Homogenization annealing.

The low rates of diffusion processes in solid magnesium, even at low cooling rates, lead under nonequilibrium crystallization to the development of dendritic liquation) and dendritic liquation leads to a decrease in mechanical strength and technological plasticity. Therefore alloys are subjected to homogenization annealing before deformation.

Recrystallization annealing

Reduces strength, but increases ductility of magnesium alloys and largely eliminates the anisotropy of properties of semi-finished products in the longitudinal and transverse directions. When selecting the mode of this annealing it is necessary to take into account the propensity for grain growth at elevated temperatures. The recrystallization start temperature of pure magnesium is approximately 150 °C, while that of magnesium alloys is 250-280 °C. Therefore, magnesium alloys are usually annealed at 350 °C, since higher temperatures lead to grain growth.

Annealing for removal of residual stresses

Carried out at temperatures lower than those used for recrystallization annealing immediately after a residual stress treatment.

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