均匀化处理对7B50铝合金的组织与性能的影响  

Effects of Homogenization Treatment on Microstructure and Properties of 7B50 Aluminum Alloy

作　　者：李国锋[1] 张新明[1] 朱航飞[1] 李鹏辉[1] 

机构地区：[1]中南大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2008年第5期344-347,共4页Special Casting & Nonferrous Alloys

基　　金：国家教育部博士点基金资助项目(2004053304);湖南省科技厅计划项目(06FJ3145)

摘　　要：采用金相观察、X射线衍射和电子显微分析技术研究了均匀化处理对7B50高强铝合金的组织与性能的影响。研究结果表明,二级均匀化较一级均匀化使试验合金残留的非平衡共晶数量减少,成分分布更均匀,残留的非平衡共晶相主要是含铁的难溶共晶化合物;基体中二级均匀化较一级均匀化析出的第二相Al3Zr粒子有所长大,但分布均匀、弥散,经二级均匀化处理的合金的强度有所提高。Effects of homogenization treatment on microstructure and properties of 7B50 aluminum alloy have been investigated by optical microscope(OM),XRD(X-ray diffraction) and SEM (scanning electron microscope). The results indicate that the content of residual un-equilibrium eutectic phase with more uniform distribution which is mainly composed of immiscible Fe-eutectic phase in the alloy homogenized by two-step homogenization treatment is much less than that homogenized by one-step homogenization treatment. Compared with that precipitated from the alloy homogenized by one-step homogenization treatment,the secondary phase Al3Zr particle precipitated from the alloy homogenized by two-step homogenization treatment exhibits more dispersive and uniform distribution with slight coarse,which is helpful to the improvement of strength of the alloy.

关 键 词：均匀化 7850铝合金 组织与性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113[金属学及工艺—金属材料]