Impression creep of Sn3.5Ag eutectic alloy

Fuqian Yang, Lingling Peng

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


The creep behavior of Sn3.5Ag eutectic alloy was investigated by using impression technique in the temperature range of 333-453 K and under the punching stress range of 3.4-67.1 MPa. Using a power law between the steady-state impression velocity and the punching stress, it was found the activation energy increases with the punching stress from 44.7 kJ/mol at 6.7 MPa to 79.2 kJ/mol at 46.9 MPa and the stress exponent changes from 1.03 (3.4-13.4 MPa) to 5.9 (20.1-40.2 MPa). However, by using a hyperbolic sine function between the steady-state impression velocity and the punching stress, a single activation energy was found to be 51.0 kJ/mol, which is close to the activation energy for grain boundary diffusion in pure Sn. This suggests that a single mechanism of grain boundary fluid flow is likely the controlling mechanism for the time-dependent plastic flow of Sn3.5Ag eutectic alloy under the testing conditions.

Original languageEnglish
Pages (from-to)87-92
Number of pages6
JournalMaterials Science and Engineering: A
Issue number1-2
StatePublished - Nov 15 2005

Bibliographical note

Funding Information:
This research is supported by NSF through a grant DMR-0211706 monitored by Drs. Guebre Tessema and Bruce A. MacDonald.


  • Activation energy
  • Constitutive relation
  • Eutectic alloy
  • Plastic flow

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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