快速凝固Al-Cu-Mg-Fe-Ni合金的微观组织和力学性能  

Microstructure and Mechanical Properties of Rapidly Solidified Al-Cu-Mg-Fe-Ni Alloy

作　　者：张红[1] 高瑞平[1] 

机构地区：[1]合肥学院机械系,安徽合肥230022

出　　处：《热加工工艺》2005年第5期11-13,共3页Hot Working Technology

基　　金：安徽省教育厅自然科学基金资助项目 (2002kj245)

摘　　要：利用X射线衍射、差示扫描量热(DSC)、透射电镜(TEM)研究了快速凝固Al 4Cu Mg 3Fe 4Ni (质量分数,% )合金急冷态和退火态的微观组织,同时测定了该合金的显微硬度。结果表明:快凝合金急冷态组织为过饱和αAl基固溶体和Al3Ni相;当快凝合金经40 0℃Xw 1h处理后,有少量S相(CuMgAl2 )析出;经40 0℃Xw 9h处理后,出现了FeNiAl9弥散相;在合金组织中未见Al Cu Fe和Al Cu Ni相。随时效时间的增加,快凝合金的显微硬度不断增加,达到峰值后硬度缓慢下降,之后随FeNiAl9析出,硬度又重新增加。The microstructure of as spun and as annealed ribbons in rapidly solidified Al 4Cu Mg 3Fe 4Ni (mass fraction,%) alloy was investigated by using XRD,DSC,TEM and EDS. The microhardness of the alloy was also measured by means of Vickers hardness meter. The results show that the microstructure of the as spun alloy is in supersaturated solid solution state and there is Al 3Ni phase. When annealing at 400℃ for 1 h , there is a few precipitates of S(CuMgAl 2) phase. Heat treatment at 400℃ for 9 h leads to the formation of FeNiAl9 phase. Al Cu Fe phase and Al Cu Ni phase are not found in microstructure of as spun and as annealed. The microhardness of the alloy rises with the increase of aging time and then the microhardness of the alloy decreases vary slowly after the peak of microhardness when the aging temperature is 400℃. Significant increase in microhardness is attributed to the precipitation of the FeNiAl9 phase.

关 键 词：Al—Cu—Mg—Fe—Ni合金 快速凝固 显微组织 显微硬度 

分 类 号：TG244[金属学及工艺—铸造]