原位合成TiC/5052复合材料的组织与力学性能  

Microstructure and Mechanical Properties of In-situ Synthesized TiC/5052 Composites

作　　者：姜思琪 范智勇 周泽华[1] 张欣[1] 王琦杰 JIANG Siqi;FAN Zhiyong;ZHOU Zehua;ZHANG Xin;WANG Qijie(College of Mechanics and Materials,Hohai University,Nanjing 211100,Jiangsu,China)

机构地区：[1]河海大学力学与材料学院

出　　处：《陶瓷学报》2019年第4期491-496,共6页Journal of Ceramics

基　　金：江苏省研究生科研与实践创新计划项目(KYCX18_0569);中央高校基本科研业务费(2018B689X14)

摘　　要：采用原位合成技术制备TiC/5052复合材料,研究TiC对复合材料微观组织和力学性能的影响。实验结果表明,适量原位TiC颗粒能有效提升5052铝合金强度,且保持良好塑性。原位TiC生成后,基体晶粒由树枝晶向等轴晶转变,弥散在晶界处,促进基体异质形核,有效抑制晶粒长大。随着原位TiC含量增加,复合材料抗拉强度先增加后降低,硬度逐渐增加,断后伸长率逐渐下降。当原位TiC含量为3wt.%时,复合材料抗拉强度达到峰值,为216.17 MPa,较基体提高约14%,此时硬度为HB49.4,断后伸长率为26.16%。The TiC/5052 matrix composites were fabricated by in-situ reaction.The effects of TiC on the microstructure and me chanical properties of the composites were discussed.The results indicated that an appropriate mass fraction of in-situ TiC par ticles could strengthen 5052 alloy effectively and maintain good plasticity.The matrix grains changed from dendrites to equiaxed crystals after in-situ reaction.In-situ TiC particles enriched at the grain boundary uniformly and promoted matrix's heterogeneous nucleation effectively.With the increase of in-situ TiC content,the ultimate tensile strength increased first and then decreased,the hardness increased,and the elongation to failure decreased.When the mass fraction of TiC particles was 3%,the ultimate tensile strength reached 216.17 MPa,while the hardness was HB 49.4 and the elongation to failure was 29.16%.

关 键 词：原位合成 晶粒细化 铝基复合材料 TiC陶瓷颗粒 

分 类 号：TQ174.75[化学工程—陶瓷工业]