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.
作者
怯喜周
王宇慧
彭艳杰
杨子易
陈刚
许晓静
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)
出处
《铸造技术》
CAS
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)。
作者简介
怯喜周,1984年生,博士,副教授,硕士生导师.研究方向:高性能铝合金及其复合材料的设计制备与成形加工.Email:kaixizhou@ujs.edu.cn。
