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首页> 外文期刊>Materials Science and Engineering >Cracking in a hot deformed SiC_P/A6061 composite investigated using synchrotron microtomography
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Cracking in a hot deformed SiC_P/A6061 composite investigated using synchrotron microtomography

机译：使用同步加速器显微照相技术研究热变形SiC_P / A6061复合材料中的裂纹

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摘要

We present the first investigation of cracking by hot compression of any metal matrix composite in zones deforming under tri-axial state of stress using synchrotron microtomography (SRuCT). The task required to reduce the unfavourable manifestations of phase contrast in the reconstructed slices is simplified by developing a Fourier domain based filter for processing of reconstructed slices. As a result for the first time an accurate characterisation of the state of 3-D damage developed by compression at 500 ℃ and 1 s~(-1) to strains of ~1 is achieved in the bulge region of a hot worked SiC_P/A6061 composite. The composition of the damage is found to predominately consist of acicular shaped large to very large pores and "coalesced" micro-cracks. The quantification of the Fourier domain filtered dataset and the analysis of the spatial proximity of the different types of damage provided the mechanism of cracking in metal matrix composites near regions of tri-axial stress at high compressive strains. The propensity for cracking in bulge region of SiC_P/A6061 composite is attributed to the development and growth of acicularly shaped pores facilitated by repeated particle fragmentation. It results in a damage architecture that promotes the coalescence of the closely spaced pores and micro-cracks. This mechanism rationalises the high efficiency of power dissipation observed in hot working of SiC_P/A6061 composite in the absence of microstructural restoration processes.
机译：我们目前对通过同步压缩显微照相术（SRuCT）在三轴应力状态下变形的区域中的任何金属基复合材料进行热压裂而进行的开裂研究。通过开发用于处理重建切片的基于傅立叶域的滤波器，简化了减少重建切片中相衬的不利表现所需的任务。结果首次在热加工的SiC_P / A6061的凸出区域实现了对500℃和1 s〜（-1）的应变对〜1应变产生的3-D损伤状态的精确表征。综合。发现损伤的组成主要由针状形状的大到非常大的孔和“聚集的”微裂纹组成。傅立叶域滤波数据集的量化和不同类型损伤的空间邻近性分析提供了在高压缩应变下三轴应力区域附近金属基复合材料开裂的机制。 SiC_P / A6061复合材料的隆起区域开裂的倾向归因于反复颗粒破碎促进针状孔的发展和增长。它导致了破坏结构的发展，该结构促进了紧密间隔的孔和微裂纹的合并。这种机制使在没有微观结构恢复过程的情况下，在SiC_P / A6061复合材料的热加工中观察到的高功耗效率合理化。

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