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首页> 外文期刊>Journal of Materials Engineering and Performance >Micro-structural Evolution in Metals Subjected to Simple Shear by a Particular Severe Plastic Deformation Method
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Micro-structural Evolution in Metals Subjected to Simple Shear by a Particular Severe Plastic Deformation Method

机译：特殊严重塑性变形方法对简单剪切作用下金属的微观组织演化

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摘要

Simple shear (SS) has been considered an optimal deformation method of severe plastic deformation (SPD). To achieve SS, a particular SPD method known as mutative channel torsion extrusion (MCTE) was designed based on the geometric equivalence of SS, and the cavity parameters of a die were calculated according to strain equivalence. To investigate the characteristics of micro-structural evolution subjected to MCTE, simulated and experimental investigations were conducted. The simulated results indicate that equivalent strain distribution on the cross section is relatively uniform, and the metallographic observations confirm the simulated phenomenon. Transmission electron microscopy investigations show that the process of grain refinement undergoes the formation of shear bands, dislocation cells, dislocation forests, large-angle grain boundaries, and recrystallization nuclei. Two types of mechanisms are proposed in view of the different effects of SS on grain refinement. Eventually, MCTE is ensured as an effective method for grain refinement.
机译：简单剪切（SS）被认为是严重塑性变形（SPD）的最佳变形方法。为了获得SS，根据SS的几何当量设计了一种特殊的SPD方法，称为突变通道扭转挤压（MCTE），并根据应变当量计算了模具的型腔参数。为了研究经受MCTE的微观结构演变的特征，进行了模拟和实验研究。仿真结果表明，该截面的等效应变分布相对均匀，金相观察证实了该现象。透射电子显微镜研究表明，晶粒细化的过程经历了剪切带，位错单元，位错森林，大角度晶界和重结晶核的形成。针对SS对晶粒细化的不同影响，提出了两种机理。最终，MCTE被确保为晶粒细化的有效方法。

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