Abstract
Under a carefully selected starting texture, Mg-3Al-1Zn (AZ31) has been successfully processed via equal channel angular processing (ECAP) at 150°C under multiple passes to obtain an ultra-fine grained bulk material. The multiple ECAP passes at 150°C decreased the grain size of bulk as-received AZ31 from 25 µm to ~0.8 µm. Upon grain refinement, the tensioncompression yield asymmetry decreased, and the yield strength increased to the level of 6000 series Al alloys. Detailed electron backscatter diffraction (EBSD) analyses clearly indicated that the formation of compression twins initiated deformation localization via softest basal slip. Subsequently, dynamic recrystallization initiated within the compression twins for temperatures at 150°C and below. Thus, the preferential sites for softest basal slip cause local softening and DRX, accumulating throughout the material in the form of large shear bands which lead to failure during ECAP.
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Dogan, E., Vaughan, M.W., Karaman, I., Proust, G., Ayoub, G., Benzerga, A.A. (2016). Microstructural Design of Mg Alloys for Lightweight Structural Applications. In: Karaman, I., Arróyave, R., Masad, E. (eds) Proceedings of the TMS Middle East — Mediterranean Materials Congress on Energy and Infrastructure Systems (MEMA 2015). Springer, Cham. https://doi.org/10.1007/978-3-319-48766-3_22
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DOI: https://doi.org/10.1007/978-3-319-48766-3_22
Publisher Name: Springer, Cham
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