Face-centered-cubic to hexagonal-close-packed transformation in nanocrystalline Ni(Si) by mechanical alloying

Authors
Datta, MK Pabi, SK Murty, BS
Citation
Mk. Datta et al., Face-centered-cubic to hexagonal-close-packed transformation in nanocrystalline Ni(Si) by mechanical alloying, J MATER RES, 15(7), 2000, pp. 1429-1432
Citations number
20
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF MATERIALS RESEARCH
ISSN journal
08842914 → ACNP
Volume
15
Issue
7
Year of publication
2000
Pages
1429 - 1432
Database
ISI
SICI code
0884-2914(200007)15:7<1429:FTHTIN>2.0.ZU;2-R
Abstract
An allotropic transition from face-centered-cubic (fcc) to hexagonal-close- packed (hcp) Ni(Si) solid solution in Ni95Si5 and Ni90Si10 during nanocryst allization by mechanical alloying is reported. The transformation was ident ified as a defect-induced melting accompanied by a volume expansion of 8.6% and was observed when fee 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 gene rated at the onset of transformation.