Regensburg 2007 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 44: Mechanical properties III

MM 44.3: Talk

Friday, March 30, 2007, 13:00–13:15, H6

Mechanical properties of multicomponent Fe-based glassy alloys — •Uwe Siegel, Uta Kühn, and Jürgen Eckert — Leibniz Institute for Solid State and Materials Research Dresden, PF 27 01 16, D-01171 Dresden

We report on phase formation and mechanical properties of a multicomponent (Fe44,3Cr5Co5Mo12,8Mn11,2C15,8B5,9)98,5Y1,5 glass-forming alloy. The material was prepared as thin ribbons and in form of rods. The samples were investigated by X-ray diffraction, scanning and transmission electron microscopy and DSC measurements. The alloy shows a high glass forming ability (critical casting thickness 12 mm) and high compressive strength (~3000 MPa) but no yielding and strain hardening during room temperature deformation [1]. Therefore the alloy was used as a starting material for investigations concerning the improvement of the mechanical properties. The influence of heat treatments and composition changes on the phase formation and mechanical properties were examined. The strength of (Fe44,3Cr5Co5Mo12,8Mn11,2C15,8B5,9)98,5Y1,5-alloy was found to increase up to ~3500 MPa by the replacement of Cr by Co and up to ~4000 MPa by the replacement of Co by Cr. The addition of elements like Nb or Ag leads to a two phase microstructure consisting of an amorphous matrix and crystalline phases. The microstructure and the mechanical properties of these alloys will be presented.

References: [1] Z. P. Lu, C. T. Liu, J. R. Thompson, W. D. Porter, Phys. Rev. Lett. 92 (2004) 24.