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Formation of High-Strength Zr-Nb-Cu-Ni-Al Alloys by Warm Extrusion of Gas Atomized Powders

Published online by Cambridge University Press:  01 February 2011

E. A. Rozhkova ,
X. Y. Yang ,
P. B. Wheelock ,
J. Eckert ,
U. Kühn  and
D. J. Sordelet
E. A. Rozhkova
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (USDOE), Iowa State University, Ames, Iowa 50011
X. Y. Yang
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (USDOE), Iowa State University, Ames, Iowa 50011
P. B. Wheelock
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (USDOE), Iowa State University, Ames, Iowa 50011
J. Eckert
Affiliation:
Technische Universitat Darmstadt, D-64287 Darmstadt, Germany
U. Kühn
Affiliation:
IFW Dresden, PO Box 270016, D-01171 Dresden, Germany
D. J. Sordelet
Affiliation:
Materials and Engineering Physics Program, Ames Laboratory (USDOE), Iowa State University, Ames, Iowa 50011
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Abstract

Recently developed Zr-based metallic glass composites containing a ductile phase demonstrate improved mechanical properties such as high strength combined with good ductility compared to the glass monoliths. Zr-Nb-Cu-Ni-Al amorphous powders with bcc phase precipitates were obtained by high pressure gas atomization. Formation of the bcc phase in the amorphous matrix strongly depends on the material composition and cooling rates during solidification. Melt spinning using various wheel speeds selected to simulate the cooling rates during gas atomization was used to define a specific composition for gas atomization. Gas atomized powders were consolidated by warm extrusion. Various processing conditions including starting powder particle size, extrusion temperature and extrusion ratio were examined to obtain materials having various microstructural features. Structure and thermal stability of consolidated bulk metallic glass composites as well as selected mechanical properties will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 806: Symposium MM – Amorphous and Nanocrystalline Metals , 2003 , MM2.4
Copyright
Copyright © Materials Research Society 2004

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References

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