XRD and HRTEM analyses of the ball milled nanocrystalline FeCo alloy

Article
Received:
Accepted:
  • 141 Downloads

Abstract

The nanostructures of the ball milled FeCo particles were characterized as functions of the ball milling time (t) using quantitative X-ray diffraction (XRD), high resolution transmission electron microscopy (HRTEM) analysis techniques. The results show that the nanocrystalline bcc FeCo particles are available using carbonyl iron and cobalt powders as the start materials during the high-energy ball milling. At the early stage of ball milling, Co powders are easily mashed into nanocrystalllites, by which the surface of the larger Fe particles of about 80–150 nm is coated. With t increasing, the refinement of grain size and the incorporation of defects including dislocations, disclinations and grain boundaries happen, and then FeCo alloy with a certain layered structure is formed, finally the layered structure disappears with the formation of isotropic grains having a steadystate grain size in the nanometer regime after a certain period of t.

Key words

high energy ball milling carbonyl iron cobalt alloy nanocrystalline materials 
This is a preview of subscription content, log in to check access.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. [1]
    M W Chen, E Ma, K J Hemker,et al. Deformation Twin-ning in Nanocrystalline Aluminum.Science, 2003, 300: 1275CrossRefGoogle Scholar
  2. [2]
    H Gleiter. Progress in Nanostructured Materials.Prog. Mater. Sci., 1989, 33: 233CrossRefGoogle Scholar
  3. [3]
    J P Wilcoxon, P P Provencio. Use of Surfactant Micelles to Control the Sturctural Phase of Nanosize Iron Clusters.J. Phys. Chem. B, 1999, 103: 9 809Google Scholar
  4. [4]
    E E Carpenter, J A Sims, J A Wienmann,et al. Magnetic Properties of Iron and Iron Platinum Alloys Synthesized via Microemulsion Techniques.J. Appl. Phys., 2000, 87: 5615Google Scholar
  5. [5]
    A Martino, M Stoker, M Hicks,et al. The Synthesis and Characterization of Iron Colloid Catalysts in Inverse Micelle Solutions.Appl. Catalysis A: General, 1997, 161: 235CrossRefGoogle Scholar
  6. [6]
    X M Lin, C M Sorensen, K J Klabunde,et al. Control of Cobalt Nanoparticle Size by the Germ Growth Methos in Inve-rse Micelle System: Size Dependent Magnetic Properties.J. Mater. Res., 1999, 14: 1542CrossRefGoogle Scholar
  7. [7]
    D C Douglass, A J Cox, J P Bucher,et al. Magnetic Proper-ties of Free Cobalt and Gadolinium Clusters.Phys. Rev., 1993, B47: 12874Google Scholar
  8. [8]
    C C Koch. The Synthesis and Structure of Nanocrystalline Ma-terials Produced by Mechanical Attrition: A Review.Nano-struct. Mater., 1993, 2: 109CrossRefGoogle Scholar
  9. [9]
    C C Koch. Synthesis of Nanostructured Materials by Mechani-cal Milling: Problems and Opportunities.Nanostruct. Mater., 1997, 9: 13CrossRefGoogle Scholar
  10. [10]
    H J Fecht. Nanostructure Formation by Mechanical Attrition.Nanostruct. Mater., 1995, 6: 33CrossRefGoogle Scholar
  11. [11]
    M Murayama, J M Howe, H Hidaka,et al. Atomic-Level Ob-servation of Disclination Dipoles in Mechanically Milled Nano-crystalline Fe.Science, 2002, 259: 2 433Google Scholar
  12. [12]
    M Murayama, J M Howe, H Hidaka,et al. High-resolution TEM Analysis of Defect Structures in Mechanically Milled Nanocrystalline Fe.IS1J International, 2003, 43: 755CrossRefGoogle Scholar
  13. [13]
    Joint Committee on Powder Diffraction Standards.Powder Diffraction File. Swarthmore, PA, 1990, No. 60696Google Scholar
  14. [14]
    H P Klug, L E Alexander.X-ray Diffraction Procedures for Polycrystalline and Amorphous Materials, 2nd ed. John Wiley and Sons, New York, 1974, Chapter 9Google Scholar
  15. [15]
    V G Harris, M Liou, B N Das,et al. Pappas. Structure and Magnetism of Multi-Phase Sm0.080 Co0.645 Fe0.276 Powders.J. Appl. Phys., 1997, 81: 5 121Google Scholar

Copyright information

© Wuhan University of Technology 2006

Authors and Affiliations

  • Wang Qi
    • 1
    • 2
  • Wang Wei
    • 1
  • Guan Jianguo
    • 1
  • Zhang Qingjie
    • 1
  1. 1.State Key Lab of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhanChina
  2. 2.School of Materials Science and EngineeringJinan UniversityJinanChina

Personalised recommendations