Microstructure and mechanical properties of Ti_(3)(Al,Ga)C_(2)/Al_(2)O_(3) composites prepared by in situ reactive hot pressing

作     者：Yuan FANG Xiaohua LIU Yuxia FENG Jianfeng ZHU Wei JIANG 

作者机构：School of Material Science and EngineeringShaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021China 

出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)

年 卷 期：2020年第9卷第6期

页      面：782-790页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 0817[工学-化学工程与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：financially supported by the National Natural Science Foundation of China(51705300) the China Postdoctoral Science Foundation(2018M643559) the Natural Science Foundation of Shaanxi Province(2019JQ-775) Natural Science Foundation of Shaanxi Provincial Department of Education(19JK0152) the Scientific Research Fund of Shaanxi University of Science&Technology(2017BJ-05). 

主　　题：Ti_(3)AlC_(2) solid solution ceramic composites microstructure mechanical properties 

摘      要：In this study,Ti_(3)(Al,Ga)C_(2)/Al_(2)O_(3) composites were successfully synthesized by in situ hot pressing at 1350℃ for 2 h using Ti,Al,TiC,and Ga_(2)O_(3) as raw materials.X-ray diffraction and scanning electron microscopy were used for characterizing the phase identities and microstructures of the sintered composites.The dependence of the Vickers hardness and flexural strength on the Al_(2)O_(3) content was found to be in single-peak type.Ti_(3)(Al_(0.6),Ga_(0.4))C_(2)/10.3vol% Al_(2)O_(3) composite exhibited significantly improved mechanical properties.Vickers hardness and flexural strength of the composite reached 6.58 GPa and 527.11 MPa,which were 40% and 74% higher than those of Ti_(3)AlC_(2),respectively.Formation of solid solution and incorporation of second phase of Al_(2)O_(3) resulted in the opposite influence on the fracture toughness.Finally,the hardening and strengthening mechanisms were discussed in detail.