Annealing, quenching and heat treatment of magnesium
Low rate of diffusion processes in the solid magnesium even at low cooling rates result in non-equilibrium conditions of crystallization to the development of dendritic segregation), and dendritic liquation — to reduce the mechanical strength and technological ductility. Therefore, before deformation, the alloy is subjected to homogenizing annealing.
Lowers the strength but increases the ductility of magnesium alloys and to a large extent eliminates the anisotropy of properties of semi-finished products in the longitudinal and transverse directions. Choose the temperature of this annealing is necessary to consider the tendency to grain growth at elevated temperatures. The temperature of beginning of recrystallization of pure magnesium equal to about 150 °C, and magnesium alloys 250−280°C. Therefore magnesium alloys are typically annealed at a temperature of 350 °C, because higher temperatures lead to grain growth.
Annealing to relieve residual stresses
Is carried out at temperatures lower than used for recrystallization annealing, immediately after processing, creating residual stresses.
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