期刊
MATERIALS & DESIGN
卷 110, 期 -, 页码 275-283出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2016.08.007
关键词
Lead-free solder; Microstructure; Mechanical properties; Intermetallic compound
资金
- University of New South Wales (UNSW) [RG124326]
This paper describes the changes in microstructures and their effects on property degradations in an environmentally friendly eutectic Sn-0.7Cu (wt.%) solder alloy when subjected to harsh service conditions. A thorough microscopy investigation was conducted by scanning electron microscopy (SEM), electron backscattered diffraction (EBSD) and diffraction analysis with transmission electron microscopy (TEM). In the as-received alloy Cu6Sn5 intermetallic compound (IMC) particles are dispersed in the grain interiors and grain boundaries of beta-Sn matrix. When the alloy was exposed for 60 days at 150 degrees C, the size of Cu6Sn5 IMC particles and Sn matrix grains were increased significantly. As a result the mechanical reliability of electronic interconnections turned inferior. This was confirmed by measuring a range of electrical and mechanical properties that include electrical resistivity, Young's moduli, shear moduli, microhardness and nano indentation creep behaviour. A comparison between the as-received and age-treated alloy shows that the degradation in Young's and shear moduli was about 10.6 and 9.9%, respectively, and that in hardness was about 25%. However the age treatment improved the damping property of the alloy. (C) 2016 Elsevier Ltd. All rights reserved.
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