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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Deformation mechanisms and mechanical properties of (0001) Mg-Zn-Y 18R-LPSO single crystals
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Deformation mechanisms and mechanical properties of (0001) Mg-Zn-Y 18R-LPSO single crystals

机译:(0001)Mg-Zn-Y 18R-LPSO单晶的变形机制和机械性能

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摘要

A promising Mg-Zn-Y alloy with the long-period stacking ordered (LPSO) second phase has been developed for about twenty years. Because the LPSO phase has the unique 18R crystal structure, particularly for its packing sequence along [0001], as well as it plays an important role in strengthening mechanisms, it is interesting to clarify in terms of mechanical properties and deformation mechanisms. In this study, uniaxial micro-pillar compression tests are conducted on LPSO along the [0001] direction. At the same time, nanoindentation system equipped with the Berkovich tip is used to extract the basic mechanical properties of (0001) plane. The basal dislocations are found to be activated first, causing the bending of the sample. The bending would lead to the shear stress field downward and thus would cause the nucleation and movement of prism dislocations with [0001] Burgers vector. Prism dislocations can form the fatal 45 degrees slip trace inside the micro-pillar and finally go through the whole sample causing fracture. The basal dislocations are found at the Zn6Y8-Mg interface which might be originated from the local strain field between them. (C) 2018 Elsevier B.V. All rights reserved.
机译:具有长期堆叠有序(LPSO)第二阶段的承诺Mg-Zn-Y合金已经开发了大约二十年。因为LPSO相具有独特18R晶体结构,特别是对于沿着[0001]其包装序列,以及它在强化机制中起重要作用,这是有趣的机械性能和变形机制方面澄清。在该研究中,单轴微柱压缩试验沿着[0001]方向在LPSO上进行。与此同时,配备有Berkovich Tip的纳米狭窄系统用于提取(0001)平面的基本机械性能。发现基础脱位首先被激活,导致样品的弯曲。弯曲将导致剪切应力场向下,因此将导致棱镜脱位的成核和移动与汉堡载体。棱镜脱位可以在微柱内形成致命的45度滑痕,最后通过整个样品引起骨折。基础脱位被发现在Zn6M8-Mg界面处,其可能源自它们之间的局部应变场。 (c)2018年elestvier b.v.保留所有权利。

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