About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Environmentally Assisted Cracking: Theory and Practice
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Presentation Title |
Preventing the Sensitization in Aluminum Magnesium Alloys |
Author(s) |
Ramasis Goswami |
On-Site Speaker (Planned) |
Ramasis Goswami |
Abstract Scope |
Al 5000 series alloys are widely used for boat and ship structural applications. However, it becomes susceptible to intergranular corrosion and stress corrosion cracking (SCC), as a result of the formation of the grain boundary beta phase, Al3Mg2, which is anodic relative to the Al matrix. The SCC susceptibility occurs as a result of thermal exposure in the range of 50-200C. This leads to a catastrophic structural failure via anodic dissolution of the grain boundary phase upon exposure to seawater. We demonstrate here the beta phase formation in aluminum-magnesium alloys has been suppressed by alloying with small amount of boron. TEM and XRD observations revealed that a boride compound, AlMgB2, forms at grain boundaries and within aluminum matrix, and the beta phase does not nucleate and grow at grain boundaries upon extended annealing. This is a significant finding as it addresses the longstanding problem of sensitization in aluminum-magnesium alloys.
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Proceedings Inclusion? |
Planned: |
Keywords |
Aluminum, Characterization, Environmental Effects |