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Microstructure and mechanical properties of electron beam weld joints of a Zr41Ti14Cu12Ni10Be23 bulk metallic glass with Zr

Published online by Cambridge University Press:  03 March 2011

R. Bhowmick ,
S. Bysakh ,
Y. Kawamura ,
M. Yamasaki ,
U. Ramamurty  and
K. Chattopadhyay
R. Bhowmick
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
S. Bysakh
Affiliation:
Defense Metallurgical Research Laboratory, Hyderabad 500058, India
Y. Kawamura
Affiliation:
Department of Materials Science and Engineering, Shock Wave and Condensed Matter Research Center, Kumamoto University, Kumamoto 860-8555, Japan
M. Yamasaki
Affiliation:
Department of Materials Science and Engineering, Shock Wave and Condensed Matter Research Center, Kumamoto University, Kumamoto 860-8555, Japan
U. Ramamurty
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
K. Chattopadhyay*
Affiliation:
Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India
*
a) Address all correspondence to this author. e-mail: kamanio@materials.iisc.ernet.in
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Abstract

The electron beam welding technique was used to join Zr41Ti14Cu12Ni10Be23 bulk metallic glass (BMG) to crystalline pure Zr. Compositional, microstructural, and mechanical property variations across the welded interface were evaluated. It is shown that a crystalline layer develops close to the welding interface. Transmission electron microscopy of this layer indicates the crystalline phase to be tetragonal with lattice parameters close to that reported for Zr2Ni. However, the composition of this phase is different as it contains other alloying additions. The interface layer close to the bulk metallic glass side contains nanocrystalline Zr2Cu phase embedded in the glassy matrix. Nanoindentation experiments indicate that the hardness of the crystalline layer, although less than the bulk metallic glass, is more than the Zr itself. Commensurately, tensile tests indicate that the failure of the welded samples occurs at the Zr side rather than at the weld joint.

Keywords

AmorphousTransmission electron microscopy (TEM)Welding
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 2 , September 2006 , pp. 437 - 444
Copyright
Copyright © Materials Research Society 2007

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