丁宇升,高坤元,郭姗姗,黄晖,文胜平,吴晓蓝,聂祚仁.均匀化退火对Al-6Mg-0.4Mn-0.15Zr-0.04Sc合金时效行为和微观结构影响[J].稀有金属材料与工程,2020,49(5):1803~1809.[Ding Yusheng,Gao Kunyuan,Guo shanshan,Huang Hui,Wen Shengping,Wu Xiaolan,Nie Zuoren.The Effect of Homogenization Treatment on Aging Behavior and Microstructure in Al-6Mg-0.4Mn-0.15Zr-0.04Sc Alloy[J].Rare Metal Materials and Engineering,2020,49(5):1803~1809.]
均匀化退火对Al-6Mg-0.4Mn-0.15Zr-0.04Sc合金时效行为和微观结构影响
投稿时间:2019-04-02  修订日期:2019-05-05
中文关键词:  Al-Mg合金  Sc, Zr微合金化  时效  均匀化
基金项目:国家科技部重点研发项目(2016YFB0300801),国家自然科学基金(51621003,51671005)和北京市自然科学基金资助项目(2162006)
中文摘要:
      本文采用显微硬度法,光学显微镜,扫描电镜和透射电镜探究了均匀化退火对Al-6Mg-0.4Mn-0.15Zr-0.04Sc合金Al3(Sc,Zr)相时效行为和Mg均匀性的影响。显微硬度结果显示,合金直接在Al-Mg合金的均匀化温度475℃单级退火时,峰值硬度为83HV,远低于等时退火时的峰值硬度92HV,表明单级均匀化退火时Al3(Sc,Zr)时效强化效果没有充分发挥。因此设计双级均匀化退火,第一级退火在275-350℃进行,使得Al3Sc相弥散析出,300℃具有最高的硬度峰值87HV,之后进行475℃第二级退火,使得Zr包裹在Al3Sc相长大,硬度进一步上升至92HV。微观结构分析显示双级退火相比于单级退火球形Al3(Sc,Zr)相更为细小弥散,因此具有更高的强化效果。合金经过300℃/7h+475℃/15h双级退火后,不仅枝晶处Mg的偏析完全消除,而且Al3(Sc,Zr)相可以细小弥散析出,从获得了更高强度和再结晶温度。
The Effect of Homogenization Treatment on Aging Behavior and Microstructure in Al-6Mg-0.4Mn-0.15Zr-0.04Sc Alloy
英文关键词:Al-Mg alloys  Microalloying element of Sc and Zr  aging behavior  homogenization
英文摘要:
      The effect of homogenization treatment on aging behavior of Al3(Sc,Zr) and homogeneity of Mg were studied in an Al-6Mg-0.4Mn-0.15Zr-0.04Sc alloy using Micro-hardness test, optical microscope, scanning electron microscope and transmission electron microscope. The peak hardness of alloy annealing at the normal homogeneous temperature of 475℃ was 83HV, much lower than those isochronally annealed at 175-550℃, demonstrated that the alloy did not obtained the sufficient aging strengthening from Al3(Sc,Zr) particle during one-stage annealing at 475℃. Therefore, two-stage homogeneous treatment was designed. The first stage annealing was selected from 275-350℃, where the 300℃ exhibited the highest peak hardness of 87HV, and the second-stage annealing were performed at 475℃ with the peak hardness of 92HV. The microstructure analyses indicated the Al3(Sc,Zr) particles in two-stage annealing were much finer than that of one step annealing. After annealing at 300℃/7h+475℃/15h, the segregation of Mg disappeared and the Al3(Sc,Zr) particles formed dispersedly at the same time.
作者单位E-mail
丁宇升 材料科学与工程学院 dingyusheng@emails.bjut.edu.cn 
高坤元 材料科学与工程学院 gaokunyuan@bjut.edu.cn 
郭姗姗 材料科学与工程学院  
黄晖 材料科学与工程学院  
文胜平 材料科学与工程学院  
吴晓蓝 材料科学与工程学院  
聂祚仁 材料科学与工程学院  
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