Journal of Materials Research

Articles

Pseudo-binary phase diagram for Zr-based in situ β phase composites

S.Y. Leea1 c1, C.P. Kima2, J.D. Almera3, U. Lienerta3, E. Ustundaga4 and W.L. Johnsona5

a1 Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011

a2 Department of Materials Science, California Institute of Technology, Pasadena, California 91125

a3 Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439

a4 Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011

a5 Department of Materials Science, California Institute of Technology, Pasadena, California 91125

Abstract

The pseudo-binary (quasi-equilibrium) phase diagram for Zr-based bulk metallic glasses with crystalline in situ precipitates (β phase) has been constructed from high-temperature phase information and chemical composition analysis. The phase evolution was detected in situ by high-energy synchrotron x-ray diffraction followed by Rietveld analysis of the data for volume fraction estimation. The phase diagram delineates phase fields and allows the control of phase fractions. Combined with related previous work by the authors, this diagram offers a unique opportunity to control both the morphology and volume of the dendritic β phase precipitates to enhance the properties of the composites.

(Received June 17 2006)

(Accepted October 31 2006)

Key Words:

  • Composite;
  • Phase equilibria;
  • X-ray diffraction (XRD)

Correspondence:

c1 Address all correspondence to this author. e-mail: sylee@iastate.edu

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