J. Mater. Sci. Technol. ›› 2017, Vol. 33 ›› Issue (9): 1015-1022.DOI: 10.1016/j.jmst.2016.12.003
Special Issue: 2017腐蚀与防护专辑
• Orginal Article • Previous Articles Next Articles
Sun Fangfanga, Liu Nash Guirub, Li Qunyinga, Liu Enzuoac, He Chunnainac, Shi Chunshengac, Zhao Naiqinac*()
Received:
2016-09-06
Revised:
2016-10-31
Accepted:
2016-12-19
Online:
2017-09-20
Published:
2017-10-16
Contact:
Zhao Naiqin
About author:
1 The authors contributed equally to this work.
Sun Fangfang, Liu Nash Guiru, Li Qunying, Liu Enzuo, He Chunnain, Shi Chunsheng, Zhao Naiqin. Effect of Sc and Zr additions on microstructures and corrosion behavior of Al-Cu-Mg-Sc-Zr alloys[J]. J. Mater. Sci. Technol., 2017, 33(9): 1015-1022.
Alloys | Cu | Mg | Zr | Sc | Fe | Si | Sc + Zr | Al |
---|---|---|---|---|---|---|---|---|
Al-Cu-Mg | 3.92 | 2.11 | 0 | 0 | 0.17 | 0.06 | 0 | Bal. |
Al-Cu-Mg-0.1Sc-0.2Zr | 4.12 | 1.89 | 0.23 | 0.09 | 0.16 | 0.07 | 0.32 | Bal. |
Al-Cu-Mg-0.2Sc-0.4Zr | 3.96 | 1.86 | 0.41 | 0.18 | 0.17 | 0.07 | 0.59 | Bal. |
Table 1 Chemical compositions of studied alloys (in wt%), as determined by inductively coupled plasma-optical emission spectrometry (ICP-OES).
Alloys | Cu | Mg | Zr | Sc | Fe | Si | Sc + Zr | Al |
---|---|---|---|---|---|---|---|---|
Al-Cu-Mg | 3.92 | 2.11 | 0 | 0 | 0.17 | 0.06 | 0 | Bal. |
Al-Cu-Mg-0.1Sc-0.2Zr | 4.12 | 1.89 | 0.23 | 0.09 | 0.16 | 0.07 | 0.32 | Bal. |
Al-Cu-Mg-0.2Sc-0.4Zr | 3.96 | 1.86 | 0.41 | 0.18 | 0.17 | 0.07 | 0.59 | Bal. |
Fig. 2. Optical microstructures of the alloy in solid-solution state: (a) Al-Cu-Mg alloy; (b) Al-Cu-Mg-0.1Sc-0.2Zr alloy; (c) Al-Cu-Mg-0.2Sc-0.4Zr alloy.
Fig. 3. SEM-EBSD measurements of alloys peak-aged at 190℃. Orientation maps: (a) Al-Cu-Mg; (b) Al-Cu-Mg-0.1Sc-0.2Zr; (c) Al-Cu-Mg-0.2Sc-0.4Zr; Misorientation angle distribution: (d) Al-Cu-Mg, (e) Al-Cu-Mg-0.1Sc-0.2Zr, (f) Al-Cu-Mg-0.2Sc-0.4Zr.
Fig. 4. TEM images of the studied alloys with different amount of Sc and Zr additions: (a) Al-Cu-Mg alloy; (b) Al-Cu-Mg-0.1Sc-0.2Zr alloy; (c) Al-Cu-Mg-0.2Sc-0.4Zr alloy; (d and e) Al3(Sc, Zr) in Al-Cu-Mg-0.2Sc-0.4Zr alloy; (f) SAD in [001]Al projection; (g) SAD in [011]Al projection.
Element | Al-Cu-Mg | Al-Cu-Mg-0.1Sc-0.2Zr | Al-Cu-Mg-0.2Sc-0.4Zr |
---|---|---|---|
Cu | 21.79 | 11.88 | 10.54 |
Mg | 8.72 | 7.45 | 6.97 |
Cu:Mg | 2.50 | 1.59 | 1.51 |
Table 2 Average EDS test results (three tests) of the grain boundary precipitates in Al-Cu-Mg-Sc-Zr alloys (wt%).
