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利用多功能流变仪对A35 6铝合金半固态连铸坯在半固态温度下进行了静态剪切变形试验。结果表明 ,在恒定载荷作用下 ,变形速度随加载时间延长而增大 ,其最大变形量可达 12 0 %以上 ,比普通连铸坯料提高一倍以上。卸载后变形可以迅速恢复 ,残余变形量只有 10 %左右。此外 ,这种坯料在半固态温度下存在一个发生变形的临界切应力 ,其数值随保温时间的延长而减小。半固态连铸坯的流变特性可以用H1-〔N1|H2〕 -〔N2 |S〕五元件机械模型来描述 ,并随保温时间的延长而改善。
The static shear deformation test of A35 6 aluminum alloy semi-solid slab at semi-solid temperature was carried out by multi-function rheometer. The results show that under the constant load, the deformation speed increases with the increase of loading time, and the maximum deformation can reach over 12%, which is more than double than that of ordinary continuous casting. Deformation after unloading can be quickly restored, the residual deformation is only about 10%. In addition, there is a critical shear stress at the semi-solid temperature of the blank, which decreases with the increase of the holding time. The rheological properties of the semi-solid continuous casting billet can be described by a five-element mechanical model of H1- [N1 | H2] - [N2 | S], which improves with the holding time.