Nano-scale mapping of lattice strain and orientation inside carbon core SiC fibres by synchrotron X-ray diffraction
Nano-scale mapping of lattice strain and orientation inside carbon core SiC fibres by synchrotron X-ray diffraction
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DOI：
10.1016/j.carbon.2014.07.045
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发表时间：
2014-11
期刊：
影响因子：
10.9
通讯作者：
N. Baimpas;A. Lunt;I. Dolbnya;J. Dluhoš;A. Korsunsky
中科院分区：
文献类型：
--
作者：
N. Baimpas;A. Lunt;I. Dolbnya;J. Dluhoš;A. Korsunsky
目前最强的纤维是碳基纤维，由碳纳米管 (CNT) 或还原氧化石墨烯薄片 (RGOF) 制成。碳纤维（CF）在半个世纪前首次开发出来。对热、化学和机械加工的控制可以获得所需的结构、强度和刚度组合。在实际使用中，CF 通常被纳入需要多尺度表征的更大规模系统中。在本研究中，我们考虑了一种航空航天复合材料，该复合材料由钛合金基体和碳单丝芯单向碳化硅纤维增强而成。通过将基于同步加速器的成像和纳米聚焦 X 射线束散射与聚焦离子束应力评估相结合，我们构建了该材料内部结构和应变的详细图。使用特征应变建模来重建纤维横截面内的完整残余应变状态。实验和理论相结合的方法可以提取纳米级的纤维结构信息，深入了解其加工历史，并揭示对CF的使用性能产生强烈影响的显着残余应变的存在。
The strongest fibres available today are carbon-based, made from carbon nanotubes (CNTs) or reduced graphene oxide flakes (RGOFs). Carbon fibres (CFs) were first developed half a century ago. Control of the thermal, chemical and mechanical processing allows obtaining desired combination of structure, strength and stiffness. In practical use, CFs are typically incorporated into larger scale systems that require multi-scale characterisation. In the present study we considered an aerospace composite consisting of titanium alloy matrix reinforced with unidirectional silicon carbide fibres with carbon monofilament core. By combining synchrotron-based imaging and nano-focused X-ray beam scattering with Focused Ion Beam stress evaluation, we construct detailed maps of structure and strain inside this material. Eigenstrain modelling was used to reconstruct the full residual strain state within the fibre cross-section. The joined-up experimental and theoretical approach allows extracting information about fibre structure down to the nanoscale, developing insight into its processing history, and revealing the existence of significant residual strains that have a strong effect on the performance of CFs in service.