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Joining behaviour of crystalline and amorphous Zr-based alloy using Cu-based braze

Chiu, Yen-Lin (2014)
M.Phil. thesis, University of Birmingham.

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Abstract

The objective of this research was to understand the melting and wetting behaviour of braze alloys and mechanical properties of brazed joints for pure zirconium plates and the Zr-based bulk metallic glass (BMG), Vitreloy 105 (Zr\(_5\)\(_2\)\(_.\)\(_5\)Cu\(_1\)\(_7\).\(_9\)Ni\(_1\)\(_4\)\(_.\)\(_6\)Al\(_1\)\(_0\)Ti\(_5\)). Active brazing alloy, Cusil ABA (Ag\(_6\)\(_3\)Cu\(_3\)\(_5\)\(_.\)\(_2\)\(_3\)Ti\(_1\)\(_.\)\(_7\)\(_5\)), has been used to braze Zr plates in the Gleeble 3500 thermo- mechanical simulator under vacuum at 3 temperatures (840, 940 and 1000 \(^o\)C) and with Vitreloy105 at 780 \(^o\)C. The shear strength of the brazed Zr-plate increased at lower brazing temperatures; brazing of Vitreloy 105 plates was not successful as the brazing temperature, (Cusil ABA liquidus temperature) exceeded its crystallisation temperature Tx=440 \(^o\)C leading to crystallization and embrittlement during to brazing. As a result, three BMG compositions (Mg\(_6\)\(_5\)Cu\(_1\)\(_5\)Ag\(_1\)\(_0\)Tb\(_1\)\(_0\)\(_,\)Zn\(_4\)\(_0\)Mg\(_1\)\(_1\)Ca\(_3\)\(_1\)Yb\(_1\)\(_8\) and Ca\(_6\)\(_5\)Mg\(_1\)\(_5\)Zn\(_2\)\(_0\)) as potential brazes for Vitreloy 105 with liquidus temperatures below the crystallisation temperature and high values of fracture strength have been selected to predict (using Thermo- Calc) the equilibrium reaction between substrate and braze prior to manufacture in order to estimate likely wettability and joint strength.

Type of Work:M.Phil. thesis.
Supervisor(s):Strangwood, Martin
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Metallurgy and Materials
Subjects:TA Engineering (General). Civil engineering (General)
Institution:University of Birmingham
ID Code:4853
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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