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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(英文),2020,49(5):1803~1809.[Ding Yusheng,Gao Kunyuan,Guo shanshan,Huang Hui,Wen Shengping,Wu Xiaolan and 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.]
The Effect of Homogenization Treatment on Aging Behavior and Microstructure in Al-6Mg-0.4Mn-0.15Zr-0.04Sc Alloy
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Received:April 02, 2019  Revised:May 05, 2019
DOI:
Key words: Al-Mg alloys  Microalloying element of Sc and Zr  aging behavior  homogenization
Foundation item: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)
Author NameAffiliation
Ding Yusheng,Gao Kunyuan,Guo shanshan,Huang Hui,Wen Shengping,Wu Xiaolan and Nie Zuoren  
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Abstract:
      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.