Intrinsic kink bands strengthening induced by several wrought-processes in Mg-Y-Zn alloys containing LPSO phase
Intrinsic kink bands strengthening induced by several wrought-processes in Mg-Y-Zn alloys containing LPSO phase
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DOI：
10.1016/j.matchar.2021.111348
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发表时间：
2021-09
影响因子：
4.7
通讯作者：
H. Somekawa;D. Ando;K. Hagihara;M. Yamasaki;Y. Kawamura
中科院分区：
文献类型：
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作者：
H. Somekawa;D. Ando;K. Hagihara;M. Yamasaki;Y. Kawamura
使用在中温和高温（373 K 和超过 673 K）下通过口径轧制或挤压生产的 Mg-9at.%Y-6at.%Zn 合金研究扭结带强化效果。微观结构观察结果表明，无论锻造加工方法和加工温度如何，所有合金都会引起变形扭结带。显微维氏硬度测试表明，包含扭结带的区域比没有扭结带的区域表现出更高的硬度，这揭示了内在的扭结带强化。有趣的是，这种扭结带强化效应的趋势可以通过经验关系来表达，该经验关系被分为与锻造加工温度相关的两条线。这种趋势似乎并不取决于锻造加工方法。在中间温度下生产的合金显示出明显优异的硬度，因为除了扭结带强化之外，扭结边界周围的残余应变/位错也有助于阻碍位错滑移。
The kink bands strengthening effect was investigated using Mg-9at.%Y-6at.%Zn alloys produced by caliber rolling or extrusion at intermediate and elevated temperatures (373 K and more than 673 K). The results of microstructural observations showed that deformation kink bands were induced in all the alloys, regardless of the wrought-processing method and the processing temperatures. Micro-Vickers hardness tests showed that the regions including kink bands exhibited a higher hardness than those without kink bands, which reveal intrinsic kink bands strengthening. Interestingly, the trend of this kink bands strengthening effect could be expressed by an empirical relationship, which was divided into two lines associated with the wrought-processing temperature. This tendency did not appear to depend on the wrought-processing method. The alloys produced at the intermediate temperature showed markedly superior hardness, since, in addition to the kink bands strengthening, the residual strains/dislocations around kink boundaries contributed to obstruct dislocation slips.