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- W3122420171 abstract "高功率激光可通过直接烧蚀产生高温、高压、高应变率的物质状态, 同时也可驱动金属箔产生与之精密同步的超短超强X射线源, 成为利用原位X射线衍射技术研究材料在极端高温、高压、高应变率下相变动力学的重要实验平台. 本文基于原型高功率激光装置建立高压、高应变率加载下材料相变的原位X射线衍射诊断平台, 并以典型金属钒和铁为例开展冲击相变的原位观测. 实验表明, 在高应变率(<inline-formula><tex-math id=M1>begin{document}$ {10^{8}} —{10^{9}};{{rm{s}}^{ - 1}} $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=24-20200929_M1.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=24-20200929_M1.png/></alternatives></inline-formula>)冲击加载下, 金属钒在69 GPa时依然保持体心立方结构不变, 而金属铁在159 GPa时已经由体心立方结构转变为六角密排结构, 均与文献报道一致. 同时原位X射线衍射实验测量的材料压缩特性与宏观Hugoniot曲线符合得很好. 利用原位X射线衍射技术研究高应变率动态加载下材料的相变行为对理解材料相变的应变率效应和动力学过程具有重要的科学意义, 同时对提高材料工程服役的可靠性以及突破材料极端环境服役的发展瓶颈具有重要的工程价值." @default.
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- W3122420171 date "2020-01-01" @default.
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- W3122420171 title "<i>In situ</i> observation of phase transition in polycrystalline under high-pressure high-strain-rate shock compression by X-ray diffraction" @default.
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