Effect of Aluminum on Microstructure, Mechanical Properties and Castability of a Directionally Solidified Superalloy

  • Zheng Tan
  • Jian Tong
  • Wenshu Tang
  • Likui Ning
  • Enze Liu
  • Zhi Zheng
  • Yichuan Liu
Conference paper


The effect of aluminum (Al) on microstructure, mechanical properties, solidification behavior, segregation and castability of a directionally solidified Ni-based superalloy was investigated. It was found that the dendrite arm spacing and volume fraction of carbides slightly decreased, while the volume fraction of the γ/γ′ eutectic decreased distinctly with the decrease of Al content. When Al content reduced, the tensile properties at room temperature slightly decreased while the stress rupture life reduced significantly at 980 °C/235 MPa. The change of liquid volume fraction slightly reduced while the residual liquids were more inclined to remain thin continuous network form during the solidification in the alloy with low Al content. The segregation degree of Cr, Mo and W decreased with decreasing Al content, while Co, Al and Ta were more likely to segregate towards the interdendritic regions in the alloy with low Al content. The castability of alloy was getting worse with decreasing Al content.


Superalloy DZ4125L Aluminum Microstructure Mechanical properties Castability 



The authors acknowledge the financial support by National Natural Science Foundation of China (No. 51601145).


  1. 1.
    R.C. Reed, The Superalloys: Fundamentals and Applications, Cambridge University Press, London, 2006.Google Scholar
  2. 2.
    J. Zhang, Y.R. Zheng, Q. Feng, Study on rejuvenation heat treatment of a directionally solidified superalloy DZ125 damaged by creep, Acta Metall. Sin. 52 (2016) 717–726.Google Scholar
  3. 3.
    L. Wang, B.B. Xu, L. Liu, J.X. Dong, Effects of Remelting Temperature on the Segregation and Rayleigh Number in the Mushy Zone of Directionally Solidified Superalloy Inconel 718, Rare Metal Mat. Eng. 46 (2017) 565–570.Google Scholar
  4. 4.
    L.K. Ning, Z. Zheng, F.Q. An, S. Tang, J. Tong, H.S. Ji, H.W. Yu, Thermal fatigue behavior of K125L superalloy, Rare Metals 35 (2016) 172–176.Google Scholar
  5. 5.
    F.X. Yang, E.Z. Liu, Z. Zhi, J. Tong, L.K. Ning, Influence of Ti content on microstructure, mechanical properties and castability of directionally solidified superalloy DZ125L, Mater. Des. 61 (2014) 41–49.Google Scholar
  6. 6.
    K. Heck, J.R. Blackford, R.F. Singer, Castability of directionally solidified nickel base superalloys, Mater. Sci. Technol. 15 (1999) 213–220.Google Scholar
  7. 7.
    J. Zhang, R.F. Singer, Effect of hafnium on the castability of directionally solidified nickel-base superalloys, Z. Metallkd. 93 (2002) 806–811.Google Scholar
  8. 8.
    J. Zhang, Effect of Ti and Ta on hot cracking susceptibility of directionally solidified Ni-based superalloy IN792, Scr. Mater. 48 (2003) 677–681.Google Scholar
  9. 9.
    J.J. Yang, F.Z. Li, Z.M. Wang, X.Y. Zeng, J. Mater. Process. Technol. 225 (2015) 229–239.Google Scholar
  10. 10.
    J. Zhang, R.F. Singer, Effect of Zr and B on castability of Ni-based superalloy IN792, Metall. Mater. Trans. A 35 (2004) 1337–1342.Google Scholar
  11. 11.
    Y.Z. Zhou, A. Volek, Effect of carbon additions on hot tearing of a second generation nickel-base superalloy, Mater. Sci. Eng. A 479 (2008) 324–332.Google Scholar
  12. 12.
    D. Heydari, A.S. Fard, A. Bakhshi, J.M. Drezet, Hot tearing in polycrystalline Ni-based IN738LC superalloy: Influence of Zr content, J. Mater. Process. Technol. 214 (2014) 681–687.Google Scholar
  13. 13.
    J. Zhang, R.F. Singer, Hot tearing of nickel-based superalloys during directional solidification, Acta Mater. 50 (2002) 1869–1879.Google Scholar
  14. 14.
    Y.Z. Zhou, A. Volek, Effect of dendrite arm spacing on castability of a directionally solidified nickel alloy, Scr. Mater. 56 (2007) 537–540.Google Scholar
  15. 15.
    N. Wang, S. Mokadem, M. Rappaz, W. Kurz, Solidification cracking of superalloy single- and bi-crystals, Acta Mater. 52 (2004) 3173–3182.Google Scholar
  16. 16.
    Y.S. Guan, E.Z. Liu, X.R. Guan, Z. Zheng, J. Mater. Sci. Technol. 32 (2016) 271–281.Google Scholar
  17. 17.
    Z.X. Shi, J.X. Dong, M.C. Zhang, L. Zheng, J. Alloy. Compd. 571 (2013) 168–177.Google Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Zheng Tan
    • 1
  • Jian Tong
    • 1
  • Wenshu Tang
    • 2
  • Likui Ning
    • 1
  • Enze Liu
    • 1
  • Zhi Zheng
    • 1
  • Yichuan Liu
    • 1
    • 3
  1. 1.Superalloys DivisionInstitute of Metal Research, Chinese Academy SciencesShenyangChina
  2. 2.Xi’an Thermal Power Research Institute Co., Ltd.Xi’anChina
  3. 3.School of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefeiChina

Personalised recommendations