不同含量原位自生TiB_(2)颗粒增强ZL114A铝基复合材料的组织与性能  

Microstructure and Properties of ZL114A Aluminum Matrix Composites Reinforced by Different Content In-situ TiB_(2) Particles

作　　者：李帅奇 高增[1] 刘闪光 金西伟 张震 牛济泰[1] LI Shuaiqi;GAO Zeng;LIU Shanguang;JIN Xiwei;ZHANG Zhen;NIU Jitai(School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications, Beijing 100095, China)

机构地区：[1]河南理工大学材料科学与工程学院,焦作454000 [2]中国航发北京航空材料研究院,北京100095 [3]北京市先进合金材料及应用工程技术研究中心,北京100095

出　　处：《机械工程材料》2024年第12期58-64,共7页Materials For Mechanical Engineering

基　　金：河南省科技攻关项目(232102230136);河南省高校基本科研业务费专项资金资助项目(NSFRF230605);先进焊接与连接国家重点实验室资助项目(AWJ-23M06)。

摘　　要：以ZL114A合金为基体,采用混合盐反应法制备不同质量分数(3%,6%,9%)原位自生TiB_(2)颗粒增强ZL114A铝基复合材料,研究了复合材料的组织和拉伸性能,并分析TiB_(2)在基体中的生长机制。结果表明:复合材料的主要物相均为铝相、硅相和TiB_(2)相,说明成功制备了原位自生TiB_(2)颗粒增强ZL114A铝基复合材料;随着TiB_(2)含量的增加,基体晶粒细化且出现球化,共晶硅明显细化且其形貌由粗大长条状变为短棒状;原位生成的TiB_(2)颗粒使得复合材料的强度和塑性均得到提高,断裂形式由ZL114合金的脆性断裂转变为韧脆混合断裂;随着TiB_(2)含量的增加,抗拉强度和断后伸长率均先升高后降低,当TiB_(2)质量分数为6%时达到最大,分别为237.4 MPa,6.7%;在制备复合材料过程中基体中先析出TiB_(2)近球形核心,随着球形核心的长大,其表面形成小平面,最终形成六棱台组合体的典型TiB_(2)形貌。With ZL114A alloy as matrix,ZL114A aluminum matrix composites reinforced by in-situ TiB_(2) particles with different mass fractions(3%,6%,9%)were prepared by mixed salt reaction method.The microstructure and tensile properties of composites were studied,and the growth mechanism of TiB_(2) in the matrix was analyzed.The results show that the main phases of the composites were Al,Si and TiB_(2) phases,indicating that the in-situ TiB_(2) particle reinforced ZL114A aluminum matrix composites were successfully prepared.With the increase of TiB_(2) content,the grains of the matrix were refined and spheroidized,the eutectic silicon was obviously refined and its morphology changed from coarse long strip to short rod.The in-situ TiB_(2) particles increased the strength and plasticity of the composite,and the fracture mode changed from brittle fracture of ZL114A alloy to mixed ductile-brittle fracture.With the increase of TiB_(2) content,the tensile strength and percentage elongation after fracture first increased and then decreased,and reached the maximum when the mass fraction of TiB_(2) was 6%,which were 237.4 MPa and 6.7%,respectively.During the preparation process of the composites,a nearly spherical TiB_(2) core was first precipitated from the matrix.With the growth of the spherical core,a small plane was formed on the surface of the spherical core,and finally the typical TiB_(2)morphology of the hexagonal platform combination was formed.

关 键 词：原位自生TiB_(2)颗粒 铝基复合材料 拉伸性能 显微组织 生长机制 

分 类 号：TB333[一般工业技术—材料科学与工程]