arXiv 2608.04649cond-mat.mtrl-sci

冲击压缩多晶MgO中的纳秒尺度塑性：100 GPa以上机制转变的证据

Nanosecond timescale plasticity in shock-compressed polycrystalline MgO: evidence for transition in mechanism above 100 GPa

A. Chakraborti, H. Ginestet, F. Bertrand, J. Chantel, S. Merkel, M. Harmand, S. Pandolfi, A. Amouretti, M. Andrzejewski, K. Appel, E. Barraud, A. B. Belonoshko,… 展开作者

A. Chakraborti, H. Ginestet, F. Bertrand, J. Chantel, S. Merkel, M. Harmand, S. Pandolfi, A. Amouretti, M. Andrzejewski, K. Appel, E. Barraud, A. B. Belonoshko, E. Brambrink, K. Buakor, C. Camarda, O. Castelnau, D. M. Cheshire, G. Collins, T. E. Cowan, C. Crépisson, J. Deng, X. Fang, M. Fitzgerald, A. Gleason, F. Hanby, N. J. Hartley, P. G. Heighway, H. Höppner, N. Jaisle, J. Kim, Z. Konopkova, D. Kraus, A. Krygier, L. Libon, C. M. Lonsdale, S-N. Luo, W. Lynn, M. Masruri, E. E. McBride, D. McGonegle, J. D. McHardy, M. I. McMahon, R. S. McWilliams, T. Michelat, B. Nagler, M. Nakatsutsumi, A-M. Norton, I. Ocampo, I. I. Oleynik, C. Otzen, S. E. Parsons, D. J. Peake, A. Pelka, A. Phelipeau, C. Prescher, T. R. Preston, N. Pulver, L. Rogal, J-P. Schwinkendorf, G. Shoulga, R. F. Smith, S. Singh, C. N. Somarathna, T. Stevens, C. V. Storm, C. Strohm, T-A. Suer, M. Tang, A. Tipeev, M. Toncian, T. Toncian, U. Trdan, T. Tschentscher, J. D. Umpleby-Thorp, L. Wang, J. S. Wark, A. Descamps, A. Higginbotham, T. M. Hutchinson, C. McGuire, A. Sollier, G. Morard, J. H. Eggert

首次发表 2026-08-06

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中文总结 AI 辅助

本研究以多晶MgO为对象，结合激光驱动冲击压缩与超快诊断技术及EVPSC模拟，发现其在95至175 GPa间主导滑移系随压力转变，为高速冲击下多晶陶瓷变形动力学提供新观测窗口。

中文摘要 AI 辅助

陶瓷在极端条件下的力学性能直接影响从航天器屏蔽、核聚变面向等离子体材料设计到理解行星深部流变学等应用。本研究以多晶MgO为模型陶瓷，探究此类材料在极端应变速率下的高压-高温力学行为。研究利用激光驱动的冲击压缩，沿主雨贡纽曲线达到175(15) GPa的压力，并结合欧洲X射线自由电子激光的超快诊断技术，探测随压力-温度条件变化的主导变形机制。这些近瞬时的时间分辨快照，与弹黏塑性自洽（EVPSC）模拟相结合，有力表明MgO在纳秒尺度进入塑性状态，且在95至175 GPa之间，主导滑移系随压力发生转变。本研究为高速冲击下多晶陶瓷的变形动力学提供了新的直接观测窗口。

英文摘要

The mechanical properties of ceramics under extreme conditions directly impact applications ranging from shielding spacecrafts, designing plasma facing materials in nuclear fusion to understanding the rheology of deep planetary interiors. Here, we use polycrystalline MgO as a model ceramic to understand the high-pressure-temperature mechanical behaviour of such materials under extreme strain rates. We use laser-driven shock compression up to 175(15) GPa on the principal Hugoniot along with ultrafast diagnostics at the European X-ray Free Electron Laser to probe the dominant deformation mechanisms with changing P -T conditions. These near-instantaneous time-resolved snapshots, coupled with elasto-viscoplastic self-consistent (EVPSC) simulations, strongly suggest that MgO attains plastic regime in the nanoseconds scale accompanied by a pressure-mediated change in dominant slip system between 95 and 175 GPa. This work provides a new direct window into the deformation dynamics of polycrystalline ceramics under high-velocity impacts.