Quantitative phase evolution during mechano-synthesis of Ti-Ni-Cu shape memory alloys
Author
Amini, R.
Alijani, F.
Ghaffari, M.
Alizadeh, M.
Okyay, Ali Kemal
Date
2012-05-29Source Title
Journal of Alloys and Compounds
Print ISSN
0925-8388
Publisher
Elsevier
Volume
538
Pages
253 - 257
Language
English
Type
ArticleItem Usage Stats
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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.
Keywords
Amorphous phaseMartensitic 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
Permalink
http://hdl.handle.net/11693/21296Published Version (Please cite this version)
http://dx.doi.org/10.1016/j.jallcom.2012.05.084Collections
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