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首页> 外文期刊>Materials Science and Engineering >Inducement of kink-band formation in directionally solidified Mg/Mg_(17)Al_(12) eutectic alloy - Inspired by the deformation behavior of the long-period stacking ordered (LPSO) phase
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Inducement of kink-band formation in directionally solidified Mg/Mg_(17)Al_(12) eutectic alloy - Inspired by the deformation behavior of the long-period stacking ordered (LPSO) phase

机译：在定向凝固的Mg / mg_（17）Al_（12）共晶合金的方向上凝固的Kink带形成 - 激发了由长期堆叠有序（LPSO）相的变形行为的启发

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摘要

Kink-band formation has received significant attention, especially in the Mg-based long-period stacking ordered (LPSO) phase which increases the strength and ductility of Mg alloys. However, its formation criteria are not understood. Recent studies suggested that unique LPSO crystal structure, which is constructed by alternative stacking of soft and hard layers, is a plausible factor governing the kink-band formation. To confirm this assumption, we examined the deformation behavior of a directionally solidified Mg/Mg_(17)Al_(12) eutectic alloy with lamellar microstructure as a model material. Consequently, kink-band formation was indeed confirmed when stress was applied parallel to the lamellar interface. Interestingly, the hard Mg_(17)Al_(12) phase rather than the soft Mg phase was found to predominately govern the kink-band formation behavior, contrary to the expectation. This must be because the easiest slip plane in Mg_(17)Al_(12) is nearly parallel to the lamellar interface, which is not the case in Mg. The obtained results show that restricting the shear deformation direction in the material is the most important factor to induce kink-band formation. Furthermore, the distribution of a kink band could be controlled by introducing primary Mg_(17)Al_(12) grains. The results provide new insight into a strategy for the aggressive use of kink band to improve the mechanical properties of structural materials.
机译：Kink带形成受到显着的关注，特别是在基于MG的长周期堆叠有序（LPSO）相中，这增加了Mg合金的强度和延展性。但是，不明白其形成标准。最近的研究表明，通过替代堆叠软硬层构造的独特LPSO晶体结构是一种控制扭结结构的合理因素。为了确认这一假设，我们检查了具有层状微观结构作为模型材料的定向固化的Mg / mg_（17）Al_（12）共晶合金的变形行为。因此，当应力平行于层状界面时，确实确认了扭结带形成。有趣的是，发现硬mg_（17）Al_（12）相而不是软MG相位，以达到扭结形成行为，与期望相反。这必须是因为MG_（17）AL_（12）中最简单的滑动平面几乎平行于板膜界面，这不是MG中的情况。所得结果表明，限制材料中的剪切变形方向是诱导扭结扭结形成的最重要因素。此外，可以通过引入主MG_（17）AL_（12）颗粒来控制扭结频带的分布。结果提供了新的洞察力，以改善结构材料的机械性能，以改善扭结的策略。

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