J. Mater. Sci. Technol. ›› 2020, Vol. 36: 1-6.DOI: 10.1016/j.jmst.2019.08.006
• Research Article • Next Articles
A.V. Pozdniakov, R.Yu. Barkov*()
Received:
2019-02-11
Revised:
2019-05-10
Accepted:
2019-06-03
Published:
2020-01-01
Online:
2020-02-11
Contact:
Barkov R.Yu.
A.V. Pozdniakov, R.Yu. Barkov. Microstructure and mechanical properties of novel Al-Y-Sc alloys with high thermal stability and electrical conductivity[J]. J. Mater. Sci. Technol., 2020, 36: 1-6.
Fig. 2. Microstructures of the AlYSc005 (a, c) and AlYSc02 (b, d) alloys in (a, b) as-cast state and (c, d) as-quenched state and distribution of alloying elements between phases, represented by white rectangular boxes in (a) and (b).
Fig. 5. TEM images of the AlYSc02 alloy after annealing the as-cast ingots at 400 °C for 1 h (a-c) and 5 h (d-f): (a, d) bright-field images; (b, e) dark-field images; (с, f) SAED patterns [111].
Fig. 6. TEM images of the AlYSc02 alloy after annealing the homogenized ingots at 400 °C for 1 h (a-c) and 5 h (d-f): (a, d) bright-field images; (b, e) dark-field images; (с, f) SAED patterns [110].
Fig. 7. Hardness curves of the annealed AlYSc005 after rolling (a) and AlYSc02 (b) alloys: (a, b) temperature dependencies after annealing for 1 h; (c) time dependencies (the insets show the microstructures of the annealed samples after, acquired by LM under polarized light after anodizing).
Condition | AlYSc005 | AlYSc02 | ||||
---|---|---|---|---|---|---|
YS (MPa) | UTS (MPa) | Elongation (%) | YS (MPа) | UTS (MPа) | Elongation (%) | |
As-deformed | 146 ± 1 | 156 ± 2 | 10.2 ± 0.4 | 186 ± 2 | 201 ± 1 | 11.8 ± 0.2 |
Annealed at 200 °C for 1 h | 136 ± 2 | 148 ± 3 | 10.4 ± 0.3 | 178 ± 1 | 198 ± 1 | 10.7 ± 0.8 |
Annealed at 200 °C for 5 h | 132 ± 2 | 144 ± 2 | 12.6 ± 0.2 | 174 ± 1 | 194 ± 1 | 12.2 ± 0.4 |
Annealed at 200 °C for 7 h | 133 ± 2 | 145 ± 1 | 12.2 ± 0.8 | 178 ± 1 | 200 ± 1 | 15.1 ± 0.8 |
Annealed at 300 °C for 1 h | 128 ± 3 | 137 ± 3 | 12.3 ± 0.7 | 179 ± 2 | 200 ± 2 | 16.5 ± 0.5 |
Annealed at 300 °C for 5 h | 129 ± 4 | 140 ± 3 | 17.1 ± 0.8 | 177 ± 2 | 199 ± 3 | 15.2 ± 0.4 |
Annealed at 300 °C for 7 h | 127 ± 4 | 138 ± 5 | 16.2 ± 0.2 | 183 ± 3 | 202 ± 2 | 15.8 ± 0.3 |
Table 1 Tensile tests results for the studied alloys (UTS: ultimate tensile strength).
Condition | AlYSc005 | AlYSc02 | ||||
---|---|---|---|---|---|---|
YS (MPa) | UTS (MPa) | Elongation (%) | YS (MPа) | UTS (MPа) | Elongation (%) | |
As-deformed | 146 ± 1 | 156 ± 2 | 10.2 ± 0.4 | 186 ± 2 | 201 ± 1 | 11.8 ± 0.2 |
Annealed at 200 °C for 1 h | 136 ± 2 | 148 ± 3 | 10.4 ± 0.3 | 178 ± 1 | 198 ± 1 | 10.7 ± 0.8 |
Annealed at 200 °C for 5 h | 132 ± 2 | 144 ± 2 | 12.6 ± 0.2 | 174 ± 1 | 194 ± 1 | 12.2 ± 0.4 |
Annealed at 200 °C for 7 h | 133 ± 2 | 145 ± 1 | 12.2 ± 0.8 | 178 ± 1 | 200 ± 1 | 15.1 ± 0.8 |
Annealed at 300 °C for 1 h | 128 ± 3 | 137 ± 3 | 12.3 ± 0.7 | 179 ± 2 | 200 ± 2 | 16.5 ± 0.5 |
Annealed at 300 °C for 5 h | 129 ± 4 | 140 ± 3 | 17.1 ± 0.8 | 177 ± 2 | 199 ± 3 | 15.2 ± 0.4 |
Annealed at 300 °C for 7 h | 127 ± 4 | 138 ± 5 | 16.2 ± 0.2 | 183 ± 3 | 202 ± 2 | 15.8 ± 0.3 |
Condition | IACS (%) | |||
---|---|---|---|---|
AlYSc005 | AlYSc02 | Al (99.99%) [ | 1350 alloy [ | |
As deformed | 59.9 | 59.3 | 64.5 | 61 |
Annealed at 200 °C for 1 h | 60.8 | 60.2 | ||
Annealed at 200 °C for 5 h | 60.8 | 60.2 | ||
Annealed at 200 °C for 7 h | 60.8 | 60.5 | ||
Annealed at 300 °C for 1 h | 60.9 | 60.8 | ||
Annealed at 300 °C for 5 h | 61.7 | 61.5 | ||
Annealed at 300 °C for 7 h | 62.4 | 61.5 |
Table 2 Electrical conductivity of the studied alloys vs. pure Al and 1350 alloy.
Condition | IACS (%) | |||
---|---|---|---|---|
AlYSc005 | AlYSc02 | Al (99.99%) [ | 1350 alloy [ | |
As deformed | 59.9 | 59.3 | 64.5 | 61 |
Annealed at 200 °C for 1 h | 60.8 | 60.2 | ||
Annealed at 200 °C for 5 h | 60.8 | 60.2 | ||
Annealed at 200 °C for 7 h | 60.8 | 60.5 | ||
Annealed at 300 °C for 1 h | 60.9 | 60.8 | ||
Annealed at 300 °C for 5 h | 61.7 | 61.5 | ||
Annealed at 300 °C for 7 h | 62.4 | 61.5 |
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