内生型TiC颗粒增强FeMnNiCo高熵合金基复合材料的微观组织与力学性能  

Microstructure and Mechanical Properties of In-situ TiC Particles Reinforced FeMnNiCo High Entropy Alloy Matrix Composites

作　　者：邓渊博 朱和国[1] Deng Yuanbo;Zhu Heguo(College of Materials Science and Engineering/Herbert Gleiter Institute,Nanjing University of Science and Technology,Jiangsu,210094)

机构地区：[1]南京理工大学材料科学与工程学院格莱特研究院,江苏210094

出　　处：《当代化工研究》2023年第9期35-38,共4页Modern Chemical Research

基　　金：江苏省科技进步项目“大型起重机械残余应力超声无损测试关联研究”(项目编号:BE2018753/KJ185629)。

摘　　要：通过真空感应熔炼制备了内生型TiC颗粒增强FeMnNiCo高熵合金基复合材料(HEACs)。研究了TiC含量对复合材料的微观组织和力学性能的影响。结果表明,TiC的形成并没有引起基体晶体结构的改变,仍保持FCC结构。随着TiC含量的提高,TiC颗粒的数量和尺寸增加,并且出现了颗粒团聚。在TiC颗粒的体积分数为5vol.%时,其极限拉伸强度和屈服强度分别为609.2MPa和349.1MPa,与基体相比分别增加了32%和46%;而断裂延伸率为45%,实现了高抗拉强度和良好塑性的统一。复合材料的强化机制为Orowan与固溶组合强化机制。In-situ TiC particles reinforced FeMnNiCo high-entropy alloy matrix composites(HEACs)were prepared by vacuum induction melting.The effect of TiC content on the microstructure and mechanical properties of the composites were studied.It was found that the formation of TiC did not incur phase transformation,and as such the high-entropy alloy matrix retained FCC structure.With the increase of TiC content,the number and size of TiC particles increased,and the particle agglomeration occurred in the composites.By introducing 5 vol.%of TiC in the composites,the ultimate tensile strength and yield strength are found to be 609.2 MPa and 349.1 MPa,respectively,which increase by 32%and 46%as compared with the matrix;while the fracture elongation is 45%.The unification of high tensile strength and good plasticity was achieved through the combination of Orowan mechanism and solid solution strengthening.

关 键 词：高熵合金基复合材料 微观组织 力学性能 强化机制 

分 类 号：TG[金属学及工艺]