高锌超高强铝合金的均匀化退火工艺  

Homogenization annealing process of high zinc and ultra-high strength aluminum alloy

作　　者：张孝雷[1] 夏涛[1] 陈子勇[1] 马腾飞[1] 徐万峰[1] 宫子琪[1] 聂祚仁[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《材料热处理学报》2014年第3期63-67,共5页Transactions of Materials and Heat Treatment

基　　金：北京市教委重点基金项目(21009011200903)

摘　　要：为了获得高锌超高强铝合金均匀化退火适宜工艺,采用光学显微镜、差示扫描量热法、扫描电镜、能谱分析等方法研究二极均匀化退火工艺对高锌Al-Zn-Mg-Cu合金的组织和T6(120℃×24 h)人工时效后的力学性能的影响。结果表明,合金经400℃,4 h均匀化后的过烧温度为471℃;实验合金的最佳二级均匀化退火工艺为随炉升温到400℃保温4 h,再随炉升温到467℃保温30 h;合金经该均匀化工艺处理后,铸锭中的元素偏析明显消除,共晶相明显减少,合金挤压态析出相较小且分布均匀,合金力学性能明显改善。In order to obtain suitable homogeneous annealing process for high zinc and uhra-high strength aluminum alloy, the effects of two-step homogenization annealing process on microstructure and mechanical properties were studied by optical microscopy （OM）, differential scanning calorimetry （ DSC）, scanning electron microscopy （ SEM ） and energy dispersive spectroscopy （EDS）. The results show that the overheating temperature of the alloy homogenized at 400 ℃ for 4 b is 471 ℃ ; the best two-step homogenization process of the alloy after T6 artificial aging（ 120 ℃ for 24 h）is firstly heated at 400 ℃ for 4 h, and then heated at 467 ℃ for 30 h. After annealing by the two-step homogenizing process, element segregation in the ingot alloy is obviously eliminated, and eutectic phase decreases significantly, and precipitated phase of as-extruded alloy is relatively small and distributed evenly, the mechanical properties of the alloy can be improved significantly.

关 键 词：Al—Zn—Mg-Cu合金 均匀化工艺 微观组织 性能 

分 类 号：TG166.3[金属学及工艺—热处理]