Superior tensile strength and microstructure evolution of TiB whisker reinforced Ti60 composites with network architecture after β extrusion
Superior tensile strength and microstructure evolution of TiB whisker reinforced Ti60 composites with network architecture after β extrusion
复制标题
β 挤压后具有网络结构的 TiB 晶须增强 Ti60 复合材料的优异拉伸强度和微观结构演变
DOI：
10.1016/j.matchar.2015.03.029
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发表时间：
2015-05-01
影响因子：
4.7
通讯作者：
Geng, L.
中科院分区：
文献类型：
--
作者：
Wang, B.;Huang, L. J.;Geng, L.
The tensile properties (at room and high temperatures) and microstructure evolution after extrusion (1200 degrees C) have been systematically investigated in TiBw/Ti60 composites with network architecture. The microstructure of matrix of composites shows that grain size was significantly refined and sufficient substructure was introduced after beta extrusion. DRX occurred prior near TiBw region due to providing the nucleation site and having high driving force. Moreover, ordered alpha(2) phase which is formed in sintering process was re-dissolved after extrusion. The as-extruded composite exhibits strong < 0001 >(alpha)//ED fiber texture which is transformed from < 110 >(alpha)//ED fiber texture based on Burgers' relationship, which are beneficial to tensile properties of the composites. The highest tensile strength (1454 MPa) of the as-extruded 5.1 vol.% TiBw/Ti60 composites and the well combination of tensile strength (1364 MPa) and elongation (6%) of the as-extruded 3.4 vol.% TiBw/Ti60 composites have been obtained at room temperature. In particular, the as-extruded composites also exhibited super-high tensile strength at elevated temperatures (close to 1000 MPa at 600 degrees C and 800 MPa at 700 degrees C) compared with matrix alloy. Combining analysis of fracture surfaces and microstructure evolution, the better properties can be attributed to the alignment distribution of TiBw along the extrusion direction and the matrix strengthening effects including refinement of grain, the substructure and texture strengthening. (C) 2015 Elsevier Inc. All rights reserved.
