A Mathematical Model of Deformation under High Pressure Torsion Extrusion
A Mathematical Model of Deformation under High Pressure Torsion Extrusion
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DOI：
10.3390/met9030306
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发表时间：
2019-03-08
期刊：
影响因子：
2.9
通讯作者：
Hahn, Horst
中科院分区：
文献类型：
--
作者：
Kulagin, Roman;Beygelzimer, Yan;Hahn, Horst
高压扭转挤压(HPTE)是一种很有前途的金属及合金大塑性变形新机制。它使得制造具有径向梯度超细晶结构的长制品和具有螺旋内部结构的复合材料在细观和宏观尺度上成为可能。作为一种能够实现轻量化的技术，HPTE非常有前景，特别是对于镁、铝和钛合金。本文首次提出了一种HPTE过程的分析模型，该模型可以研究各种工艺参数的作用，并计算整个样品长度上的等效应变分布。为了验证模型的正确性，利用有限元软件QForm将其预测结果与数值模拟结果进行了比较。结果表明，通过合理的模具设计和有效地利用摩擦力，可以抑制样品相对于容器壁的滑动所带来的潜在负面影响。
High pressure torsion extrusion (HPTE) is a promising new mechanism for severe plastic deformation of metals and alloys. It enables the manufacture of long products with a radial gradient ultrafine-grained structure and of composite materials with a helical inner architecture at the meso and the macro scale. HPTE is very promising as a technique enabling light weighting, especially with magnesium, aluminium and titanium alloys. For the first time, this article presents an analytical model of the HPTE process that makes it possible to investigate the role of the various process parameters and calculate the distribution of the equivalent strain over the entire sample length. To verify the model, its predictions were compared with the numerical simulations by employing the finite element software QForm. It was shown that potential negative effects associated with the slippage of a sample relative to the container walls can be suppressed through appropriate die design and an efficient use of the friction forces.