Element | Al-Cu-Mg | Al-Cu-Mg-0.1Sc-0.2Zr | Al-Cu-Mg-0.2Sc-0.4Zr |
---|---|---|---|
Cu | 21.79 | 11.88 | 10.54 |
Mg | 8.72 | 7.45 | 6.97 |
Cu:Mg | 2.50 | 1.59 | 1.51 |
Fig. 5. Metallographic images of cross-section morphology after immersion in the corrosive environment: (a) Al-Cu-Mg; (b) Al-Cu-Mg-0.1Sc-0.2Zr; (c) Al-Cu-Mg-0.2Sc-0.4Zr.
Alloys | σb (MPa) | σf (MPa) | δUTS (%) | δb (%) | δf (%) | δEI (%) |
---|---|---|---|---|---|---|
Al-Cu-Mg | 363.5 (±17) | 320.3 (±21) | 11.88 | 7.36 (±0.1) | 2.64 (±0.2) | 64.13 |
Al-Cu-Mg-0.1Sc-0.2Zr | 436.0 (±14) | 411.5 (±19) | 5.64 | 13.64 (±0.2) | 10.32 (±0.1) | 24.34 |
Al-Cu-Mg-0.2Sc-0.4Zr | 432.5 (±18) | 412.6 (±10) | 4.60 | 14.16 (±0.1) | 12.36 (±0.3) | 12.71 |
Table 3 Variations of the σb and δb with different amount of Sc and Zr addition for the peak-aged Al-Cu-Mg alloys.
Alloys | σb (MPa) | σf (MPa) | δUTS (%) | δb (%) | δf (%) | δEI (%) |
---|---|---|---|---|---|---|
Al-Cu-Mg | 363.5 (±17) | 320.3 (±21) | 11.88 | 7.36 (±0.1) | 2.64 (±0.2) | 64.13 |
Al-Cu-Mg-0.1Sc-0.2Zr | 436.0 (±14) | 411.5 (±19) | 5.64 | 13.64 (±0.2) | 10.32 (±0.1) | 24.34 |
Al-Cu-Mg-0.2Sc-0.4Zr | 432.5 (±18) | 412.6 (±10) | 4.60 | 14.16 (±0.1) | 12.36 (±0.3) | 12.71 |
Fig. 6. Metallographic images of cross-section morphology of the peak-aged alloys show the developed corrosion pits morphology after exposure to IGC environment for different durations: Al-Cu-Mg alloy exposed for (a) 3 h; (c) 6 h; (e) 12 h and (g) 24 h; Al-Cu-Mg-0.2Sc-0.4Zr alloy exposed for (b) 3 h; (d) 6 h; (f) 12 h and (h) 24 h; Schematic drawing of pit shape of (i)Al-Cu-Mg alloy; (j) Al-Cu-Mg-0.2Sc-0.4Zr.
Element | Al-Cu-Mg | Al-Cu-Mg-0.2Sc-0.4Zr | ||
---|---|---|---|---|
3 h | 24 h | 3 h | 24 h | |
Cu | 29.13 | 51.30 | 10.65 | 32.49 |
Mg | 2.86 | 1.68 | 5.14 | 4.95 |
Cu:Mg | 10.16 | 30.54 | 2.07 | 6.56 |
Table 4 Average EDS test results (three tests) at the bottom of inter-granular corrosion of Al-Cu-Mg-Sc-Zr alloys after immersion for different time (wt%).
Element | Al-Cu-Mg | Al-Cu-Mg-0.2Sc-0.4Zr | ||
---|---|---|---|---|
3 h | 24 h | 3 h | 24 h | |
Cu | 29.13 | 51.30 | 10.65 | 32.49 |
Mg | 2.86 | 1.68 | 5.14 | 4.95 |
Cu:Mg | 10.16 | 30.54 | 2.07 | 6.56 |
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