影响铝镁合金5052铝板再结晶温度的因素

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1、 变形程度
冷变形程度是影响再结晶温度的重要因素。当铝镁合金5052铝板的退火时间一定（一般为1H）时，变形程度和再结晶起始温度随冷变形程度的增加而增加。金属中储存的能量越多，再结晶驱动力越大，再结晶起始温度越低。同时，随着铝镁合金5052铝板变形程度的增加，完成再结晶过程所需的时间相应缩短。当变形程度达到一定值时，再结晶起始温度趋于稳定值。但当变形程度较小时，再结晶温度趋于金属熔点，即不发生再结晶过程。

1、 Deformation degree

The degree of cold deformation is an important factor affecting the recrystallization temperature. When the annealing time of aluminum magnesium alloy 5052 aluminum plate is certain (generally 1H), the deformation degree and recrystallization start temperature increase with the cold deformation degree. The more energy stored in the metal, the greater the driving force of recrystallization and the lower the recrystallization start temperature. At the same time, with the increase of deformation degree of aluminum magnesium alloy 5052 aluminum plate, the time required to complete the recrystallization process is shortened accordingly. When the deformation degree reaches a certain value, the recrystallization starting temperature tends to a stable value. However, when the deformation degree is small to a certain extent, the recrystallization temperature tends to the metal melting point, that is, there will be no recrystallization process.
If the deformation degree is very small, there are few recrystallization nuclei and a long incubation period, coarse grains will be formed after annealing. If the deformation degree is gradually reduced to the minimum, that is, to reach the critical deformation degree, that is, to reach the minimum deformation degree that can be recrystallized, the grains formed after recrystallization are the coarsest and the minimum deformation degree that can lead to recrystallization is called the critical deformation degree (or critical deformation degree). In wrought aluminum alloy, when the deformation degree is in the range of 315%, the recrystallized grains will increase sharply.
2、 Annealing time
Annealing time is another important factor for aluminum magnesium alloy 5052 aluminum plate. The recrystallization temperature decreases with the increase of annealing time.
3、 Heating speed
If the heating rate is too slow or too fast, the recrystallization temperature tends to increase. When the heating speed is very slow, the deformed metal of aluminum magnesium alloy 5052 aluminum plate has enough time to recover during the heating process, so as to reduce the energy storage, reduce the driving force of recrystallization and increase the recrystallization temperature. If the heating speed is too fast, it will also increase the metal recrystallization temperature. The reason is that it takes time for recrystallization nucleation and growth. If the heating speed is too fast, the residence time at different temperatures is short, making it too late for nucleation and growth, so the recrystallization temperature is delayed.
When other conditions are the same, the workpiece heated to the annealing temperature quickly can generally obtain fine grains, while when heated slowly, the grains are easy to grow. Because in the slow heating process, due to the influence of the recovery process, almost all the lattice distortion is eliminated, and the number of recrystallized cores is significantly reduced.
Aluminum magnesium alloy 5052 patterned aluminum plate
4、 Alloy composition
In the range of solid solution, the addition of a small amount of elements can usually sharply increase the recrystallization temperature. The purer the metal, the more obvious the effect of a small amount of elements. As the element concentration continues to increase, the increment of recrystallization temperature gradually decreases, and basically does not change after reaching a certain concentration, and sometimes even begins to decrease. The minimum of recrystallization temperature may be reached near the solid solution line.