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Microstructure and mechanical properties of slowly cooled Cu47.5Zr47.5Al5

Published online by Cambridge University Press:  03 March 2011

J. Das ,
S. Pauly ,
C. Duhamel ,
B.C. Wei  and
J. Eckert
J. Das*
Affiliation:
FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, D-64287 Darmstadt, Germany; and Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, D-01069 Dresden, Germany
S. Pauly
Affiliation:
FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, D-64287 Darmstadt, Germany
C. Duhamel
Affiliation:
FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, D-64287 Darmstadt, Germany
B.C. Wei
Affiliation:
Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
J. Eckert
Affiliation:
FG Physikalische Metallkunde, FB 11 Material- und Geowissenschaften, Technische Universität Darmstadt, D-64287 Darmstadt, Germany; and Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, D-01069 Dresden, Germany
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Cu47.5Zr47.5Al5 was prepared by arc melting and solidified in situ by suction casting into 2–5-mm-diameter rods under various cooling rates (200–2000 K/s). The microstructure was investigated along the length of the rods by electron microscopy, differential scanning calorimetry and mechanical properties were investigated under compression. The microstructure of differently prepared specimens consists of macroscopic spherical shape chemically inhomogeneous regions together with a low volume fraction of randomly distributed CuZr B2 phase embedded in a 2–7 nm size clustered “glassy-martensite” matrix. The as-cast specimens show high yield strength (1721 MPa), pronounced work-hardening behavior up to 2116 MPa and large fracture strain up to 12.1–15.1%. The fracture strain decreases with increasing casting diameter. The presence of chemical inhomogenities and nanoscale “glassy-martensite” features are beneficial for improving the inherent ductility of the metallic glass.

Keywords

AmorphousCastingDuctility
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 2 , September 2006 , pp. 326 - 333
Copyright
Copyright © Materials Research Society 2007

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