The processing of difficult-to-work alloys by ECAP with an emphasis on magnesium alloys
The processing of difficult-to-work alloys by ECAP with an emphasis on magnesium alloys
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DOI：
10.1016/j.actamat.2007.04.043
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发表时间：
2007-08-01
期刊：
影响因子：
9.4
通讯作者：
Langdon, Terence G.
中科院分区：
文献类型：
--
作者：
Figueiredo, Roberto B.;Cetlin, Paulo R.;Langdon, Terence G.
纯金属的等通道角压制最快捷的方法是使用通道角为 90 度的模具在室温下压制。然而，当应用于硬质和难加工的合金时，这些条件可能会导致坯料破裂或大规模分割。本文使用有限元建模来探索成功压制这些更复杂材料的程序。针对应变率敏感性为 0、0.2 和 0.4 的材料，使用 90 度、110 度和 135 度的通道角开发了单独的模型。计算表明，通过增加应变率灵敏度和/或增加模具内的通道角度，可以减少或消除裂纹和分段。使用宏观损伤标准来评估每种情况所造成的损伤的大小。结果表明，预测结果与使用 ZK60 镁合金获得的实验数据非常吻合。 (c) 2007 Acta Materialia Inc. 由 Elsevier Ltd 出版。保留所有权利。
The equal-channel angular pressing of pure metals is conducted most expeditiously by pressing at room temperature using a die with a channel angle of 90 degrees. However, these conditions may lead to cracking of the billets or massive segmentation when applied to hard and difficult-to-work alloys. This paper uses finite element modeling to explore the procedures for successfully pressing these more complex materials. Separate models are developed using channel angles of 90 degrees, 110 degrees and 135 degrees for materials having strain rate sensitivities of 0, 0.2 and 0.4. The calculations show that cracking and segmentation may be reduced or eliminated by increasing the strain rate sensitivity and/ or increasing the channel angle within the die. The magnitude of the imposed damage is evaluated for each condition using a macroscopic damage criterion. It is demonstrated that the predicted results are in good agreement with experimental data obtained using a ZK60 magnesium alloy. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.