Loading...

Synthesis of a nanostructured MgH2-Ti alloy composite for hydrogen storage via combined vacuum arc remelting and mechanical alloying

Mahmoudi, N ; Sharif University of Technology

1479 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.matlet.2011.01.036
  3. Abstract:
  4. To improve the hydrogen kinetics of magnesium hydride, TiCr 1.2Fe0.6 alloy was prepared by vacuum arc remelting (VAR) and the alloy was co-milled with MgH2 to process nanostructured MgH2-5 at.% TiCr1.2Fe0.6 powder. The hydrogen desorption properties of the composite powder were studied and compared with pure magnesium hydride. X-ray diffraction (XRD) analysis showed that the composite powder prepared by VAR/mechanical alloying (MA) procedure consisted of β-MgH2, γ-MgH2, bcc Ti-Cr-Fe alloy, and small amount of MgO. The average size of particles and their grain structure after 4 h MA were determined by a laser particle size analyzer and XRD method and found to be 194 nm and 11 nm, respectively. The hydrogen desorption temperature of magnesium hydride decreased from 426 °C to 235 °C by the bcc Ti alloy and the utilized processing method, i.e. combined VAR/MA
  5. Keywords:
  6. Average size ; Combined vacuum ; Composite powders ; Grain structures ; Hydrogen desorption ; Hydrogen desorption temperatures ; Hydrogen kinetics ; Intermetallic alloys and compounds ; Laser particle size analyzer ; Magnesium hydride ; Nano-structured ; Processing method ; Pure magnesium ; Ti alloys ; Vacuum arc remelting ; XRD ; Alloys ; Chromium alloys ; Composite materials ; Crystal microstructure ; Dehydrogenation ; Desorption ; Hydrogen ; Hydrogen storage ; Iron alloys ; Magnesium ; Magnesium powder ; Mechanical alloying ; Particle size analysis ; Remelting ; Vacuum ; Vacuum applications ; X ray diffraction ; X ray diffraction analysis ; Titanium alloys
  7. Source: Materials Letters ; Volume 65, Issue 7 , 2011 , Pages 1120-1122 ; 0167577X (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0167577X11000577