原位纳米ZrB_(2)颗粒增强7085铝合金的微观组织与力学性能研究  

Research on the Microstructure and Mechanical Properties of 7085 Aluminum Alloy Reinforced by In-situ ZrB_(2) Nanoparticles

作　　者：怯喜周[1] 王宇慧 彭艳杰 杨子易 陈刚[1] 许晓静[2] KAI Xizhou;WANG Yuhui;PENG Yanjie;YANG Ziyi;CHEN Gang;XU Xiaojing(School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212000,China;Institute for Advanced Manufacturing and Modern Equipment Technology,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212000 [2]江苏大学先进制造与现代装备技术工程研究院,江苏镇江212013

出　　处：《铸造技术》2023年第6期568-575,共8页Foundry Technology

基　　金：国家自然科学基金(U20A20274,52071158,51701085)。

摘　　要：本文通过原位合成技术,成功制备了纳米ZrB_(2)颗粒增强7085铝合金基复合材料。采用金相显微镜、扫描电子显微镜、透射电子显微镜、X射线衍射仪进行表征,并进行力学性能测试,研究了ZrB_(2)纳米增强体对7085铝合金的显微组织和力学性能的影响。结果表明,ZrB_(2)纳米增强体可以显著提高7085铝合金的强度。但是随着增强体体积分数增大,ZrB_(2)颗粒团聚现象加剧,不利于复合材料的塑韧性提高。同时,在复合材料中引入微量稀土元素Sc可使纳米ZrB_(2)颗粒团聚现象得到改善,并进一步细化基体晶粒,使复合材料的强度和延长率都得到提高。当ZrB_(2)含量为2%(体积分数)、Sc含量为0.4%(质量分数)时,复合材料的抗拉强度为534 MPa、伸长率为10.2%,相较于7085铝合金基体分别提高了17.4%、14.6%。In this study,in-situ ZrB_(2) reinforced 7085 aluminum matrix composites were fabricated via an in-situ synthesis technique.The influence of ZrB_(2) nanoparticles on the microstructure and mechanical properties was investigated by optical microscope(OM),scanning electron microscopy(SEM),transmission electron microscope(TEM),X-ray diffractometer(XRD)and tensile testing.The results indicate that the strength could be markedly improved by ZrB_(2) nanoparticle reinforcement.However,agglomeration of ZrB_(2) nanoparticles is aggravated with the volume fraction of ZrB_(2) nanoparticles,which is harmful to improving the plasticity and toughness of the composite.Thus,to solve this problem,rare earth elements were introduced into composite materials.The results show that the agglomeration of ZrB_(2) particles is improved and the matrix grains are refined significantly.Moreover,the strength and elongation are enhanced.When the volume fraction of ZrB_(2) is 2%and mass fraction of Sc is 0.4%,the ultimate tensile strength and elongation of the composite are 534 MPa and 10.2%,respectively,which are approximately 17.4%and 14.6%higher than those of the 7085 aluminum alloy matrix.

关 键 词：原位纳米ZrB_(2)颗粒 7085铝合金 稀土Sc 力学性能 

分 类 号：TG113.25[金属学及工艺—物理冶金] TB331[金属学及工艺—金属学]