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铝合金的超塑性是指铝合金在特定的条件下,表现出异常高的延伸率和很低的流动应力。根据试验。国产铝合金LD5和LY12其超塑性温度分别为495°±5℃和480°±5℃,延伸率可达127％和240％,流动应力只有1～2公斤/毫米~2。这种情况给金属形成带来很大的好处,使复杂形状的零件成形有了可能,可使成形压力大大降低,可以用小吨位的设备成形较大尺寸的零件。图1为铝合金棒料经超塑性一次挤压而成的零件。
Aluminum superplasticity refers to the aluminum alloy under specific conditions, showing unusually high elongation and low flow stress. According to the experiment. The superplastic temperature of domestic aluminum alloy LD5 and LY12 is 495 ° ± 5 ° C and 480 ° ± 5 ° C, respectively. The elongation reaches 127% and 240%, and the flow stress is only 1 ~ 2 kg / mm ~ 2. This situation is of great benefit to metal formation, allowing for the shaping of complex shaped parts, greatly reducing forming pressure, and the ability to form larger parts with smaller tonnage equipment. Figure 1 is a super-plastic extruded aluminum bar made of parts.