Processing and mechanical behavior of laminated titanium-titanium tri-aluminide (Ti-Al3 Ti) composites
Processing and mechanical behavior of laminated titanium-titanium tri-aluminide (Ti-Al3 Ti) composites
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DOI：
10.1016/j.msea.2005.06.067
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发表时间：
2005-10-15
期刊：
影响因子：
6.4
通讯作者：
Wang, JH
中科院分区：
文献类型：
--
作者：
Peng, LM;Li, H;Wang, JH
采用不同初始厚度的Ti箔和Al箔，通过真空反应烧结制备了Ti-Al 3 Ti叠层复合材料。铝层被完全消耗，导致良好结合的金属-金属间化合物层状复合材料的微观结构，其中Ti残余金属层与铝化物金属间化合物层交替。MIL复合材料表现出非常高程度的微观结构设计和控制。通过扫描电子显微镜（SEM）进行微观结构表征，X射线衍射（XRD）和能谱分析（EDX）表明，由于液态Al存在下Ti和Al之间通过质量扩散反应的热力学和相选择，Al 3 Ti是唯一的钛铝化物相。点弯曲试验结果表明，复合材料具有各向异性特征。当施加垂直于层合板的载荷时，它们表现出阶梯状或锯齿状的载荷-位移响应和优越的上级弯曲强度以及断裂韧性，这也取决于单个层的数量和厚度。由于裂纹沿Ti/Al 3 Ti界面沿着偏转，在层合复合材料中观察到非灾难性断裂。钛层以解理方式失效，在弯曲过程中显示出广泛的塑性变形。(c)2005 Elsevier B. V.保留所有权利。
Ti-Al3Ti laminated composites have been fabricated through reactive sintering in vacuum using Ti and Al foils with different initial thickness. The aluminum layer was completely consumed resulting in microstructures of well-bonded metal-intermetallic layered composites with Ti residual metal layers alternating with the aluminide intermetallic layers. The MIL composites exhibit a very high degree of microstructural design and control. Microstructure characterization by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and energy dispersive spectroscopy (EDX) has shown that Al3Ti is the only titanium aluminide phase due to the thermodynamics and phase selection of the reaction between Ti and Al through mass diffusion in the presence of liquid Al. The mechanical properties and fracture behavior of the fabricated laminated composites were examined through three-point bending test. The results indicated that the composites exhibited anisotropic features. When the load perpendicular to the laminates was applied, they displayed a step-like or saw-tooth load-displacement response and superior flexural strength as well as fracture toughness, which is also dependent on the number and thickness of individual layers. A non-catastropic fracture was observed in the laminated composites due to the deflection of cracks along the Ti/Al3Ti interface. The Ti layer failed by cleavage mode, showing extensive plastic deformation during the bending process. (c) 2005 Elsevier B.V. All rights reserved.