Volume 30 Issue 5
Aug.  2012
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LIU Xiao-yan, PAN Qing-lin, CAO Su-fang, LU Zhi-lun, HE Yun-bin, LI Wen-bin. Effects of External Stress During Aging on Microstructure and Properties of Al-Cu-Mg-Ag Alloy[J]. Journal of Aeronautical Materials, 2010, 30(5): 8-13.
Citation: LIU Xiao-yan, PAN Qing-lin, CAO Su-fang, LU Zhi-lun, HE Yun-bin, LI Wen-bin. Effects of External Stress During Aging on Microstructure and Properties of Al-Cu-Mg-Ag Alloy[J]. Journal of Aeronautical Materials, 2010, 30(5): 8-13.

Effects of External Stress During Aging on Microstructure and Properties of Al-Cu-Mg-Ag Alloy

  • Received Date: 2009-10-24
  • Rev Recd Date: 2010-07-21
  • Publish Date: 2010-10-01
  • The effects of external stress during aging on the microstructure and properties of Al-Cu-Mg-Ag alloy were studied by hardness test,optical microscopy(OM) and transmission electron microscopy(TEM).The results show that completely recrystallization occurs in the alloys aged with and without stress.The morphology of the alloy is not changed when treated by stress-aged but the precipitations are changed greatly.Both θ' phases and Ω phases precipitate to some preferred orientation,showing character of stress-orientation.The precipitation of θ' phases is accelerated while that of Ω phases is restrained,and the hardness of the alloy is decreased to a small extent.This might be due to that the large amounts of dislocations during stress-aging provide sites facilitating heterogeneous nucleation of θ' phases.Thereby,Ω precipitations with the same chemical constituents of θ' phases are retained.This is verified by the phenomenon that the density of θ'phases is increased while that of Ω phases is decreased,and the hardness is reduced when Al-Cu-Mg-Ag alloy is pre-deformed 6% before aged.During the stress-aging,the existence of the dislocations disrupts the diffusion of the solution atoms,correspondingly distance the formation of the clusters and the co-clusters.As a result,the precipitations of the strength phases are delayed.

     

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