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Journal of Materials Science

, Volume 46, Issue 15, pp 5090–5096 | Cite as

Microstructural evolution during creep of a hot extruded 2D70Al-alloy

  • Guo-jun WangEmail author
  • Bai-qing Xiong
  • Yong-an Zhang
Article

Abstract

Microstructural evolution during creep of a hot extruded Al–Cu–Mg–Fe–Ni (2D70) Al-alloy was investigated in this study using transmission electron microscopy (TEM). The samples for creep test were carried out two-stage homogenization, followed by extruding. The creep ultimate strength dropped and the temperature increased gradually from 312 to 117 MPa and from 423 to 513 K, respectively. The microstructural observation for the crept samples showed that the S′ phase coarsened with increased creep temperature and the aging precipitates transformed from S″ phase to S′ phase during creep process. Meanwhile, excess solute atoms in supersaturated solid solution dynamically precipitated to further form finer S′ phase and S″ phase, which pinned the dislocations and impeded the dislocation movements. Large amount of dislocations piled up around the micron-scale Al9FeNi phase, and a lot of dislocation walls were generated along 〈220〉 orientation. S phase accumulates around these defects. The interaction between dislocations and precipitates was beneficial for the improved performances at elevated temperature.

Keywords

Aging Treatment Creep Behavior Bright Field Image Select Area Electron Diffraction Pattern Diffraction Spot 

Notes

Acknowledgement

The authors acknowledge the financial support from Heilongjiang Province Science Fund for the Distinguished Young Scholars under program JC201013.

References

  1. 1.
    Novy F, Janecek M, Kral R (2009) J Alloy Compd 487:146CrossRefGoogle Scholar
  2. 2.
    Bergsma SC, Li X (1996) J Mater Eng Perform 5:100CrossRefGoogle Scholar
  3. 3.
    Wang J, Yi D, Su X, Yin F (2008) Mater Charact 59:965CrossRefGoogle Scholar
  4. 4.
    Ber LB (2000) Mater Sci Eng A 280:83CrossRefGoogle Scholar
  5. 5.
    Bardi F, Cabibbo M, Spigarelli S (2002) Mater Sci Eng 334:87CrossRefGoogle Scholar
  6. 6.
    Yu K, Li W, Li S, Zhao J (2004) Mater Sci Eng A 368:88CrossRefGoogle Scholar
  7. 7.
    Majimel J, Molenat G, Casanove MJ (2002) Scripta Mater 46:113CrossRefGoogle Scholar
  8. 8.
    Roldan M, Sifferlent R (1972) Acta Metall 20:829CrossRefGoogle Scholar
  9. 9.
    Singer R, Blum WZ (1977) Metallkde 68:328Google Scholar
  10. 10.
    Wang G-j, Xiong B-q, Zhang Y-a, Li Z-h, Li P-y (2009) Int J Miner Metall Mater 16:427CrossRefGoogle Scholar
  11. 11.
    Djakovic A, Basoalto HC, Dyson BF, McLean M (2005) Metalurgija 11:257Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Northeast Light Alloy Co., Ltd.HarbinChina
  2. 2.State Key Laboratory for Fabrication and Processing of Nonferrous MetalsGeneral Research Institute for Nonferrous MetalsBeijingChina

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