Developing high toughness and strength Al/TiC composites using ice-templating and pressure infiltration

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• 作者：Ya Wang^a ; ^b ; Ping Shen^a ; ^b ; ; Rui-Fen Guo^b ; Zhi-Jie Hu^b ; Qi-Chuan Jiang^a ; ^b
• 关键词：Ice-templating ; Metal&minus ; ceramic laminated composites ; Multiple crack propagation ; Toughness
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：43
• 期：4
• 页码：3831-3838
• 全文大小：2324 K
• 卷排序：43

文摘

We prepared Al/TiC composites with different ceramic volume fractions (15, 25 and 35 vol%) using ice-templating and pressure infiltration. The thickness of the lamellar layer and the porosity in the ceramic layer of the TiC scaffolds were controlled by varying the slurry concentration. The Al/15 vol%TiC composite had a thick metal layer and a low-density ceramic layer, which effectively dissipated the stress at the crack tip and fractured in a multiple-crack-propagation mode, giving bending strength of 355±3 MPa and fracture toughness of 81±2 MPa m1/2. However, the Al/25 vol%TiC and Al/35 vol%TiC composites had much higher bending strength (417−500 MPa) but lower fracture toughness (46−33 MPa m1/2) as compared to the Al/15 vol%TiC composite, and they fractured in a single-crack-propagation mode. In addition, an increase in the brittle TiAl3 phase with increasing ceramic volume at the fracture surface greatly deteriorated the toughness of the Al/TiC composites. Finally, the relationship between cracking mode and structure features in the laminated composites was discussed to account for the toughening mechanism.