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Deformation field and texture analysis in T-ECAP using a flow function
Materials Characterization ( IF 4.7 ) Pub Date : 2021-01-16 , DOI: 10.1016/j.matchar.2021.110912
A. Hasani , M. Sepsi , S. Feyzi , L.S. Toth

A variant of the equal channel angular pressing (ECAP) process, the so-called T-ECAP is examined in this work. In T-ECAP the material is pushed from one channel into another one, which is open in the two perpendicular flow direction. With the help of a new flow line function, the deformation field is examined in details. The proposed flow function contains just one additional parameter compared to the previous one which was used to describe the material flow during non-equal channel angular pressing (NECAP). The new parameter permits to extend the flow line into the exit channel; outside the intersection zone of the two channels. This improvement is based on experimental flow lines obtained in T-ECAP of aluminum. The new flow function was employed to analyze the experimental flow trajectories and to characterize the corresponding plastic deformation field. The evolution of the crystallographic texture was also simulated using the new flow function. The gradient in the texture across the thickness of the extruded sample was examined and simulated. Excellent agreement was obtained between the simulated and experimental crystallographic textures in T-ECAP of Al-1050, validating in this way the proposed flow function.



中文翻译:

使用流函数的T-ECAP中的变形场和纹理分析

在这项工作中,研究了等通道角挤压(ECAP)工艺的一种变体,即所谓的T-ECAP。在T-ECAP中,物料从一个通道推入另一个通道,该通道在两个垂直的流向上打开。借助新的流线功能,将详细检查变形场。与用于描述非等通道角挤压(NECAP)期间物料流的前一个参数相比,拟议的流量函数仅包含一个附加参数。新的参数允许将流线延伸到出口通道中。在两个通道的交叉区域之外。该改进基于铝的T-ECAP中获得的实验流线。使用新的流动函数来分析实验流动轨迹并表征相应的塑性变形场。还使用新的流动函数模拟了晶体织构的演变。检查并模拟了整个挤压样品厚度上的织构梯度。在Al-1050的T-ECAP中,模拟和实验晶体学织构之间获得了极好的一致性,从而验证了所提出的流动函数。

更新日期:2021-01-31
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