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首页> 美国卫生研究院文献>Materials >In-Situ Observation of Fracture Behavior of Ti-Aluminide Multi-Layered Composites Produced by a Hybrid Sintering Process
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In-Situ Observation of Fracture Behavior of Ti-Aluminide Multi-Layered Composites Produced by a Hybrid Sintering Process

机译：混合烧结法制备Ti-铝化物多层复合材料断裂行为的原位观察

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The fabrication of Ti-aluminide multi-layered composites have attracted great attention for their excellent mechanical properties, such as high specific strength, high specific stiffness, tolerable toughness, and low density. The preparation of the composite produced by a hybrid procedure composed of Vacuum Hot Pressing (VHP) and Hot Isostatic Pressing (HIP) using Ti foils and Al foils has been performed. Further, X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) equipped with Energy Dispersive X-ray Spectrometry (EDXS) were carried out to identify the microstructure and phase formation of the composite. In addition, an in-situ three-point bending test was conducted on the notched specimen to observe the crack propagation behavior carefully. The results indicate that the densified composite was obtained without any apparent voids and pores which could undesirably develop into the source of cracks. Furthermore, all the pure Al foils were totally consumed to form a series of the Ti-Al compounds through the diffusive reaction between the adjacent Ti and Al foils. Moreover, the in-situ observation demonstrates the initiation and propagation of cracks in the intermetallic layers and the role of residual Ti layers to blunt and bridge the cracks by their plastic deformation. This study provides a new strategy for fabricating the Ti-aluminide multi-layered composites.
机译：Ti-铝化物多层复合材料的制备因其优异的机械性能而备受关注，例如高比强度，高比刚度，可耐受的韧性和低密度。已经进行了通过混合工艺制备的复合材料的制备，该混合工艺包括使用Ti箔和Al箔的真空热压（VHP）和热等静压（HIP）。此外，进行了配备有能量色散X射线光谱法（EDXS）的X射线衍射（XRD）和扫描电子显微镜（SEM）以鉴定复合物的微观结构和相形成。另外，对缺口试样进行了原位三点弯曲试验，以仔细观察裂纹的扩展行为。结果表明，获得的致密化复合材料没有任何明显的空隙和孔，这些空隙和孔可能不合需要地发展成裂纹源。此外，所有纯净的铝箔通过相邻的钛箔和铝箔之间的扩散反应被完全消耗掉，形成一系列的钛铝化合物。此外，原位观察表明，裂纹在金属间化合物层中产生和扩展，残余的Ti层通过塑性变形钝化和桥接裂纹。这项研究为制备钛铝多层复合材料提供了一种新的策略。

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