Effects of milling and annealing on formation and structural characterization of nanocrystalline intermetallic compounds from Ni-Ti elemental powders

Date
2012
Authors
Ghadimi, M.
Shokuhfar, A.
Rostami H.R.
Ghaffari, M.
Advisor
Instructor
Source Title
Materials Letters
Print ISSN
0167577X
Electronic ISSN
Publisher
Volume
80
Issue
Pages
181 - 183
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
Abstract

Nickel and Titanium elemental powders with a nominal composition Ni-50 at.%Ti were mechanical alloyed in a planetary high-energy ball mill in different milling conditions (5, 10, 20, 40 and 60 h). The investigation revealed that increasing milling time leads to a reduction in crystallite size, and after 60 h of milling, the Ti dissolved in Ni lattice and NiTi (B2) phase was obtained. With milling time, morphology of pre-alloyed powders changed from lamella to globular. Annealing of as-milled powders at 1173 K for 900 s led to formation of nanocrystalline NiTi (B19′), grain growth and release of internal strain. The results indicated that this technique is a powerful and high productive process for preparing NiTi intermetallic compound with nanocrystalline structure and appropriate morphology. © 2012 Elsevier B.V. All rights reserved.

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Keywords
Electron microscopy, Intermetallic alloys and compounds, Nanocrystalline materials, Phase transformation, Shape memory materials, X-ray techniques, As-milled powders, Elemental powders, High energy, Intermetallic alloys and compounds, Internal strains, Milling conditions, Milling time, Nano-crystalline NiTi, Nano-crystalline structures, Nanocrystallines, Nominal composition, Pre-alloyed powder, Productive process, Shape-memory materials, Structural characterization, X-ray techniques, Ball mills, Electron microscopy, Grain growth, Intermetallics, Mechanical alloying, Milling (machining), Morphology, Nanocrystalline materials, Phase transitions, Powders, Soldering alloys, Titanium, Nanocrystalline powders
Citation
Published Version (Please cite this version)