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MB15是含5.0～6.0%Zn、0.3～0.9%Zr的高强度变形镁合金,与苏联的 MA14、美国的 ZK60A 合金成分接近,在航空工业上主要用作受力较大的零件,如机翼长桁、翼肋、摇臂等。该合金不能在冷态下变形,高温下由于滑移面增加,塑性有所提高,如热挤棒材在室温下的延伸率为14.8%,而在300℃时为62%。如果温度控制不好,就会产生废品。因此,研究其超塑性变形条件具有一定的意义,不但提高塑性,而且在超塑性条件下,可一次完成复杂零件的精密模锻。
MB15 is a high-strength deformed magnesium alloy containing 5.0-6.0% Zn and 0.3-0.9% Zr. It is close to the composition of the Soviet Union’s MA14 and the United States’s ZK60A alloy. It is mainly used in the aviation industry as a component subjected to large forces such as a wing Stringer, rib, rocker and so on. The alloy can not be deformed in cold state. Due to the increase of sliding surface, the plasticity is improved at high temperature. For example, hot-extruded bar has elongation of 14.8% at room temperature and 62% at 300 ° C. If the temperature control is not good, it will produce waste. Therefore, the study of its superplastic deformation conditions have a certain significance, not only to improve the plasticity, but also in the superplasticity conditions, can be completed once complex parts precision die forging.