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根据动态材料模型,建立了固态及半固态LY11合金的加工图。利用加工图确定了试验材料热变形的流变失稳区。结果表明,半固态成形时的流变失稳区范围大于固态成形时的失稳区范围,且与应变速率有关。此外,获得了等温压缩试验参数范围内的热变形最佳工艺参数。半固态加工最佳工艺参数是加热温度为560℃,应变速率为0.0010s-1,固态加工最佳工艺参数是加热温度为400℃,应变速率为0.0010s-1。
According to the dynamic material model, a solid-state and semi-solid LY11 alloy processing diagram was established. Using the processing diagram to determine the thermal deformation of the test material rheological instability zone. The results show that the range of rheological instability zone in semi-solid forming is larger than that in solid forming, and it is related to the strain rate. In addition, the best thermal deformation process parameters were obtained within the isothermal compression test parameters. The optimum process parameters of semi-solid processing are heating temperature of 560 ℃, strain rate of 0.0010s-1, and the optimum process parameters of solid state processing are heating temperature of 400 ℃ and strain rate of 0.0010s-1.