Synthesis and Fracture Characteristics of TiB2-TiAl Composites with a Unique Microlaminated Architecture
Synthesis and Fracture Characteristics of TiB2-TiAl Composites with a Unique Microlaminated Architecture
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具有独特微层压结构的 TiB2-TiAl 复合材料的合成和断裂特性
DOI：
10.1007/s11661-019-05475-8
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发表时间：
2019-12
影响因子：
2.8
通讯作者：
Sun Yuan
中科院分区：
文献类型：
--
作者：
Cui Xiping;Zhang Yuanyuan;Yao Yao;Ding Hao;Geng Lin;Huang Lujun;Sun Yuan
采用扫描电镜（SEM）和透射电镜（TEM）研究了轧制态（TiB 2/Al）-Ti层板在多步热处理过程中的组织演变及TiB 2-TiAl复合材料的组织特征。所制备的TiB 2-TiAl复合材料具有独特的微层状结构，由α2-Ti 3Al/γ-TiAl层和富TiB 2层交替组成。并对微层状结构的形成机理进行了分析。值得注意的是，由于TiB 2颗粒的强化作用和独特的微层状组织的结构效应，TiB 2-TiAl复合材料表现出更高的高温拉伸性能和室温断裂韧性。此外，结合三维X射线显微镜（3D-XRM）和扫描电镜（SEM）对TiB 2-TiAl微层压复合材料在动态拉伸过程中的断裂行为进行了表征。结果表明，气孔和裂纹优先在脆性富TiB 2层中萌生，并呈典型的层状分布，然后扩展到附近的一个全片层α2/γ层，并不断扩展穿过整个α2/γ层进入另一个富TiB 2层，反复进行，最后主裂纹扩展穿过所有全片层α2/γ层和富TiB 2层，最终导致失效。提出了TiB 2-TiAl微层压复合材料的断裂机理。
Microstructural evolution of as-rolled (TiB2/Al)-Ti laminates in the process of multistep heat treatments and microstructural characteristics of the resulting TiB2-TiAl composites were investigated in detail by scanning electron microscope (SEM) and transmission electron microscope. The desired TiB2-TiAl composites exhibited a unique microlaminated structure consisting of alternating fully lamellarα2-Ti3Al/γ-TiAl layers and TiB2-rich layers. Moreover, the formation mechanism of the microlaminated structure was elucidated. It is noteworthy that the TiB2-TiAl composites showed improved high-temperature tensile properties and room-temperature fracture toughness due to the strengthening effect of TiB2particles and the structure effect of the unique microlaminated microstructure. In addition, the fracture behavior of the microlaminated TiB2-TiAl composites during the dynamic tensile was characterized by combining use of the three-dimensional X-ray microscope (3D-XRM) and SEM. The results indicated that pores and cracks preferred to initiate in the brittle TiB2-rich layer and showed a typical layered distribution, and then expanded into a nearby fully lamellarα2/γlayer and kept propagating through the entireα2/γlayer into another TiB2-rich layer, repeatedly, and finally the main crack propagated through all the fully lamellarα2/γlayers and TiB2-rich layers, eventually resulting in failure. Thus, the fracture mechanism of the innovative microlaminated TiB2-TiAl composites was proposed.
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