Yue Binbin, Hong Fang, Merkel Sébastien, Tan Dayong, Yan Jinyuan, Chen Bin, Mao Ho-Kwang
Center for High Pressure Science and Technology Advanced Research, 1690 Cailun Road, Pudong, Shanghai 201203, People's Republic of China.
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Phys Rev Lett. 2016 Sep 23;117(13):135701. doi: 10.1103/PhysRevLett.117.135701. Epub 2016 Sep 21.
The pressure effects on plastic deformation and phase transformation mechanisms of materials are of great importance to both Earth science and technological applications. Zircon-type materials are abundant in both nature and the industrial field; however, there is still no in situ study of their deformation behavior. Here, by employing radial x-ray diffraction in a diamond anvil cell, we investigate the dislocation-induced texture evolution of zircon-type gadolinium vanadate (GdVO_{4}) in situ under pressure and across its phase transitions to its high-pressure polymorphs. Zircon-type GdVO_{4} develops a (001) compression texture associated with dominant slip along ⟨100⟩{001} starting from 5 GPa. This (001) texture transforms into a (110) texture during the zircon-scheelite phase transition. Our observation demonstrates a martensitic mechanism for the zircon-scheelite transformation. This work will help us understand the local deformation history in the upper mantle and transition zone and provides fundamental guidance on material design and processing for zircon-type materials.
压力对材料塑性变形和相变机制的影响对地球科学和技术应用都非常重要。锆石型材料在自然界和工业领域都很丰富；然而，目前仍没有对其变形行为的原位研究。在这里，通过在金刚石对顶砧中采用径向X射线衍射，我们原位研究了锆石型钒酸钆（GdVO₄）在压力下及其向高压多晶型转变过程中由位错引起的织构演变。锆石型GdVO₄从5 GPa开始形成与沿〈100〉{001}的主导滑移相关的（001）压缩织构。在锆石-白钨矿相变过程中，这种（001）织构转变为（110）织构。我们的观察证明了锆石-白钨矿转变的马氏体机制。这项工作将有助于我们了解上地幔和过渡带的局部变形历史，并为锆石型材料的材料设计和加工提供基础指导。
