Effect of Combined Extrusion and Rolling Parameters on Mechanical and Corrosion Properties of New High Strength Al-Mg Alloy
Abstract
:1. Introduction
2. Materials and Methods
3. Results
4. Conclusions
- IGC resistance increases as the grain size decreases for both specimen E and A without sensitization heat treatment. On the other hand, IGC resistance decreases as the grain size increases due to the anodic precipitation formed at the grain boundary continuously during sensitization heat treatment. In cold-rolled states, the mass loss results show the least among the other process in both as-received and sensitization heat treatment.
- Polarization curve tests were conducted on a sheet made of Al-Mg alloy for each process to evaluate the electrochemical properties in a neutral solution. The corrosion potential results are irrespective of the process, while the corrosion current density, which is closely related to the electrochemical corrosion rates, was increased as the sensitization heat treatment was done. It can be said that the grain size affects the corrosion current density results. Small grain size results in increasing the distribution of anodic precipitation. The sensitized cold-rolled specimen shows the highest results due to the non-homogeneous nucleation spot resulting in increasing the volume fraction of anodic precipitation.
- Both hardness and tensile results show that the annealed specimen, which has a small grain size, shows higher than extruded samples. There is no such effect on sensitization heat treatment on tensile results between extruded and annealed state, but hardness results show a little bit increased in both conditions. Instead of the precipitate hardening effect, age softening dominates in the sensitized cold-rolled specimen, resulting in decreasing both hardness and tensile results.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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Specimen | Detailed Manufacturing Process | Sensitization |
---|---|---|
* E | Extrusion (12 mm) | - |
* ES | Extrusion (12 mm) | 200 °C for 45 min |
* CR | Extrusion (12 mm)→Cold Rolling (6 mm)→Annealing (350 °C for 3 h)→Cold Rolling (1 mm) | - |
* CRS | Extrusion (12 mm)→Cold Rolling (6 mm)→Annealing (350 °C for 3 h)→Cold Rolling (1 mm) | 200 °C for 45 min |
* A | Extrusion (12 mm)→Cold Rolling (6 mm)→Annealing (350 °C for 3 h)→Cold Rolling (1 mm)→Annealing (350 °C for 3 h) | - |
* AS | Extrusion (12 mm)→Cold Rolling (6 mm)→Annealing (350 °C for 3 h)→Cold Rolling (1 mm)→Annealing (350 °C for 3 h) | 200 °C for 45 min |
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Choi, K.-H.; Kim, B.-H.; Lee, D.-B.; Yang, S.-Y.; Kim, N.-S.; Ha, S.-H.; Yoon, Y.-O.; Lim, H.-K.; Kim, S.-K. Effect of Combined Extrusion and Rolling Parameters on Mechanical and Corrosion Properties of New High Strength Al-Mg Alloy. Metals 2021, 11, 445. https://0-doi-org.brum.beds.ac.uk/10.3390/met11030445
Choi K-H, Kim B-H, Lee D-B, Yang S-Y, Kim N-S, Ha S-H, Yoon Y-O, Lim H-K, Kim S-K. Effect of Combined Extrusion and Rolling Parameters on Mechanical and Corrosion Properties of New High Strength Al-Mg Alloy. Metals. 2021; 11(3):445. https://0-doi-org.brum.beds.ac.uk/10.3390/met11030445
Chicago/Turabian StyleChoi, Kweon-Hoon, Bong-Hwan Kim, Da-Bin Lee, Seung-Yoon Yang, Nam-Seok Kim, Seong-Ho Ha, Young-Ok Yoon, Hyun-Kyu Lim, and Shae-Kwang Kim. 2021. "Effect of Combined Extrusion and Rolling Parameters on Mechanical and Corrosion Properties of New High Strength Al-Mg Alloy" Metals 11, no. 3: 445. https://0-doi-org.brum.beds.ac.uk/10.3390/met11030445