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Indentation creep of lead-free Sn-Bi solder alloys as replacements of Sn-Pb used in microelectronic packaging

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4 Author(s)
R. Mahmudi ; School of Metallurgical and Materials Engineering, University of Tehran, Tehran, Iran. ; A. R. Geranmayeh ; S. R. Mahmoodi ; A. Khalatbari

Creep behavior of three lead-free Sn-Bi alloys with 1-5 wt.% Bi, together with the Sn-37%Pb solder alloy as the material for comparison, was studied by Vickers indentation testing at room temperature. The stress exponents in the range 13-16, determined through different indentation methods, are in good agreement. The measured exponents imply that dislocation movement is the possible mechanism during room-temperature creep deformation of these solders alloys. All three tin-based alloys showed creep resistances higher than that of the Sn-37%Pb alloy. Creep resistance increased by increasing Bi content of the alloys.

Published in:

Electronics Manufacturing and Technology, 31st International Conference on

Date of Conference:

8-10 Nov. 2007