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Doping-induced simultaneous improvement of strength and ductility in ultrafine grained gold wires

Published online by Cambridge University Press:  03 March 2011

Y.H. Chew ,
C.C. Wong ,
C.D. Breach ,
F. Wulff  and
T.Y. Lew
Y.H. Chew*
Affiliation:
Materials and Applications Center, Kulicke & Soffa (S.E.A.) Pte. Ltd., Singapore 569871
C.C. Wong
Affiliation:
School of Materials Engineering, Nanyang Technological University, Singapore 639798
C.D. Breach
Affiliation:
Materials and Applications Center, Kulicke & Soffa (S.E.A.) Pte. Ltd., Singapore 569871
F. Wulff
Affiliation:
Materials and Applications Center, Kulicke & Soffa (S.E.A.) Pte. Ltd., Singapore 569871
T.Y. Lew
Affiliation:
School of Materials Engineering, Nanyang Technological University, Singapore 639798
*
a) Address all correspondence to this author. e-mail: echew@kns.com
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Abstract

The room temperature tensile properties of ultrafine-grained 25-μm gold wires were evaluated as a function of calcium (Ca) doping at various strain rates ranging between 10−3 and 10−1 s−1. Paradoxically, the increased amount of Ca was found to simultaneously increase the strength and ductility of the Au wires. However, based on scanning electron microscopy and tensile characterization, the grain size distributions, strain-hardening rate, and strain rate sensitivity of Au wires did not change with Ca, thus showing that neither grain refinement nor plastic instability are likely to be responsible for the concurrent improvement of strength and ductility.

Keywords

DopantDuctilityStrength

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Type
Articles
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Journal of Materials Research , Volume 21 , Issue 9 , September 2006 , pp. 2345 - 2353
Copyright
Copyright © Materials Research Society 2006

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