Zhao Qian, Liang Yunhong, Zhang Zhihui, Li Xiujuan, Ren Luquan
The Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130025, China.
The Key Laboratory of Bionic Engineering, Ministry of Education, Jilin University, Changchun 130025, China; School of Mechanical, Aerospace and Civil Engineering, University of Manchester, Manchester, M139PL, United Kingdom.
Micron. 2016 Dec;91:11-21. doi: 10.1016/j.micron.2016.09.004. Epub 2016 Sep 13.
Reaction behavior, mechanical property and impact resistance of TiC-TiB/Al composite reacted from Al-Ti-BC system with various Al content via combination method of combustion synthesis and hot pressed sintering under air was investigated. Al content was the key point to the variation of mechanical property and impact resistance. Increasing Al content could increase the density, strength and toughness of the composite. Due to exorbitant ceramic content, 10wt.% and 20wt.% Al-Ti-BC composites exhibited poor molding ability and machinability. Flexural strength, fracture toughness, compressive strength and impact toughness of 30-50wt.% Al-Ti-BC composite were higher than those of Al matrix. The intergranular fracture dispersed and defused impact load and restricted crack extension, enhancing the impact resistance of the composite. The composite with 50wt.% Al content owned highest mechanical properties and impact resistance. The results were useful for the application of TiC-TiB/Al composite in impact resistance field of ceramic reinforced Al matrix composite.
研究了通过燃烧合成与热压烧结相结合的方法，在空气中由具有不同Al含量的Al-Ti-BC体系反应制备的TiC-TiB/Al复合材料的反应行为、力学性能和抗冲击性。Al含量是力学性能和抗冲击性变化的关键因素。增加Al含量可提高复合材料的密度、强度和韧性。由于陶瓷含量过高，10wt.%和20wt.%的Al-Ti-BC复合材料表现出较差的成型能力和加工性能。30-50wt.%的Al-Ti-BC复合材料的弯曲强度、断裂韧性、抗压强度和冲击韧性均高于Al基体。沿晶断裂分散并消散了冲击载荷，限制了裂纹扩展，提高了复合材料的抗冲击性。Al含量为50wt.%的复合材料具有最高的力学性能和抗冲击性。这些结果对于TiC-TiB/Al复合材料在陶瓷增强Al基复合材料抗冲击领域的应用具有参考价值。
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