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Microstructures that form through hot deformation significantly affect the properties of a material. A l though hot ro l l ing i s o f ten per formed at recrystallization temperatures or higher, fibrous microstructures consisting of grains in a pancake shape can be produced in the rolling direction depending on the conditions1). In this case, subgrain structures often exist in the fibrous microstructures. This indicates that the subgrain structures are maintained without forming recrystallized grain structures owing to the formation of thermally stabilized substructures. Horita et al.2) investigated the thermal stability of various practical aluminum alloys by using the equal-channel angular pressing method. They reported that fine grain structures of AA5083 and AA3004 alloys are maintained up to 200°C, whereas those of AA2024 and AA7075 alloys are maintained up to 300°C. We have investigated the formation of thermally stabilized substructures of the 5000 series3), 6000 series4), and 7000 series aluminum alloys5). We found that thermally stabilized substructures are formed under rolling conditions by controlling the processing temperature and strain rate with the addition of trans i t ion e lements such as manganese and zirconium. We also identified that the fibrous structures consisting of subgrain structures have anisotropic properties with high strength and good corrosion resistance3)~5). 3000 series aluminum alloys are widely used in food and beverage cans. To improve the strength and corrosion resistance of 3000 series aluminum alloys, it is important to optimize the process conditions for obtaining thermally stabilized substructures. In the current study, the conditions of substructure formation in Al–1%Mn alloys were investigated using Effects of Impurities and Processing Conditions in Al-1%Mn Alloys on the Formation of Thermally Stabilized Substructures*

Effects of Impurities and Processing Conditions in Al–1%Mn Alloys on the Formation of Thermally Stabilized Substructures