Synthesis of FeNiCoTi Powder Alloy by Mechanical Alloying and Investigation of Magnetic and Shape Memory Properties

• Published in: Journal of superconductivity and novel magnetism Vol. 25; no. 6; pp. 1893 - 1899
• Main Authors: Gheiratmand, T., Madaah Hosseini, H. R.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.08.2012; Springer
• Subjects: Alloy powders; Alloying elements; Ball milling; Characterization and Evaluation of Materials; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Cross-disciplinary physics: materials science; rheology; Differential scanning calorimetry; Domain effects, magnetization curves, and hysteresis; Exact sciences and technology; Ferrous alloys; Magnetic Materials; Magnetic properties and materials; Magnetism; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Martensitic transformations; Materials science; Materials synthesis; materials processing; Nanostructure; Original Paper; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Physics; Physics and Astronomy; Shape memory alloys; Strongly Correlated Systems; Superconductivity; Transformations; Treatment of materials and its effects on microstructure and properties; FeNiCoTi; Nanostructure; Mechanical alloying; Shape memory; Magnetic properties; Differential scanning calorimetry; Scanning electron microscopy; FCC lattices; Ball mill; XRD; Nanostructures; Powder metallurgy; Shape memory effects; BCC lattices; Coercive force; Chemical composition; Supersaturated solid solution; Saturation magnetization; Iron base alloys
• ISSN: 1557-1939; 1557-1947
• DOI: 10.1007/s10948-012-1506-4

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.