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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(英文),2019,48(4):1155~1160.[Gao Wenlin,Ban Chunyan,Cui Jianzhong,Wang Xiangjie and Lu Zheng.Influences of Deep Cryogenic Treatment on Precipitated Phase of 7A99Aluminium Alloy[J].Rare Metal Materials and Engineering,2019,48(4):1155~1160.]
Influences of Deep Cryogenic Treatment on Precipitated Phase of 7A99Aluminium Alloy
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Received:September 09, 2017  Revised:November 25, 2017
DOI:
Key words: deep cryogenic treatment  7A99 aluminium alloy  TEM  3DAP  precipitated phase
Foundation item:国家重点研发计划:2016YFB0300901,国家自然科学基金:U1608252、51574075
Author NameAffiliation
Gao Wenlin,Ban Chunyan,Cui Jianzhong,Wang Xiangjie and Lu Zheng  
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Abstract:
      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.