About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Aluminum Alloys, Processing and Characterization
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Presentation Title |
Solubility Limit of Iron in Aluminum and Its Alloys: Role on Recrystallization, Grain Growth, Texture and Interfacial Segregation Leading to Ductile Failure |
Author(s) |
Shigeo Saimoto, Christopher Gabryel, Haiou Jin, Raja Mishra |
On-Site Speaker (Planned) |
Shigeo Saimoto |
Abstract Scope |
Despite the low solubility and diffusivity of iron in aluminum, industrial annealing of wrought aluminum is done at or above 340°C for complete recrystallization. Cube textured aluminum capacitor foils are annealed at ~220°C followed by a second annealing at 530°C. This study addresses the underlying cause behind such practices. Pure aluminum samples were pre-strained to ~25%, annealed at 230°C or higher, cold rolled and recrystallized. Iron solute content after annealing at 230°-300°C was 0.014-0.170 ppm and cold rolled samples recrystallized to ~1 µm grains at 60°C. Similar studies were done in AA1100, AA6063 and AA5754. The key finding was at 335°C, in all cases, either ultra-fine Al6Fe precipitates formed or pre-existing ones dissolved. The relationship between texture evolution and Fe segregation to grain boundaries resulting in solute and particle drag and to micro-particles that act as nuclei for de-cohesion will be discussed and smart processing guidelines will be described. |
Proceedings Inclusion? |
Planned: Light Metals |
Keywords |
Aluminum, Characterization, Other |