Al-TiO_(2)-Gr复合材料冷镦过程中的致密化与变形研究  

Densification and deformation studies composite Al-TiO_(2)-Gr during cold upsetting

作　　者：吕刚磊[1,2] 朱永刚 张静[3] 张智辉 LÜGanglei;ZHU Yonggang;ZHANG Jing;ZHANG Zhihui(Zhengzhou Institute of Technology,School of Mechanical Engineering,Zhengzhou 450064,China;Henan Engineering Technology Research Center,Zhengzhou 450064,China;Luoyang quality measurement testing center,Light industry room,Luoyang 471003,China;Luoyang Railway Information Engineering School,Luoyang 471900,China)

机构地区：[1]郑州科技学院机械工程学院,河南郑州450064 [2]河南省工程技术研究中心,河南郑州450064 [3]河南省洛阳市质量计量检测中心轻工室,河南洛阳471003 [4]洛阳铁路信息工程学校,河南洛阳471900

出　　处：《粉末冶金工业》2022年第6期41-46,共6页Powder Metallurgy Industry

基　　金：河南省科技厅科技攻关项目(172102210536);河南省高等学校重点科研项目(21B460019);河南省高等学校青年骨干教师培养计划。

摘　　要：以球磨粉为原料,采用粉末冶金法制备了Al、Al-2.5%TiO_(2)、Al-2.5%TiO_(2)-2%Gr、Al-2.5%TiO_(2)-4%Gr等纯铝及其铝基复合材料。对烧结Al-TiO_(2)-Gr复合材料在冷镦过程中的致密化和变形性能进行了试验研究。在40 k N液压机上,采用适当的冲头和模具对粉末预制件进行压制,初始理论密度保持在85%。在590℃的电炉中空气气氛下烧结3 h。烧结件承受10 k N的增量压缩载荷进行冷镦,直到在自由表面发现裂纹为止。计算预制件的轴向应力(σz)、环向应力(σθ)、平均应力(σm)和有效应力(σeff),这些应力均与轴向应变(εz)有关。研究了复合材料在轴向应变(εz)和横向应变下的致密化行为。与其他复合材料预制件相比,纯铝预制件具有更好的致密化和变形性能。在纯Al和Gr增强体中加入TiO_(2)可以提高Al-TiO_(2)复合材料的强度。Using ball mill powder as raw material,Al,Al-2.5%TiO_(2),Al-2.5%TiO_(2)-2%Gr,Al-2.5%TiO_(2)-4%Gr and other pure aluminum and aluminum-based composite materials were prepared by powder metallurgy method.The densification and deformation properties of sintered Al-TiO_(2)-Gr composites during cold heading were investigated.The powder preforms were pressed with a 40 k N hydraulic press with appropriate punches and dies,keeping the initial theoretical density at 85%,and then sintered in an electric furnace at 590℃for 3 h in an air atmosphere.The sintered preforms were subjected to incremental compressive loads of 10 kN until cracks were found on the free surface.Axial stress(σz),hoop stress(σθ),mean stress(σm)and effective stress(σeff)were calculated for all pre‐forms,which are related to the axial strain(εz).The densification behavior of the composites under axial strain(εz)and transverse strain was investigated.Compared with other composite material preforms,pure aluminum preforms have better densification and deformation properties.Adding TiO_(2)to pure Al and Gr reinforcements can improve the strength of Al-TiO_(2)composites.

关 键 词：金属基复合材料 铝 冷镦 粉末冶金 致密化 

分 类 号：TF125[冶金工程—粉末冶金] TB333[冶金工程—冶金物理化学]