Deformation of ZrSiO4 -MgO aggregates: Deviatoric stress as a control on deformation mechanisms
Deformation of ZrSiO4 -MgO aggregates: Deviatoric stress as a control on deformation mechanisms
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ZrSiO4 -MgO 聚集体的变形：偏应力作为变形机制的控制
DOI：
10.1103/physrevb.105.l220101
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发表时间：
2022
影响因子：
3.7
通讯作者：
Miyagi, Lowell
中科院分区：
文献类型：
--
作者：
Zhou, Xiaoling;Chen, Lianyang;Yuan, Mingzhi;Lin, Feng;Ye, Tian;Zhao, Feng;Kunz, Martin;Miyagi, Lowell
多相集料的变形行为对材料设计和地球动力学的理解具有重要意义。本文研究了锆英石-MgO聚集体的变形，发现MgO的引入降低了聚集体中的总偏应力，从而控制了锆英石相的变形机制。锆石主要变形的dominantslip，然而，活动的锆石滑移的增加与引入的MgO的比例增加到聚集体，建议的实验和模拟。我们还发现，在聚集体中的锆石和MgO都保留了强烈的变形织构，这可能与硬锆石相的主导滑移系统的对称变体有关。我们的结果有助于澄清以往研究中的差异，并了解哪个相位可能主导地球科学中的地震各向异性。
Deformation behavior of multiphase aggregates has great significance for materials design and understanding the dynamics of the Earth. Here we studied the deformation of zircon ()-MgO aggregates and found that the introduction of MgO reduced overall deviatoric stress in the aggregates and thus controlled deformation mechanisms of the zircon phase. Zircon primarily deforms by a dominantslip; however, activity of zirconslip increases with the introduction of an increased ratio of MgO into the aggregates, as suggested by the experiments and simulations. We also found both zircon and MgO in the aggregates retained strong deformation texture, which is likely related to the symmetric variants of the dominant slip system of the hard zircon phase. Our results help to clarify the discrepancies in previous studies and understand which phase may dominate the seismic anisotropy in geosciences.