Sn–Ag–Cu (SAC) alloys are considered as good replacements of Sn–Pb alloys which are banned due to the toxic nature of Pb. But, SAC alloys have a coarse microstructure that consists of β-Sn rich and eutectic phases. Nanoindentation is a useful technique to evaluate the mechanical properties at very small length scale. In this work, continuous stiffness measurement (CSM) nanoindentation setup (CSM Instruments SA, Peseux, Switzerland) is used to determine the individual phase mechanical properties like Young's modulus and hardness at high temperatures. It is demonstrated that these properties are a function of temperature for both β-Sn rich and eutectic phases. Loadings starting from 500 μN up to 5000 μN are used with 500 μN steps and average values are presented for Young's modulus and hardness. The loading rates applied are twice that of the loadings. High temperatures result in a higher creep deformation and therefore, to avoid it, different dwell times are used at peak loads. The special pileup effect, which is more significant at elevated temperatures, is determined and incorporated into the results. A better agreement is found with the previous studies.
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September 2015
Research-Article
Individual Phase Mechanical Properties at Different Temperatures of Sn–Ag–Cu Lead-Free Solders Incorporating Special Pileup Effects Using Nanoindentation
Muhammad Sadiq,
Muhammad Sadiq
University of Engineering &
e-mail: msadiq3@gatech.edu
Technology Peshawar
,Peshawar 25000 KPK
, Pakistan
e-mail: msadiq3@gatech.edu
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Jean-Sebastien Lecomte,
LEM3 UMR CNRS 7239,
4 rue Augustin Fresnel,
Jean-Sebastien Lecomte
ENSAM-Arts et Métiers ParisTech
,LEM3 UMR CNRS 7239,
4 rue Augustin Fresnel,
Metz 57078
, France
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Mohammed Cherkaoui
Mohammed Cherkaoui
George W. Woodruff School
of Mechanical Engineering,
801 Ferst Drive NW,
of Mechanical Engineering,
Georgia Institute of Technology
,801 Ferst Drive NW,
Atlanta, GA 30332
Search for other works by this author on:
Muhammad Sadiq
University of Engineering &
e-mail: msadiq3@gatech.edu
Technology Peshawar
,Peshawar 25000 KPK
, Pakistan
e-mail: msadiq3@gatech.edu
Jean-Sebastien Lecomte
ENSAM-Arts et Métiers ParisTech
,LEM3 UMR CNRS 7239,
4 rue Augustin Fresnel,
Metz 57078
, France
Mohammed Cherkaoui
George W. Woodruff School
of Mechanical Engineering,
801 Ferst Drive NW,
of Mechanical Engineering,
Georgia Institute of Technology
,801 Ferst Drive NW,
Atlanta, GA 30332
Contributed by the Electronic and Photonic Packaging Division of ASME for publication in the JOURNAL OF ELECTRONIC PACKAGING. Manuscript received December 12, 2013; final manuscript received October 10, 2014; published online April 17, 2015. Assoc. Editor: Tong Cui.
J. Electron. Packag. Sep 2015, 137(3): 031005 (5 pages)
Published Online: September 1, 2015
Article history
Received:
December 12, 2013
Revision Received:
October 10, 2014
Online:
April 17, 2015
Citation
Sadiq, M., Lecomte, J., and Cherkaoui, M. (September 1, 2015). "Individual Phase Mechanical Properties at Different Temperatures of Sn–Ag–Cu Lead-Free Solders Incorporating Special Pileup Effects Using Nanoindentation." ASME. J. Electron. Packag. September 2015; 137(3): 031005. https://doi.org/10.1115/1.4029836
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