烧结气氛与温度对AlCuMgSi合金性能的影响  

Effects of sintering atmosphere and temperature on performance of P/M Al-Cu-Mg-Si alloy

作　　者：党文龙[1] 汪礼敏[1,2] 杨振亮[1,3] 王林山[1,3] 王立根[1] 梁雪冰[1,3] 

机构地区：[1]北京有色金属研究总院,北京100088 [2]有研粉末新材料(北京)有限公司,北京101407 [3]北京恒源天桥粉末冶金有限公司,北京101407

出　　处：《粉末冶金材料科学与工程》2014年第6期921-927,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：科技部国际合作交流项目(2011DFA51840);国家高技术研究发展计划(863计划)资助项(2013AAO31101);工信部"高档数控机床与基础制造装备"科技重大专项课题(2012ZX04009011)

摘　　要：采用Al-3.8Cu-1.0Mg-0.75Si铝合金粉末,分别在高纯氮气、高纯氩气、高纯氢气和分解氨等4种气氛下烧结,对比研究不同烧结气氛下制备的合金致密度、力学性能、尺寸变化和显微组织等性能。同时研究高纯氮气气氛下烧结温度对合金性能的影响。结果表明,在590℃烧结温度条件下,高纯氮气气氛中烧结的合金性能最佳,密度达2.66 g/cm3、致密度为97.1%,硬度为23 HRB,抗拉强度为205 MPa,尺寸收缩率为1.65%;高纯氢气中烧结的合金密度、硬度及强度都最低,抗拉强度为96 MPa,屈服强度只有74 MPa,合金组织中存在大量孔隙。随烧结温度升高,烧结坯中的液相逐渐增多,使合金烧结密度增大,强度提高,在590℃烧结的合金抗拉强度最高,为205 MPa;610℃烧结时产生过烧现象,元素偏析严重,合金性能下降。Using Al-3.8Cu-1.0Mg-0.75Si alloy powders as raw material, Al-3.8Cu-1.0Mg-0.75Si alloys were prepared by sintering with four different types of sintering atmospheres respectively including high purity nitrogen, high purity argon, high purity hydrogen and decomposition of ammonia. The densities, mechanical properties, dimensional changes and microstructures of the sintered samples were compared to explore the optimum of sintering atmosphere. Furthermore, the effect of sintering temperature on the properties of samples sintered under high-purity nitrogen atmosphere was also investigated. The results show that the high purity nitrogen is the most efficacious sintering atmosphere, under which the alloy with a high density of 2.66 g/cm3, hardness of HRB 23, high tensile strength of 205 MPa and the contraction rate of 1.65% can be obtained. The alloy sintered in high purity hydrogen has the minimum density, hardness and strength, its tensile strength is 96MPa, yield strength is 74 MPa, and a large number of pores exist in the microstructure. With increasing sintering temperature, the liquid phase increases, which results in the density and tensile strength increase, the maximum tensile strength of 205 MPa is obtained at 590℃ sintering. Over sintering appears at 610℃, the alloy has severe element segregation and low properties.

关 键 词：粉末冶金 铝合金 气氛 温度 力学性能 

分 类 号：TF124[冶金工程—粉末冶金]