The Study of the Behavior of Constrained Groove Pressed Magnesium Alloy after Heat Treatment
M. Ziminaa, J. Bohlen b, D. Letzig b, G. Kurz b, M. Poková a, M. Knapek a, J. Zrník c and M. Cieslar a
aCharles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 5, 12116, Prague, Czech Republic
bMagnesium Innovation Centre (MagIC) Helmholz Zentrum Geesthacht, Max-Planck Str. 1, D21502 Geesthacht, Germany
cCOMTES FHT a.s., Průmyslová 995, Dobřany 334 41, Czech Republic
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In this work twin-roll cast AZ31 magnesium strip of thickness 5.6 mm was subjected to the heat treatment and further constrained groove pressing. A comparison of the microstructure and microhardness of as-cast, constrained groove pressed and annealed material was carried out. The twin-roll cast strip exhibits an inhomogeneous structure which is replaced by a finer and uniform: recrystallized one after aging at 450°C for 10 h. A significant increase of the microhardness was observed accompanied by a pronounce grain refinement. Nevertheless, the distribution of the grain size is unequal along the specimen width. Thermal stability of the deformed structure during subsequent annealing was investigated. It was shown that higher annealing temperatures result in a formation of a more uniform recrystallized structure and in a significant drop of microhardness down to the values obtained for as-cast alloy.

DOI: 10.12693/APhysPolA.128.775
PACS numbers: 62.20.F-, 62.20.Qp, 81.05.Bx, 81.05.Zx