中文摘要：

以便学习影响死连续可变剖面图上的联合在挤出过程的直接挤出 CVCDE，积聚的紧张公式被导出，并且各种各样的阶段的挤出比率直接由公式决定相应阶段紧张的尺寸，这能被知道。在这份报纸，作为二过渡期间的一个例子死，三死不同角度的联合和挤出比率被设计。航空镁合金 ZM6 被学习，并且当连续时，结果证明动态再结晶是甚至更完全的砍变丑发生，以便微观结构的精炼和 homogenization 被获得。由使用不同死联合，在一样的条件下面的积聚的紧张增加总计挤出比率。因此，挤出变丑的精制水晶的加强的效果能进一步被分析。由于死了地区的缺点，实际积聚的紧张显著地减少，微观结构和表演改进的效果也与它减少。因此，最佳的设计死联合是 CVCDE 的进程和产品的关键，它为严重塑料的开发提供一个科学基础变丑。

英文摘要：

In order to study the influence of die combination on continuous variable cross-section direct extrusion （CVCDE） in the extrusion process, the accumulative strain formula is derived, and it can be known that the extrusion ratio of various stages directly determines the size of corresponding stage strain by formula. In this paper, as an example of the two interim dies, three die combinations of different angles and extrusion ratio are designed. Aviation magnesium alloy ZM6 is studied, and the results show that dynamic recrystallization is even more complete when continuous shear deformation occurs, so that the refinement and homogenization of microstructure are obtained. By the use of different die combinations, the accumulative strain increases under the conditions of same total extrusion ratio. Thus, the refined crystalline strengthening effect of extrusion deformation can be further analyzed. Due to the dead-zone defects, the actual accumulative strain decreases significantly and the effect of microstructure and performance improvements also decreases with it. Therefore, the optimal design of die combination is the key to the process and product of CVCDE, which provides a scientific basis for the development of severe plastic deformation.