等径角挤压过程中施加背压可以有效的控制和改善材料的微观组织和机械性能.运用有限元分析方法对不同应变硬化行为材料的一道次背压EACP过程进行了模拟计算,探讨了背压对塑性变形区尺寸,塑性变形区内应变速率的分布,以及变形后试样在纵截面上应变分布的影响.背压对不同材料的影响有明显的不同:应变硬化材料(应变硬化指数n＞ 0),背压的影响是有利的,可以有效地减小塑性变形区的尺寸,使应变分布更均匀;而弹完全塑性材料(n=0),背压增大导致塑性变形区的尺寸增大,塑性应变速率分布不均匀.
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