Quantitative phase evolution during mechano-synthesis of Ti-Ni-Cu shape memory alloys

Date
2012-05-29
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Source Title
Journal of Alloys and Compounds
Print ISSN
0925-8388
Electronic ISSN
Publisher
Elsevier
Volume
538
Issue
Pages
253 - 257
Language
English
Type
Article
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Abstract

Ti-41Ni-9Cu shape memory alloy was synthesized by mechanical alloying of pure elemental Ti, Ni, and Cu powders using high-energy ball milling. The qualitative and quantitative phase analyses of the as-milled powders were done by X-ray diffraction (XRD) using Rietveld refinement and the alloys microstructure was studied by scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). Concerning the results, by milling evolution, the dissolution of the primary materials occurred at different rates and a considerable amount of the amorphous phase as well as B19′-martensite and B2-austenite was created. The formation of Ni solid solution was also evidenced prior to its dissolution. It was found that at sufficient milling time, the mechano-crystallization of the amorphous phase occurred and at the end of milling, the B19′-martensite is the dominant phase of the structure.

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Keywords
Amorphous phase, Martensitic phase transformation, Mechanical alloying, TiNiCu shape memory alloys, Amorphous phase, As-milled powders, Cu powders, High-energy ball milling, Martensitic phase transformations, Mechanosynthesis, Milling time, Phase evolutions, Primary materials, Quantitative phase analysis, TiNiCu shape memory alloys, Ball milling, Dissolution, High resolution transmission electron microscopy, Martensite, Mechanical alloying, Milling (machining), Powders, Rietveld refinement, Scanning electron microscopy, X ray diffraction, X ray powder diffraction, Shape memory effect
Citation
Published Version (Please cite this version)