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

Developing high toughness and strength Al/TiC composites using ice-templating and pressure infiltration
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利用冰模板和压力渗透开发高韧性和高强度的 Al/TiC 复合材料

DOI:
10.1016/j.ceramint.2016.12.038
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发表时间:
2017-03
影响因子:
5.2
通讯作者:
Jiang Qi-Chuan
Jiang Qi-Chuan
中科院分区:
材料科学1区
文献类型:
--
作者:
Wang Ya;Shen Ping;Guo Rui-Fen;Hu Zhi-Jie;Jiang Qi-Chuan

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我们使用冰模板和压力渗透制备了具有不同陶瓷体积分数(15、25 和 35 vol%)的 Al/TiC 复合材料。通过改变浆料浓度来控制 TiC 支架陶瓷层的层状层厚度和孔隙率。 Al/15 vol%TiC复合材料具有较厚的金属层和低密度陶瓷层,有效消散了裂纹尖端的应力,并以多重裂纹扩展模式断裂,弯曲强度为355±3 MPa,断裂韧性为81±2 MPa m1/2。然而,与 Al/15 vol%TiC 复合材料相比,Al/25 vol%TiC 和 Al/35 vol%TiC 复合材料具有更高的弯曲强度(417−500 MPa),但断裂韧性较低(46−33 MPa m1/2),并且以单裂纹扩展模式断裂。此外,随着断裂表面陶瓷体积的增加,脆性TiAl3相的增加大大降低了Al/TiC复合材料的韧性。最后,讨论了层状复合材料中的裂纹模式和结构特征之间的关系,以解释增韧机制。
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 TiAl3phase 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.
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