多轴压缩下高取向 Ti3SiC2 的动态强度和碎裂情况

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2024-10-22 DOI:10.1016/j.jeurceramsoc.2024.116994

Xingyuan Zhao , Maxim Sokol , Michel W. Barsoum , Leslie Lamberson

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引用次数: 0

摘要

MAX 相因其独特的扭结带形成而与众不同，这是层状材料中一种独特的变形机制。本研究通过实验方法探讨了全局晶粒取向 c 轴、应变速率和应力状态对高取向 Ti3SiC2 压缩响应的影响。在 102 s-1 应变速率下，采用 Kolsky（或 split-Hopkinson）棒评估单轴和双轴（平面约束）条件下的动态压缩响应。加载过程中的宏观超高速可视化和死后的微观断裂图显示，约束状态对宏观破坏模式和微观断裂机制都有显著影响。值得注意的是，在晶粒边缘施加动态载荷和沿层施加 80 兆帕平面约束的双轴加载条件下，观察到的动态抗压强度最高（1636 ± 136 兆帕），与非约束单轴动态条件相比提高了 66%。平面约束似乎能延缓裂纹扩展并增强非弹性变形。

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Dynamic strength and fragmentation of highly oriented Ti3SiC2 under multiaxial compression

MAX phases are distinguished by their unique kink band formation, a distinct deformation mechanism in layered materials. This study explores the influence of global grain orientation c-axis, strain rate, and stress state on the compressive response of highly oriented Ti₃SiC₂ through experimental methods. A Kolsky (or split-Hopkinson) bar is employed to evaluate the dynamic compressive response under uniaxial and biaxial (planar confinement) conditions under 10² s⁻¹ strain rate. Macroscopic ultra-high-speed visualization during loading and microscopic post-mortem fractography reveal that confinement states significantly impact both macroscopic failure patterns and microscopic fracture mechanisms. Notably, biaxial loading with dynamic load edge-on to the grains and 80 MPa planar confinement along the layers resulted in the highest dynamic compressive strength observed (1636 ± 136 MPa), a 66 % increase compared to the unconfined uniaxial dynamic condition. The planar confinement appears to delay crack propagation and enhance inelastic deformation.

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.