Microstructure and mechanical properties of electron beam weld joints of a $Zr_{41}Ti_{14}Cu_{12}Ni_{10}Be_{23}$ bulk metallic glass with Zr

Bhowmick, R and Bysakh, S and Kawamura, Y and Yamasaki, M and Ramamurty, U and Chattopadhyay, K (2007) Microstructure and mechanical properties of electron beam weld joints of a $Zr_{41}Ti_{14}Cu_{12}Ni_{10}Be_{23}$ bulk metallic glass with Zr. In: Journal of Materials Research, 22 (2). pp. 437-444.

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Abstract

The electron beam welding technique was used to join $Zr_{41}Ti_{14}Cu_{12}Ni_{10}Be_{23}$ 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 $Zr_2Ni$. 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 $Zr_2Cu$ 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.

Item Type:	Journal Article
Publication:	Journal of Materials Research
Publisher:	Material Research Society
Additional Information:	Copyright of this article belongs to Material Research Society.
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	29 Jul 2008
Last Modified:	19 Sep 2010 04:48
URI:	http://eprints.iisc.ac.in/id/eprint/15295

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