Mechanical properties and anisotropy of ME20 magnesium sheet produced by unidirectional and cross rolling
Mechanical properties and anisotropy of ME20 magnesium sheet produced by unidirectional and cross rolling
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DOI：
10.1016/j.matdes.2011.03.079
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发表时间：
2011-09-01
影响因子：
8.4
通讯作者：
Gottstein, G.
中科院分区：
文献类型：
--
作者：
Li, X.;Al-Samman, T.;Gottstein, G.
研究了 90% 单向 (UR) 和交叉轧制 (CR) 含稀土镁合金 ME20 在不同轧制道次 (r.p.p) 下的显微组织和织构。在交叉轧制过程中，轧制道次之间的应变路径发生变化，与传统的单向轧制相比，这导致织构发展较弱，再结晶晶粒尺寸较细。微米尺寸的含 Ce 第二相颗粒的存在被认为有利于通过颗粒刺激成核 (PSN) 进行再结晶。在室温下研究了 UR 和 CR 轧制材料的强度和延展性方面的拉伸机械性能以及板材各向异性。 CR 样品的延展性增强，断裂伸长率提高了 26%，平均 r 值接近 1，这归因于拉伸前片材质地柔软。 (C) 2011 Elsevier Ltd. 保留所有权利。
The microstructures and textures of 90% unidirectionally (UR) and cross rolled (CR) RE-containing magnesium alloy ME20 were investigated for different reductions per rolling pass (r.p.p). During cross rolling the strain path was changed between the rolling passes which led to a weaker texture development and a finer recrystallized grain size compared to conventional unidirectional rolling. The presence of Ce-containing second phase particles with micrometric sizes is suggested to facilitate recrystallization by particle stimulated nucleation (PSN). The tensile mechanical properties in terms of strength and ductility, and also the sheet anisotropy of the UR and CR rolled materials were investigated at room temperature. CR specimens showed enhanced ductility of 26% elongation-to-fracture and an average r-value close to 1, which was attributed to the soft sheet texture prior to tension. (C) 2011 Elsevier Ltd. All rights reserved.