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Synthesis of FeNiCoTi powder alloy by mechanical alloying and investigation of magnetic and shape memory properties

Gheiratmand, T ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1007/s10948-012-1506-4
  3. Publisher: Springer , 2012
  4. Abstract:
  5. FeNiCo base powder alloy with nominal composition Fe-27Ni-17Co-4Ti (wt%) was prepared from elemental powders by mechanical alloying. The structure of milled powders was characterized by XRD and SEM. The effect of nanosize structure on magnetic properties and shape memory behavior was studied using VSM and DSC. After milling for 240 minutes by high energy vibrational ball mill under argon atmosphere, supersaturated solid solution formed with mean crystallite size of ∼20 nm. Results of VSM examinations showed that by milling for 240 minutes saturation magnetization and intrinsic coercivity reached 304 emu/gr and 21 Oe, respectively. XRD analyses made it clear that transformation from BCC to FCC phase has occurred after annealing supersaturated milled powder at 650°C for 60 minutes. DSC curves indicated that martensite transformation in this alloy was suppressed due to refinement of the microstructure
  6. Keywords:
  7. Argon atmospheres ; DSC curves ; Elemental powders ; FCC phase ; FeNiCoTi ; High energy ; Intrinsic coercivity ; Martensite transformations ; Milled powders ; Nano-size ; Nominal composition ; Powder alloys ; Shape memory ; Shape memory behavior ; Shape-memory properties ; Supersaturated solid solutions ; XRD ; XRD analysis ; Ball mills ; Magnetic properties ; Mechanical alloying ; Milling (machining) ; Nanostructures ; Powders ; Saturation magnetization ; Alloys
  8. Source: Journal of Superconductivity and Novel Magnetism ; Volume 25, Issue 6 , March , 2012 , Pages 1893-1899 ; 15571939 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs10948-012-1506-4