稀土Y对TiB_(2)/Al-Zn-Mg-Cu-Zr微观组织与性能的影响  

Effect of Y on Microstructure and Properties of TiB_(2)/Al–Zn–Mg–Cu–Zr

作　　者：马志锋 刘行 黄景存 韩杨 王屿鑫 李萌[3] 陈子勇[3] MA Zhifeng;LIU Xing;HUANG Jingcun;HAN Yang;WANG Yuxin;LI Meng;CHEN Ziyong(Institute of Aluminum Alloy,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Materials and Manufacturing Department of Beijing University of Technology,Beijing 100124,China)

机构地区：[1]中国航发北京航空材料研究院铝合金研究所,北京100095 [2]中国航发北京航空材料研究院北京市先进铝合金材料及应用工程技术研究中心,北京100095 [3]北京工业大学材料与制造学部,北京100124

出　　处：《航空制造技术》2023年第23期94-99,共6页Aeronautical Manufacturing Technology

摘　　要：稀土Y对TiB2颗粒增强复合材料具有优异的细化效果,可改善TiB2颗粒团簇造成的性能损伤,对提高复合材料综合力学性能有重要作用。本文采用传统铸造及热挤压工艺制备3%(质量分数)TiB_(2)/Al–Zn–Mg–Cu–Zr–Y复合材料板材,通过扫描电子显微镜、透射电子显微镜、室温拉伸测试等表征手段研究了不同Y含量对TiB2增强铝基复合材料的显微组织与力学性能的影响。结果表明,Y元素的添加可以细化复合材料铸态组织,添加0.1%Y(质量分数)时,细化效果最好,T6态的综合性能最优,抗拉强度为729.85 MPa,延伸率高达8.06%。Y元素的加入使晶界处生成难溶相Al_(8)Cu_(4)Y(Zr),热挤压可使其破碎并起到一定强化效应,但过量的Al_(8)Cu_(4)Y(Zr)导致材料强度、塑性降低。TiB2颗粒增加了基体内位错密度,起到位错强化、载荷传递强化效应。GP II和η′是复合材料T6态中主要的纳米强化相。Rare earth Y has excellent refining effect on TiB2 particle reinforced composites,and can improve the performance damage caused by TiB2 particle clusters.It plays an important role in improving the comprehensive mechanical properties of composites.In this paper,3%(mass fraction)TiB_(2)/Al–Zn–Mg–Cu–Zr–Y composite plates were prepared by traditional casting and hot extrusion.The effects of Y content on the microstructure and mechanical properties of TiB2–reinforced aluminum matrix composites were investigated by scanning electron microscopy(SEM),transmission electron microscopy(TEM)and tensile test at room temperature.The results show that the as-cast microstructure of composites can be refined by addition of Y,and the refining effect is the best when 0.1%Y(mass fraction)is added.The composite with 0.1%Y(mass fraction)has the best mechanical properties,with the ultimate tensile strength(UTS)of 729.85 MPa and the elongation(EL)of 8.06%.The addition of Y element leads to the formation of insoluble phase Al_(8)Cu_(4)Y(Zr)at the grain boundary,which can be broken and strengthened by hot extrusion.Excessive Al8Cu4Y(Zr)leads to the decrease of strength and plasticity of the material.TiB2 particles can increase the dislocation density in the matrix,and have the effect of dislocation strengthening and load transfer strengthening.GP II andη′are the main nano-strengthening phases in the T6 state of the composites.

关 键 词：航空工业 铝合金 复合材料 微观组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TB33[金属学及工艺—金属材料]