 | 383.2 | 79.9 |
0.236 | 290 | 53.4 | 91.5 | 383.7 | 88.5 |
EP tests | Isothermal tests | Room-temperature tests | k2 (%) | ||
---|---|---|---|---|---|
Current density | Elongation (%) | Temperature (°C) | Elongation (%) | Elongation (%) | |
9.44 | 36.1 | 110 | 32.2 | 24.1 | 67.5 |
12.47 | 38.6 | 210 | 34.9 | 74.4 | |
14.72 | 60.1 | 290 | 54.4 | 84.1 |
Table 3 The contribution to the elongation increase resulted from Joule heating during EP tests
EP tests | Isothermal tests | Room-temperature tests | k2 (%) | ||
---|---|---|---|---|---|
Current density | Elongation (%) | Temperature (°C) | Elongation (%) | Elongation (%) | |
9.44 | 36.1 | 110 | 32.2 | 24.1 | 67.5 |
12.47 | 38.6 | 210 | 34.9 | 74.4 | |
14.72 | 60.1 | 290 | 54.4 | 84.1 |
Fig. 3 SEM fracture surfaces observed in the samples tested at different conditions: a at room temperature, b tested at 9.44 A/mm2, c tested at 14.72 A/mm2, d tested at 290 °C
Fig. 4 TEM bright-field and dark-field micrographs observed in the samples tested at different conditions: a, b at room temperature, c, d tested at 290 °C, e, f tested at 14.72 A/mm2
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