一种椭圆截面螺旋等通道挤压制备超细晶材料的新工艺

摘要

近年来,对剧烈塑性变形法制备块体超细晶(UGF)材料的研究已成为材料科学领域的一大热点.基于剧烈塑性变形制备超细晶材料的机理研究,提出了一种新型成形技术——椭圆螺旋等通道挤压法(ECEA).本文系统地阐述了ECEA的基本原理、工艺特点和变形过程,给出了ECEA累积等效应变的解析解计算式.通过有限元模拟,分析了ECEA工艺的应变场、应力场和流变速度场.指出了ECEA良好的工业应用前景.%The basic principles, characteristics, and deformation behaviors of ECEA have been introduced in the text. The design formula for accumulating equivalent strain of ECEA has been put forward. Through FEM simulation, the strain field, stress field and flow velocity field of ECEA technique have been analyzed. The good application prospect of ECEA in industry has been pointed out.