Microstructure and mechanical properties of in situ synthesized Ti₂AlC/Al₂O₃ composites

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• 作者：Jianfeng Zhu ; Lan Ye ; ^{lanye0508@163.com} ; Liuhua He
• 关键词：Ti2AlC ; Al2O3 ; Composite ; Microstructure ; Mechanical properties
• 刊名：Materials Science and Engineering ; A
• 出版年：2012
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：15 June, 2012
• 卷：547
• 期：Complete
• 页码：6-11
• 文件大小：1130 K

摘要

Al₂O₃ particle-reinforced Ti₂AlC composites are successfully synthesized from the powder mixture of Ti, TiC, Al and TiO₂ by in situ hot-pressing method. The effect of Al₂O₃ addition on the microstructure and mechanical properties of the Ti₂AlC/Al₂O₃ composites is investigated in detail. It is found that the as-sintered products are mainly composed of Ti₂AlC matrix and Al₂O₃ reinforcement, and the in situ formed fine Al₂O₃ particles tend to disperse on the matrix grain boundaries. With increasing the Al₂O₃ content, the Rockwell hardness, compressive and flexural strength of Ti₂AlC/Al₂O₃ composites gradually increase. But the fracture toughness of the composites increases first then decreases with the increase in the Al₂O₃ and the Ti₂AlC/12 wt%Al₂O₃ sample possesses the maximum value of 5.37 MPa m^1/2, which is improved by 19.3%.