Abstract
The microstructure, and electrochemical properties of additively manufactured Al-alloy AA2024 (AM2024, Al-Cu-Mg) produced by selective laser melting are reported. In-depth microstructural characterisation was conducted to compare the resultant microstructure, including phase identification, size and distribution, against the wrought counterpart AA2024-T3. The prospect of producing net shape Al-alloys via additive manufacturing (AM) has the potential to provide cost effective and high specific strength components. It was revealed that the dominant second phase formed in AM2024 was Al 2 Cu (θ–phase), in contrast to the typical Al 2 CuMg (S-phase) observed in AA2024-T3. The AM2024 also revealed a refined microstructure, with an average constituent particle size < 1 μm. Thermodynamic calculations revealed that the preferential formation of θ-phase was influenced by the Si content of AM2024 (0.78 wt. %). Atomic emission spectroelectrochemistry (AESEC) measurements revealed a lower Al dissolution rate (5 times) in the case of AM2024. Anodic polarisation revealed that AM2024 was capable of forming an appreciable surface oxide relative to AA2024-T3. The findings herein demonstrate the possibilities of AM as applied to a high strength Al-alloy.
| Original language | English |
|---|---|
| Pages (from-to) | 93-106 |
| Number of pages | 14 |
| Journal | Corrosion Science |
| Volume | 143 |
| DOIs | |
| Publication status | Published - 1 Oct 2018 |
Keywords
- AA2024
- Additive manufacturing
- Aluminium alloys
- Corrosion
- Selective laser melting
Cite this
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On the corrosion of additively manufactured aluminium alloy AA2024 prepared by selective laser melting. / Gharbi, O.; Jiang, D.; Feenstra, D. R.; Kairy, S. K.; Wu, Y.; Hutchinson, C. R.; Birbilis, N.
In: Corrosion Science, Vol. 143, 01.10.2018, p. 93-106.Research output: Contribution to journal › Article › Research › peer-review
TY - JOUR
T1 - On the corrosion of additively manufactured aluminium alloy AA2024 prepared by selective laser melting
AU - Gharbi, O.
AU - Jiang, D.
AU - Feenstra, D. R.
AU - Kairy, S. K.
AU - Wu, Y.
AU - Hutchinson, C. R.
AU - Birbilis, N.
PY - 2018/10/1
Y1 - 2018/10/1
N2 - The microstructure, and electrochemical properties of additively manufactured Al-alloy AA2024 (AM2024, Al-Cu-Mg) produced by selective laser melting are reported. In-depth microstructural characterisation was conducted to compare the resultant microstructure, including phase identification, size and distribution, against the wrought counterpart AA2024-T3. The prospect of producing net shape Al-alloys via additive manufacturing (AM) has the potential to provide cost effective and high specific strength components. It was revealed that the dominant second phase formed in AM2024 was Al 2 Cu (θ–phase), in contrast to the typical Al 2 CuMg (S-phase) observed in AA2024-T3. The AM2024 also revealed a refined microstructure, with an average constituent particle size < 1 μm. Thermodynamic calculations revealed that the preferential formation of θ-phase was influenced by the Si content of AM2024 (0.78 wt. %). Atomic emission spectroelectrochemistry (AESEC) measurements revealed a lower Al dissolution rate (5 times) in the case of AM2024. Anodic polarisation revealed that AM2024 was capable of forming an appreciable surface oxide relative to AA2024-T3. The findings herein demonstrate the possibilities of AM as applied to a high strength Al-alloy.
AB - The microstructure, and electrochemical properties of additively manufactured Al-alloy AA2024 (AM2024, Al-Cu-Mg) produced by selective laser melting are reported. In-depth microstructural characterisation was conducted to compare the resultant microstructure, including phase identification, size and distribution, against the wrought counterpart AA2024-T3. The prospect of producing net shape Al-alloys via additive manufacturing (AM) has the potential to provide cost effective and high specific strength components. It was revealed that the dominant second phase formed in AM2024 was Al 2 Cu (θ–phase), in contrast to the typical Al 2 CuMg (S-phase) observed in AA2024-T3. The AM2024 also revealed a refined microstructure, with an average constituent particle size < 1 μm. Thermodynamic calculations revealed that the preferential formation of θ-phase was influenced by the Si content of AM2024 (0.78 wt. %). Atomic emission spectroelectrochemistry (AESEC) measurements revealed a lower Al dissolution rate (5 times) in the case of AM2024. Anodic polarisation revealed that AM2024 was capable of forming an appreciable surface oxide relative to AA2024-T3. The findings herein demonstrate the possibilities of AM as applied to a high strength Al-alloy.
KW - AA2024
KW - Additive manufacturing
KW - Aluminium alloys
KW - Corrosion
KW - Selective laser melting
UR - http://www.scopus.com/inward/record.url?scp=85051627328&partnerID=8YFLogxK
U2 - 10.1016/j.corsci.2018.08.019
DO - 10.1016/j.corsci.2018.08.019
M3 - Article
VL - 143
SP - 93
EP - 106
JO - Corrosion Science
JF - Corrosion Science
SN - 0010-938X
ER -