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Face-centered-cubic to Hexagonal-close-packed Transformation in Nanocrystalline Ni(Si) by Mechanical Alloying

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Abstract

An allotropic transition from face-centered-cubic (fcc) to hexagonal-close-packed (hcp) Ni(Si) solid solution in Ni95Si5 and Ni90Si10 during nanocrystallization by mechanical alloying is reported. The transformation was identified as a defect-induced melting accompanied by a volume expansion of 8.6% and was observed when fcc Ni(Si) reached a critical crystallite size of 10 nm. Calculation based on equation of state showed that a 37% reduction in tetragonal shear modulus and a negative pressure of about 8.7 GPa were generated at the onset of transformation.

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  1. B. S. Murty

    Present address: National Research Institute for Metals, Tsukuba, 305-0047, Japan

Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur, 721 302, India

    M. K. Datta, S. K. Pabi & B. S. Murty

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  1. M. K. Datta
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  2. S. K. Pabi
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  3. B. S. Murty
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Datta, M.K., Pabi, S.K. & Murty, B.S. Face-centered-cubic to Hexagonal-close-packed Transformation in Nanocrystalline Ni(Si) by Mechanical Alloying. Journal of Materials Research 15, 1429–1432 (2000). https://doi.org/10.1557/JMR.2000.0206

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  • DOI: https://doi.org/10.1557/JMR.2000.0206

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