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Solid state synthesis of nanocrystalline and/or amorphous 50Ni-50Ti alloy
Singapore Institute of Mfg. Technol..
Singapore Institute of Mfg. Technol..
Singapore Institute of Mfg. Technol..
School of Mechanical/Production Eng., Nanyang Technological University, Nanyang Avenue, Singapore.
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2005 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, Vol. 392, no 1-2, 222-228 p.Article in journal (Refereed) Published
Abstract [en]

A nanocrystalline/amorphous 50Ni-50Ti alloy was produced by solid state synthesis via mechanical alloying from elemental Ti and Ni powders. Using X-ray diffraction analysis and transmission electron microscopy techniques, a mechanically induced solid state reaction of 50Ni-50Ti was investigated. Results showed that nanocrystalline and amorphous Ni-Ti phases were obtained after mechanical alloying. The mechanical alloying of 50Ni-50Ti for 270 ks led to the formation of f.c.c. Ni(Ti) solid solution, characterized by a lattice parameter of 0.3558 nm, crystallite size of 14 nm and lattice strain of 0.98%. The particle size decreased with increasing milling time. The crystallite size of mechanically alloyed 50Ni-50Ti powders was substantially refined as the milling proceeded and the lattice strain increased with the milling time. The steady-state crystallite size was approximately 10-15 nm. The internal lattice strain in Ni-Ti alloy led to the disordering and the subsequent formation of amorphous alloy during mechanical alloying. After heat treatment at 1100 °C, the as-milled powders transformed into B2-NiTi phase and a small amount of Ti2Ni phase. © 2004 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2005. Vol. 392, no 1-2, 222-228 p.
Keyword [en]
Amorphous, Mechanical alloying, Nanocrystalline, Ni, Solid solution, Ti, Amorphous alloys, Heat treatment, Lattice constants, Nanostructured materials, Nickel alloys, Particle size analysis, Reaction kinetics, Strain, Synthesis (chemical), Transmission electron microscopy, X ray diffraction analysis, 50Ni-50Ti alloy, Crystallite size, Lattice strain, Solid state reaction, Titanium alloys, nickel alloy
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-16645DOI: 10.1016/j.msea.2004.09.025OAI: oai:DiVA.org:hj-16645DiVA: diva2:454469
Available from: 2011-11-07 Created: 2011-11-07 Last updated: 2015-06-01Bibliographically approved

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