高文林,班春燕,崔建忠,王向杰,陆政.深冷处理对7A99铝合金峰值时效析出相的影响[J].稀有金属材料与工程,2019,48(4):1155~1160.[Gao Wenlin,Ban Chunyan,Cui Jianzhong,Wang Xiangjie,Lu Zheng.Influences of Deep Cryogenic Treatment on Precipitated Phase of 7A99Aluminium Alloy[J].Rare Metal Materials and Engineering,2019,48(4):1155~1160.]
深冷处理对7A99铝合金峰值时效析出相的影响
投稿时间:2017-09-09  修订日期:2017-11-25
中文关键词:  深冷处理  7A99铝合金  TEM  HRTEM  3DAP  析出相
基金项目:国家重点研发计划:2016YFB0300901,国家自然科学基金:U1608252、51574075
中文摘要:
      对7A99超高强铝合金反向挤压材采用T6峰值时效处理与冷热循环峰值时效热处理(简称T6-DCT),通过TEM、HRTEM与3DAP研究深冷处理对峰值时效析出相的种类、分布、尺寸以及析出密度的影响。结果表明,冷热循环峰值时效处理后晶粒内部析出相种类增多,由η"相变成η"相与η相共存;冷热循环峰值时效处理可以将析出相的平均等效半径由1.2 nm减小为1.0 nm,将析出相的密度由4.53×1024/m3提升至7.55×1024/m3,实现弥散强化;深冷处理可以降低 Zn、Mg元素的微观偏聚,提高析出相的分布均匀性。
Influences of Deep Cryogenic Treatment on Precipitated Phase of 7A99Aluminium Alloy
英文关键词:deep cryogenic treatment  7A99 aluminium alloy  TEM  3DAP  precipitated phase
英文摘要:
      Backward extrusion 7A99 ultrahigh-strength aluminium alloy was treated by T6 peak aging treatment and peak cold-heat cycle aging treatment (T6-DCT). TEM, HRTEM and 3DAP were employed to study the influences of T6-DCT treatment on the types, distribution, size and density of the precipitated phases. The result shows that the types of the precipitated phases increase, that η" phase turn to η" phase and η phase coexistence together. The avearge equivalent radius of the precipitated phases change from 1.2 nm to 1.0 nm after T6-DCT. The density of the precipitated phases increase from 4.53×1024/m3 to 7.55×1024/m3, which lead to dispersion-strengthening. After T6-DCT, the segretion of Zn and Mg decreases, and the precipitated phases distribute more homogeneous than that of T6 treatment.
作者单位E-mail
高文林 东北大学材料电磁过程研究教育部重点实验室 13241663121@163.com 
班春燕 东北大学材料电磁过程研究教育部重点实验室  
崔建忠 东北大学材料电磁过程研究教育部重点实验室  
王向杰 东北大学材料电磁过程研究教育部重点实验室  
陆政 北京航空材料研究院  
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