Fabrication of textured Ti2AlC lamellar composites with improved mechanical properties
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第3期
论文作者：Xi Xie Rui Yang Yuyou Cui Qing Jia Chunguang Bai
文章页码：86 - 92
摘 要：Textured Ti2AlC lamellar composites have been successfully fabricated by a new method in the present work. The composites exhibit high compressive strength of ca 2 GPa, fracture toughness of 8.5 MPa m1/2（//c-axis）, flexural strength of 735 MPa（//c-axis） and high hardness of 7.9 GPa（//c-axis）. The strengthening mechanisms were discussed. The sintering and densification process was investigated and crystal orientation and microstructure were studied by electron backscattered diffraction techniques. The synthesis temperature is reduced to 1200?C by using high surface-to-volume ratio Ti2AlC nano flakes. The Lotgering orientation factor of Ti2 AlC and Ti3 AlC2{00 l} planes in the textured top surface reaches 0.74 and 0.49, respectively. This new route may shed light on resolving the difficulties encountered in large scale fabrication of textured MAX phases.
Xi Xie1,2，Rui Yang1,2，Yuyou Cui1,2，Qing Jia1,2，Chunguang Bai1,2
1. School of Materials Science and Engineering, University of Science and Technology of China2. Institute of Metal Research, Chinese Academy of Sciences
摘 要：Textured Ti2AlC lamellar composites have been successfully fabricated by a new method in the present work. The composites exhibit high compressive strength of ca 2 GPa, fracture toughness of 8.5 MPa m1/2（//c-axis）, flexural strength of 735 MPa（//c-axis） and high hardness of 7.9 GPa（//c-axis）. The strengthening mechanisms were discussed. The sintering and densification process was investigated and crystal orientation and microstructure were studied by electron backscattered diffraction techniques. The synthesis temperature is reduced to 1200?C by using high surface-to-volume ratio Ti2AlC nano flakes. The Lotgering orientation factor of Ti2 AlC and Ti3 AlC2{00 l} planes in the textured top surface reaches 0.74 and 0.49, respectively. This new route may shed light on resolving the difficulties encountered in large scale fabrication of textured MAX phases.
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