Microstructure and Corrosion Characterization of Squeeze Cast AM50 Magnesium Alloys
| Autor: | Deepika Sachdeva, Shashank Tiwari, Suresh Sundarraj, Alan A. Luo |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
business.product_category Structural material Magnesium Metallurgy Alloy Metals and Alloys chemistry.chemical_element engineering.material Condensed Matter Physics Microstructure Corrosion chemistry Mechanics of Materials Aluminium Materials Chemistry engineering Die (manufacturing) Foundry business |
| Zdroj: | Metallurgical and Materials Transactions B. 41:1375-1383 |
| ISSN: | 1543-1916 1073-5615 |
| DOI: | 10.1007/s11663-010-9433-x |
| Popis: | Squeeze casting of magnesium alloys potentially can be used in lightweight chassis components such as control arms and knuckles. This study documents the microstructural analysis and corrosion behavior of AM50 alloys squeeze cast at different pressures between 40 and 120 MPa and compares them with high-pressure die cast (HPDC) AM50 alloy castings and an AM50 squeeze cast prototype control arm. Although the corrosion rates of the squeeze cast samples are slightly higher than those observed for the HPDC AM50 alloy, the former does produce virtually porosity-free castings that are required for structural applications like control arms and wheels. This outcome is extremely encouraging as it provides an opportunity for additional alloy and process development by squeeze casting that has remained relatively unexplored for magnesium alloys compared with aluminum. Among the microstructural parameters analyzed, it seems that the β-phase interfacial area, indicating a greater degree of β network, leads to a lower corrosion rate. Weight loss was the better method for determining corrosion behavior in these alloys that contain a large fraction of second phase, which can cause perturbations to an overall uniform surface corrosion behavior. |
| Databáze: | OpenAIRE |
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