TiC增强FeMnCu中熵合金基复合材料的制备及其力学性能  

Preparation and Mechanical Properties of FeMnCu Medium Entropy Alloy Matrix Composites Reinforced with TiC Particles

作　　者：李嘉雯 刘思聪 黄思睿 朱和国[1] Li Jiawen;Liu Sicong;Huang Sirui;Zhu Heguo(College of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学材料科学与工程学院,江苏南京210094

出　　处：《稀有金属材料与工程》2023年第4期1169-1175,共7页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51571118)。

摘　　要：采用真空感应熔炼法制备xTiC/FeMnCu(x=2.5,5,7.5,10,vol%)复合材料,并对其进行退火热处理。采用X射线衍射仪(XRD)、扫描电镜(SEM)、万能试验机等对所制备合金试样的晶体结构、成分、形貌、力学性能等进行分析。结果表明,xTiC/FeMnCu复合材料呈现出双相面心立方(fcc)结构。随着TiC含量的增加,复合材料的基体组织得到明显细化,抗拉强度逐渐增大,这可能是细晶强化、热错配强化、Orowan强化共同作用的结果。10TiC/FeMnCu经600℃/4h、800℃/4h退火后,结构没有明显变化,基体中有碳化物析出,试样的抗拉强度小幅提升但延伸率略有降低。xTiC/FeMnCu(x=2.5,5,7.5,10,vol%)composites were fabricated by vacuum induction melting and then annealed.X-ray diffraction(XRD),scanning electron microscope(SEM)and energy dispersive spectrum(EDS)were used to analyze the phase constitution and microstructure,and the tensile properties of the samples were investigated by the universal tensile testing machine.The results show that the xTiC/FeMnCu(x=2.5,5,7.5,10,vol%)composites exhibit a biphasic face-centred cubic structure.With the increase in x value,the matrix structure of the composites is significantly refined and the tensile strength gradually increases,which is due to the combined effect of fine grain strengthening,thermal mismatch strengthening and Orowan strengthening.After 10TiC/FeMnCu is annealed at 600°C for 4 h and 800°C for 4 h,the structure does not change significantly,and carbides are precipitated in the matrix.The tensile strength of the sample increases but the elongation decreases slightly.

关 键 词：中熵合金 真空感应熔炼 TiC增强 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]