Grain Refinement after Various Thermo-Mechanical [-4pt] Treatments in AZ80 and ZK60 Magnesium Alloys
T. Ryspaeva, M. Janecekb, P. Minárikb, V. Weslingc, L. Wagnerc and R. Kralb
aKyrgyz State Technical University, 66 Mira av., 72004, Bishkek, Kyrgyzstan
bCharles University, Ke Karlovu 5, 121 16, Prague, Czech Republic
cClausthal University of Technology, Agricolastr. 6, 38678, Clausthal-Zellerfeld, Germany
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The effect of thermal processing prior to severe plastic deformation by extrusion and swaging on grain refinement in ZK60 and AZ80 alloys was studied. The alloys received in direct-chill cast condition were homogenized at 415°C and annealed (over-aged) at temperatures from 200 to 380°C. Both the direct-hill cast and over-aged conditions were extruded at T = 300°C using an extrusion ratio of ER = 19. Hot extrusion resulted in substantial grain refinement in both cases, the effect being stronger in the over-aged material. The extruded bars were severe plastically deformed at 250°C by swaging. Swaging refined further the grain size depending on the deformation ratio (number of passes). At optimal processing conditions the grain size was 450 nm and 570 nm for the AZ80 and ZK60 alloys, respectively.
DOI: 10.12693/APhysPolA.122.622
PACS numbers: 81.40.Gh, 81.07.Bc