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

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      Author
      Amini, R.
      Alijani, F.
      Ghaffari, M.
      Alizadeh, M.
      Okyay, Ali Kemal
      Date
      2012-05-29
      Source Title
      Journal of Alloys and Compounds
      Print ISSN
      0925-8388
      Publisher
      Elsevier
      Volume
      538
      Pages
      253 - 257
      Language
      English
      Type
      Article
      Item Usage Stats
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      108
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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 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
      Permalink
      http://hdl.handle.net/11693/21296
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.jallcom.2012.05.084
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
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