Abstract
The congruently melting, single phase, intermetallic Ni5Ge3 has been subject to rapid solidification via drop-tube processing wherein powders with diameters between 850–150 μm are produced. At these cooling rates (850–150 μm diameter particles, 700–7800 K s−1) the dominant solidification morphology, revealed after etching, is that of isolated plate and lath microstructure in an otherwise featureless matrix. Selected area diffraction analysis in the TEM reveals the plate and lath are a disordered variant of ε-Ni5Ge3, whilst the featureless matrix is the ordered variant of the same compound. Microvicker hardness test result shows that mechanical properties improve with decreasing the particle size from 850 to 150 μm as a consequence of increasing the cooling rate.
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References
Ellner M, Gödecke T, Schubert K (1971) Zur struktur der mischung Nickel-Germanium. J Less Common Met 24:23–40
Nash A, Nash P (1987) The Ge−Ni (Germanium-Nickel) system. J Phase Equilib 8:255–264
Liu Y, Ma D, Du Y (2010) Thermodynamic modeling of the germanium–nickel system. J Alloy Compd 491:63–71
Jin S, Leinenbach C, Wang J, Duarte LI, Delsante S, Borzone G, Scott A, Watson A (2012) Thermodynamic study and re-assessment of the Ge-Ni system. Calphad 38:23–34
Nash A, Nash P (1976) Binary alloy phase diagrams. US national bureau of standards monograph series 25. Elsevier, ASM, Ohio, p 35
Haque N, Cochrane RF, Mullis AM (2017) The role of recrystallization in spontaneous grain refinement of rapidly solidified Ni3Ge. Metall Mater Trans A 1–8
Haque N, Cochrane RF, Mullis AM (2016) Rapid solidification morphologies in Ni 3 Ge: spherulites, dendrites and dense-branched fractal structures. Intermetallics 76:70–77
Hyman M, McCullough C, Valencia J, Levi C, Mehrabian R (1989) Microstructure evolution in TiAl alloys with B additions: conventional solidification. Metall Trans A 20:1847
McCullough C, Valencia J, Levi C, Mehrabian R (1990) Microstructural analysis of rapidly solidified Ti-Al-X powders. Mater Sci Eng A 124:83–101
Broderick T, Jackson A, Jones H, Froes F (1985) The effect of cooling conditions on the microstructure of rapidly solidified Ti-6Al-4V. Metall Trans A 16:1951–1959
Haque N, Cochrane RF, Mullis AM (2016) Disorder-order morphologies in drop-tube processed Ni 3 Ge: dendritic and seaweed growth. J Alloy Compd
Haque N, Cochrane RF, Mullis AM (2017) Morphology of order-disorder structures in rapidly solidified L12 intermetallics. In: TMS 2017 146th annual meeting and Exhibition Supplemental Proceedings. Springer, pp 729–736
Haque N, Cochrane RF, Mullis AM (2017) Morphology of spherulites in rapidly solidified Ni3Ge droplets. Crystals 7:100
Acknowledgements
Nafisul Haque is thankful to the Higher Education Commission (HEC) Pakistan and NED University of Engineering and Technology for financial support.
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© 2018 The Minerals, Metals & Materials Society
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Haque, N., Cochrane, R.F., Mullis, A.M. (2018). Mechanical Properties of Rapidly Solidified Ni5Ge3 Intermetallic. In: & Materials Society, T. (eds) TMS 2018 147th Annual Meeting & Exhibition Supplemental Proceedings. TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72526-0_66
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DOI: https://doi.org/10.1007/978-3-319-72526-0_66
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