高文林,陈军洲,孙刚,黄粒,陆政.Mn元素在7A99铝合金中微观组态分布的研究[J].稀有金属材料与工程,2021,50(3):876~880.[gaowenlin,chenjunzhou,sungang,huangli,luzheng.Study on Microscopic Configuration Distribution of Mn Element in 7A99 Aluminium Alloy[J].Rare Metal Materials and Engineering,2021,50(3):876~880.]
Mn元素在7A99铝合金中微观组态分布的研究
投稿时间:2020-02-15  修订日期:2020-04-05
中文关键词:  Mn元素  7A99铝合金  TEM  HRTEM  3DAP  微观组态分布
基金项目:
中文摘要:
      通过半连续铸造方式向7A99铝合金中添加0.4%Mn元素,采用SEM、TEM、HRTEM与3DAP开展Mn元素在7A99铝合金铸锭、均匀化以及固溶时效过程中的微观组态分布的研究。研究结果表明,Mn元素在7A99铝合金铸锭中主要以晶界处鱼骨状的含AlZnMgCuMn的MgZn2型非平衡共晶化合物形式存在;均匀化处理后,Mn元素在7A99铝合金中主要以Al6Mn析出相与断续、细小、颗粒状的含AlZnMgCuMn的S型(Al2CuMg)第二相形式存在;固溶处理过程中,小部分Al6Mn析出相发生回溶,使得残留Al6Mn析出相尺寸范围处于0.2~1μm;120℃时效过程中,Mn元素始终主要以与尺寸稳定、与铝基体非共格的Al6Mn析出相形式存在;Mn元素在120℃时效过程中未析出新相,且未参与影响7A99铝合金中Zn、Mg元素的时效析出行为。
Study on Microscopic Configuration Distribution of Mn Element in 7A99 Aluminium Alloy
英文关键词:Mn element  7A99 aluminium alloy  TEM  HRTEM  3DAP  microscopic configuration distribution
英文摘要:
      0.4%Mn element was added into 7A99 alloy by semi-continuous casting in the study. TEM, HRTEM and 3DAP were employed to study the microscopic configuration distribution of Mn element in the cast, homogenization and solution aging of 7A99 alloy. The result shows that Mn element in 7A99 aluminum alloy ingot mainly exists in the form of fishbone shape MgZn2non-equilibrium eutectic compound containing AlZnMgCuMn at grain boundary. After homogenization treatment, Mn element in 7A99 alloy mainly exists in the form of Al6Mn phase and intermittent, fine, granular S(Al2CuMg) second phase containing AlZnMgCuMn at grain boundary. A small part of Al6Mn precipitated phase is dissolved back to the matrix, so that the size range of residual Al6Mn precipitated phase is 0.2~1μm in the process of solid solution treatment. Mn element always exists in the form of Al6Mn precipitated phase which is stable in size and non-coherent with aluminum matrix in the aging process of 120℃. Mn element does not precipitate other new phase during the aging proceed and affect the aging precipitation process of Zn, Mg in 7A99 alloy.
作者单位E-mail
高文林 北京航空材料研究院 13241663121@163.com 
陈军洲 北京航空材料研究院  
孙刚 北京航空材料研究院  
黄粒 北京航空材料研究院  
陆政 北京航空材料研究院  
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