Temperature dependence of mechanical properties of individual phases in Sn-3.0Ag-0.5Cu lead-free solder alloy

Feng Gao, Hiroshi Nishikawa, Tadashi Takemoto, Jianmin Qu

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

The commercial Sn-3.0Ag-0.5Cu (SAC) lead-free solder alloy consists of Sn-rich and eutectic phases. The mechanical properties of these individual phases were demonstrated to be a function of the temperature. The nano-indentation equipment assembled with advanced-controlled hot-stage was utilized to examine the mechanical characteristics. The experiments were performed at 60°C, 80°C, 110°C, 130°C and 150°C, respectively. It was found that for both Sn-rich phase and eutectic phase, the mechanical properties, such as hardness and elastic modulus, exhibited the dependence on the temperature. In particular, the creep deformation at the dwell time of constant target load exhibited high sensitivity to the temperature. Generally, the higher temperature resulted in a larger creep deformation, which in turn impacted the strain rate sensitivity of the individual phases. The Sn-rich phase showed larger creep deformation than that of eutectic phase. However, the much larger strain rate sensitivity index value was obtained for eutectic phase at the lower temperature than 150°0C The activity energy of Sn-rich phase was derived based on the relation of strain rates versus temperature.

Original languageEnglish
Title of host publication2008 Proceedings 58th Electronic Components and Technology Conference, ECTC
Pages466-471
Number of pages6
DOIs
StatePublished - 2008
Event2008 58th Electronic Components and Technology Conference, ECTC - Lake Buena Vista, FL, United States
Duration: 27 May 200830 May 2008

Publication series

NameProceedings - Electronic Components and Technology Conference
ISSN (Print)0569-5503

Conference

Conference2008 58th Electronic Components and Technology Conference, ECTC
Country/TerritoryUnited States
CityLake Buena Vista, FL
Period27/05/0830/05/08

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