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Effects of High-Speed Deformation on the Phase Stability and Interdiffusion in Ultrasonically Joined Aluminum and Zinc Foils

Published online by Cambridge University Press:  01 February 2011

Ibrahim Emre Gunduz ,
Emily D. Shattuck ,
Teiichi Ando ,
Peter Y. Wong  and
Charalabos C. Doumanidis
Ibrahim Emre Gunduz
Affiliation:
Mechanical and Industrial Engineering Department, Northeastern University, Boston MA 02115
Emily D. Shattuck
Affiliation:
Department of Mechanical Engineering, Tufts University, Medford, MA 02155
Teiichi Ando
Affiliation:
Mechanical and Industrial Engineering Department, Northeastern University, Boston MA 02115
Peter Y. Wong
Affiliation:
Department of Mechanical Engineering, Tufts University, Medford, MA 02155
Charalabos C. Doumanidis
Affiliation:
Department of Mechanical and Manufacturing Engineering, University of Cyprus, Cyprus
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Abstract

The effects of high strain-rate deformation on the phase stability and interdiffusion were investigated for Al-Zn welds produced by ultrasonic welding at 513 K. The welds exhibited three distinct regions: a featureless region indicative of local melting on the zinc side, a solidified mushy layer and a layer of fcc grains enriched with zinc. Al-Zn phase diagrams calculated from vacancy-modified Gibbs free energy curves indicate that local melting at the weld interface may result even at 513 K if the vacancy concentrations in the fcc and hcp solutions approach 0.07 as a result of high strain-rate deformation. EDS analysis of the weld interface yielded an interdiffusivity of 1.9 μm2/s, which is five orders of magnitude larger than the normal diffusivity of zinc in aluminum at 513 K. Application of the mono-vacancy diffusion mechanism to the diffusion data also yields a vacancy concentration of 0.07, indicating that such a high vacancy concentration may indeed resulted during the ultrasonic welding at 513 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 843: Symposium T – Surface Engineering-Fundamentals and Applications , 2004 , T3.22
Copyright
Copyright © Materials Research Society 2005

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References

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