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pp 1–6 | Cite as

Order–Disorder Morphologies in Rapidly Solidified Ni3Ge Intermetallic

  • Nafisul HaqueEmail author
  • Andrew M. Mullis
Precipitation Mechanisms in Non-ferrous Alloys
  • 6 Downloads

Abstract

Congruently melting intermetallic, single-phase Ni3Ge (Tm = 1132°C) has been rapidly solidified via drop-tube processing, wherein powders, with diameters between ≥ 850 μm and ≤ 38 μm, with equivalent cooling rates of ≤ 700 to > 54,500 K s−1, were produced. Six dominant solidification morphologies were identified with increasing cooling rate, explicitly, (I) spherulites, (II) mixed spherulites and dendrites, (III) dendrites—orthogonal, (IV) dendrites—nonorthogonal, (V) recrystallized, and (VI) dendritic seaweed, are observed imbedded within a featureless matrix. Selected area diffraction (SAD) in the transmission electron microscope analysis confirmed that it is only the spherulite microstructure that is partially ordered among these microstructures, which are disordered. However, SAD analysis indicated that the featureless background material of all of these microstructures is chemically ordered. Thermal analysis indicates a nonreversible reaction.

Notes

Acknowledgements

The authors acknowledged financial support from Higher Education Commission (HEC) Pakistan and NED University of Engineering and Technology.

References

  1. 1.
    J. Magill, J. Mater. Sci. 36, 3143 (2001).CrossRefGoogle Scholar
  2. 2.
    L. Gránásy, T. Pusztai, G. Tegze, J.A. Warren, and J.F. Douglas, Phys. Rev. E 72, 011605 (2005).CrossRefGoogle Scholar
  3. 3.
    K. Ziewiec, J. Alloys Compd. 397, 207 (2005).CrossRefGoogle Scholar
  4. 4.
    K. Chrissafis, M. Maragakis, K. Efthimiadis, and E. Polychroniadis, J. Alloys Compd. 386, 165 (2005).CrossRefGoogle Scholar
  5. 5.
    T. Yano, Y. Yorikado, and Y. Akeno, Mater. Trans. 46, 2886 (2005).CrossRefGoogle Scholar
  6. 6.
    C. Xia, L. Xing, W.-Y. Long, Z.-Y. Li, and Y. Li, J. Alloys Compd. 484, 698 (2009).CrossRefGoogle Scholar
  7. 7.
    J. Liu, H. Zhang, H. Fu, Z.-Q. Hu, and X. Yuan, J. Mater. Res. 25, 1159 (2010).CrossRefGoogle Scholar
  8. 8.
    H. Sun and K.M. Flores, Intermetallics 19, 1538 (2011).CrossRefGoogle Scholar
  9. 9.
    H. Sun and K.M. Flores, Intermetallics 43, 53 (2013).CrossRefGoogle Scholar
  10. 10.
    H. Keith and F. Padden Jr, J. Appl. Phys. 34, 2409 (1963).CrossRefGoogle Scholar
  11. 11.
    H.W. Morse, C.H. Warren, and J.D.H. Donnay, Am. J. Sci. 23, 421 (1932).CrossRefGoogle Scholar
  12. 12.
    A. Nash and P. Nash, U.S. National Bureau of Standards Monograph Series 25 (Ohio: Elsevier, 1976).zbMATHGoogle Scholar
  13. 13.
    N. Haque, R.F. Cochrane, and A.M. Mullis, Intermetallics 76, 70 (2016).CrossRefGoogle Scholar
  14. 14.
    N. Haque, R.F. Cochrane, and A.M. Mullis, Metall. Mater. Trans. A 48, 5424 (2017).CrossRefGoogle Scholar
  15. 15.
    R. Ahmad, R.F. Cochrane, and A.M. Mullis, J. Mater. Sci. 47, 2411 (2012).CrossRefGoogle Scholar
  16. 16.
    A. Nash and P. Nash, J. Phase Equilibria 8, 255 (1987).Google Scholar
  17. 17.
    N. Haque, R.F. Cochrane, and A.M. Mullis, Crystals 7, 100 (2017).CrossRefGoogle Scholar
  18. 18.
    N. Haque, R.F. Cochrane, and A.M. Mullis, J. Alloys Compd. 707, 327 (2017).CrossRefGoogle Scholar
  19. 19.
    R. Ahmad, R.F. Cochrane, and A.M. Mullis, J. Mater. Sci. 47, 2411 (2012).CrossRefGoogle Scholar
  20. 20.
    E.G. Castle, A.M. Mullis, and R.F. Cochrane, Acta Mater. 77, 76 (2014).CrossRefGoogle Scholar
  21. 21.
    K. Dragnevski, R.F. Cochrane, and A.M. Mullis, Phys. Rev. Lett. 89, 215502 (2002).CrossRefGoogle Scholar
  22. 22.
    E.G. Castle, A.M. Mullis, and R.F. Cochrane, Acta Mater. 66, 378 (2014).CrossRefGoogle Scholar
  23. 23.
    N. Haque, R.F. Cochrane, and A.M. Mullis, J. Alloys Compd. 739, 160 (2018).CrossRefGoogle Scholar

Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.School of Chemical and Process EngineeringUniversity of LeedsLeedsUK
  2. 2.Department of Metallurgical EngineeringNEDUETKarachiPakistan

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