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首页> 外文期刊>Journal of Materials Engineering and Performance >Microhardness Distribution and Microstructural Evolution in Pure Aluminum Subjected to Severe Plastic Deformation: Elliptical Cross-Sectioned Spiral Equal-Channel Extrusion (ECSEE)
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Microhardness Distribution and Microstructural Evolution in Pure Aluminum Subjected to Severe Plastic Deformation: Elliptical Cross-Sectioned Spiral Equal-Channel Extrusion (ECSEE)

机译：经受严重塑性变形的纯铝中的显微硬度分布和显微组织演变：椭圆截面螺旋等通道挤压（ECSEE）

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摘要

Elliptical cross-sectioned spiral equal-channel extrusion (ECSEE), one of the severe plastic deformation techniques, is of great efficiency in producing bulk ultrafine or nanostructured materials. In this paper, the simulation and experimental researches on ECSEE of high-purity aluminum were conducted to investigate the equivalent strain distribution and microhardness distribution on three orthogonal planes, as well as microstructural evolution. Simulation result shows a significant strain gradient on three planes. Microhardness tests comprise the similar results to strain distribution. According to transmission electron microscopy (TEM) results, microstructural evolution ranged from coarse structures to ultrafine structures by undergoing the shear bands, subgrains, high-angle misorientation grain boundaries and equiaxed structures. There are also some distinctions with reference to grain refinement level, grain boundary styles and dislocation distribution on different positions. The TEM investigations are in good agreement with microhardness tests.
机译：椭圆截面螺旋等通道挤压（ECSEE）是严重的塑性变形技术之一，在生产块状超细或纳米结构材料方面非常有效。本文对高纯铝的ECSEE进行了仿真和实验研究，以研究在三个正交平面上的等效应变分布和显微硬度分布，以及显微组织的演变。仿真结果显示了三个平面上的显着应变梯度。显微硬度测试包括与应变分布相似的结果。根据透射电子显微镜（TEM）的结果，通过经历剪切带，亚晶粒，大角度取向差的晶界和等轴结构，微观结构的变化范围从粗糙结构到超细结构。关于晶粒细化程度，晶界样式和不同位置的位错分布，也有一些区别。 TEM研究与显微硬度测试非常吻合。

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