Skip to main content
SpringerLink
Log in

Effect of casting temperature on microstructure in a directionally solidified Ni-44Ti-5Al-2Nb-1Mo alloy

  • Published:
Rare Metals Aims and scope Submit manuscript

Abstract

Ni-44Ti-5Al-2Nb-1Mo (atomic fraction, %) alloy was directional solidified (DS) at different temperature (1350, 1450, 1550, 1650 °C) and a constant withdrawing rate of 100 μm/s, by liquid metal cooling method. The microstructural characteristics indicate that the DS temperature do not influence the phase composition, but rather to change the phase morphology. The phase composition of directional solidified samples is the same as the as-cast sample, which is composed of NiTi (B2), Ti2Ni and Nb-rich phases. After DS, [100] becomes the preferred orientation in NiTi matrix. With the casting temperature increasing, [100] orientation is significantly enhanced, the solid/liquid (S/L) interface morphology changes from cellular dendrite to cellular, and the interface shape changes from convex to plane. Meantime, the volume fraction of the Nb-rich phase decreases with the temperature increasing.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  1. Otsuka K., and Wayman C. M., Shape Memory Materials, Cambridge University Press, London, 1998: 1

    Google Scholar 

  2. Duerig T. W., Melton K. N., Proft J. L., and Duerig T. W., Engineering Aspects of Shape Memory Alloys, Btterworth-Heinemann, London, 1990: 130.

    Google Scholar 

  3. Warren P., Murakami Y., Koizumi Y., and Harada H., Phase separation in NiTi-Ni2TiAl alloy system, Mater Sci. Eng. A, 1997, 223A: 36.

    Google Scholar 

  4. Jung J., Ghosh G., and Olson G. B., A comparative study of precipitation behavior of Heusler phase (Ni2TiAl) from B2-TiNi in Ni-Ti-Al and Ni-Ti-AI-X (X = Hf, Pd, Pt, Zr) alloys, Acta Materialia, 2003, 51(20): 6341.

    Article  CAS  Google Scholar 

  5. Huneau B., Rogl P., Zeng K., Schmid-Fetzer R., Bohn M., and Bauer J., The ternary system Al-Ni-Ti Part 1: Isothermal section at 900 °C; Experimental investigation and thermodynamic calculation, Intermetallics, 1999, 7: 1337.

    Article  CAS  Google Scholar 

  6. Meng L. J., Li Y., Zhao X.Q., and Xu H.B., Effect of Nb on strengthening mechanism of Ti-rich TiNiAl Intermetallics, Acta Aeronaut et Astronaut Sin, 2007, 28(5): 1206.

    CAS  Google Scholar 

  7. Xu J., Zhao X. Q., Gong S.K., and Xu H. B., Effect of Nb on the high temperature oxidation behavior of TiNiAl alloys, Acta Metall Sin, 2006, 42(8): 820.

    CAS  Google Scholar 

  8. Song X.Y., Li S.S., and Li Y., Effect of Ni/Ti ratio on the microstructure and mechanical properties of Mo-doped NiTiAl intermetallics, International Journal of Modern Physics B, 2010, 24(15–16): 2694.

    Article  CAS  Google Scholar 

  9. Min P., Shuichi M., Kazuhiro O., and Narimasa N., Effects of Nb addition on the microstructure of Ti-Ni alloy, Materials Transactions, 1992, 33(4): 340.

    Google Scholar 

  10. Zhang H. R., Gao M., Tang X. X., and Zhang H., Interaction between Ti-47Al-2Cr-2Nb alloy and Y2O3 ceramic during directional solidification, Acta Metall Sin, 2010, 46(7): 890.

    Article  CAS  Google Scholar 

  11. Karunaratne M. S. A., Carter P., and Reed R.C., On the diffusion of aluminium and titanium in the Ni-rich Ni-Al-Ti system between 900°C and 1200°C. Acta Materialia, 2001, 49(5): 861.

    Article  CAS  Google Scholar 

  12. Giamei A. F., and Tschinkel J. G.. Metallurgical Transactions A, 1976, 7A(9): 1427.

    Article  CAS  Google Scholar 

  13. Meng L. J., Li Y., Zhao X. Q., et al. The mechanical properties of intermetallic Ni50−x Ti50Alx alloys (x = 6, 7, 8, 9), Intermetallics, 2007, 15: 814.

    Article  CAS  Google Scholar 

  14. Xu H. B., Meng L. J., Xu J., et al. Mechanical properties and oxidation characteristics of TiNiAl(Nb) intermetallics. Intermetallics, 2007, 15: 778.

    Article  CAS  Google Scholar 

  15. Wilson L. A. W., and Howe J. M., Effect of alloying additions on β′ precipitation in NiAl-Ti base alloys, Acta Materialia, 2001, 49(14): 2653.

    Article  CAS  Google Scholar 

  16. Jung J., Ghosh G., Isheim D., et al. Precipitation of Heusler phase (Ni2TiAl) from B2-TiNi in Ni-Ti-Al and Ni-Ti-Al-X (X = Hf, Zr) alloys, Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science, 2003, 34A(6): 1221.

    Article  CAS  Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Department of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing, 100191, China

    Qing Pan, Lijing Zheng, Yurong Sang, Yan Li, Lei Zhou & Hu Zhang

Authors
  1. Qing Pan
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Lijing Zheng
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Yurong Sang
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Yan Li
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Lei Zhou
    View author publications

    You can also search for this author in PubMed Google Scholar

  6. Hu Zhang
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Hu Zhang.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Pan, Q., Zheng, L., Sang, Y. et al. Effect of casting temperature on microstructure in a directionally solidified Ni-44Ti-5Al-2Nb-1Mo alloy. Rare Metals 30 (Suppl 1), 349–353 (2011). https://doi.org/10.1007/s12598-011-0301-x

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s12598-011-0301-x

Keywords

Search

Navigation