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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Fabrication, microstructure characterization and fracture behavior of a unique micro-laminated TiB-TiAl composites
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Fabrication, microstructure characterization and fracture behavior of a unique micro-laminated TiB-TiAl composites

机译：独特微层压胫骨复合材料的制造，微观结构表征及断裂行为

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摘要

A feasible manufacturing & forming integration technology for production of TiB-TiAl composite sheets was successfully explored by employing reaction annealing of sandwich-structured (TiB/Ti)-Al laminates. Phase transformation, microstructure evolution of (TiB/Ti)-Al laminates during different reaction annealing processes were systematically investigated by means of optical microscope, scanning electron microscopy, transmission electron microscope and X-ray diffraction. The results showed that the resulting TiB-TiAl composites displayed a unique micro-laminated structure, composing of alternating fully lamellar (alpha(2)-Ti3Al/gamma-TiAl) layers, equiaxed gamma-TiAl layers and TiB-rich layers. Actually, TiB whiskers exhibited a layered distribution in fully lamellar alpha(2)/gamma layers, which was in favor of alpha(2)/gamma lamellae refinement. Moreover, formation mechanism of the micro-laminated structure was illustrated. It is noteworthy that the micro-laminated TiB-TiAl composites showed a significant increase in ductility while maintaining or even improving high-temperature tensile strength, in comparison with monolithic TiAl. In addition, fracture behavior of the novel TiB-TiAl composites was characterized by three-dimensional X-ray microscope (3D-XRM) and finally strengthening-toughening mechanism were clarified. (C) 2018 Elsevier B.V. All rights reserved.
机译：通过采用夹层结构（Tib / Ti）-al层压板的反应退火，成功探索了用于生产Tib-Tial复合板的可行制造和形成集成技术。通过光学显微镜，扫描电子显微镜，透射电子显微镜和X射线衍射，系统地研究了在不同反应退火过程中（Tib / Ti）-al层压材料的微观结构演化。结果表明，所得的Tib-Tial复合材料显示出独特的微层压结构，组合交替的全层层（α（2）-Ti3Al /γ-Tial）层，等轴γ-Tial层和富有的层。实际上，TIB晶须在完全层层α（2）/γ层中表现出分层分布，其有利于α（2）/γ薄片细化。而且，示出了微层压结构的形成机理。值得注意的是，与单片TiAl相比，微层叠的胫骨复合材料显示出延展性的显着增加，同时保持甚至改善高温拉伸强度。另外，通过三维X射线显微镜（3D-XRM）表征了新型Tib-TiAl复合材料的断裂行为，最后澄清了强化 - 增韧机制。 （c）2018年elestvier b.v.保留所有权利。

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