Microstructure and Mechanical Property of Ti3AlC2/TiAl3 Composite Synthesized by Hot Pressing
Microstructure and Mechanical Property of Ti3AlC2/TiAl3 Composite Synthesized by Hot Pressing
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DOI：
10.4028/www.scientific.net/msf.816.210
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发表时间：
2015-04
期刊：
影响因子：
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通讯作者：
W. Chen;Yong Zeng;Xiao Li;Huaqiang Xiao
中科院分区：
文献类型：
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作者：
W. Chen;Yong Zeng;Xiao Li;Huaqiang Xiao
将Ti粉、Al粉和石墨粉在1200 °C、30 MPa、30 min条件下球磨原位反应热压制备了Ti 3AlC 2/TiAl 3复合材料。研究了20%volTi3AlC2/TiAl 3复合材料的力学性能和增韧机制。结果表明，在50 h的球磨过程中，没有发现新相的生成.原位合成的样品是完全致密的，由72%volTiAl3，24%volTi3AlC2和4%volAl2O3/TiC组成。复合材料的维氏硬度、三点弯曲强度和断裂韧性分别为~ 5.2GPa、~243 MPa和~ 4.3MPa/m1/2。显微组织分析表明，裂纹偏转、裂纹桥接和Ti 3AlC 2的分层是其主要增韧机制。
Ti3AlC2/TiAl3 composite was successfully fabricated by ball milling and in-situ reaction/hot-pressing of Ti, Al and graphite powders mixture at 1200 °C and 30 MPa for 30 min. The phase composition and microstructure of the milled powders and synthesized composite were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), the mechanical properties and the toughening mechanism of 20%vol Ti3AlC2/TiAl3 composite was also studied. The results show that no new phase is detected during 50 h of milling process. The in-situ synthesized samples are fully dense and composed of 72%vol TiAl3, 24%vol Ti3AlC2 and 4%vol Al2O3/TiC. The Vickers Hardness, three-point bending strength and fracture toughness of the composite is ~5.2 GPa, ~243 MPa and ~4.3 MPa/m1/2, respectively. Analysis of microstructure reveals that crack deflection, crack bridging and delamination of Ti3AlC2 are the main mechanism responsible for the toughening.