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

Published online by Cambridge University Press:  31 January 2011

M. K. Datta ,
S. K. Pabi  and
B. S. Murty
M. K. Datta
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur-721 302, India
S. K. Pabi
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur-721 302, India
B. S. Murty
Affiliation:
Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Kharagpur-721 302, India
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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.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 15 , Issue 7 , July 2000 , pp. 1429 - 1432
Copyright
Copyright © Materials Research Society 2000

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