对LC_4超硬Al合金的形变热处理工艺进行了调整,使该合金超塑性大大提高,在510℃,初始应变速率为8.33×10~(-4)s~(-1)条件下拉伸变形,最大延伸率可以达到2100％。金相观察表明,随着应变的增加,晶粒长大,合金发生应变硬化。合金变形时的晶粒稳定性增强是导致大延伸的重要原因。
The superplasticity of the high strength and hard Al alloy LC4 was improved toa great extent by modified thermomechanic treatment. Its maximum elongation may be up to2100% under deformation with initial strain rate 8.33×10~(-4)s~(-1) at 510℃. The optical and TEMobservations of the microstructure changes revealed that with thein crease of deformation, the dis-location density increases, the grain grows and the alloy exhibits strain hardening. The excel-lent elongation of the alloy seems due to the increase of grain stability under deformation.
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