Stress analysis of spontaneous Sn whisker growth |
| |
Authors: | K N Tu Chih Chen Albert T Wu |
| |
Affiliation: | (1) Department of Materials Science and Engineering, UCLA, Los Angeles, CA 90095-1595, USA;(2) Department of Materials Science and Engineering, National Chiao Tung University, Hsinchu, 30050, Taiwan, ROC;(3) Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan, ROC |
| |
Abstract: | Spontaneous Sn whisker growth is a surface relief phenomenon of creep, driven by a compressive stress gradient. No externally
applied stress is required for the growth, and the compressive stress is generated within, from the chemical reaction between
Sn and Cu to form the intermetallic compound Cu6Sn5 at room temperature. To obtain the compressive stress gradient, a break of the protective oxide on the Sn surface is required
because the free surface of the break is stress-free. Thus, spontaneous Sn whisker growth is unique that stress relaxation
accompanies stress generation. One of the whisker challenging issues in understanding and in finding effective methods to
prevent spontaneous Sn whisker growth is to develop accelerated tests of whisker growth. Use of electromigration on short
Sn stripes can facilitate this. The stress distribution around the vicinity and the root of a whisker can be obtained by using
the micro-beam X-ray diffraction utilizing synchrotron radiation. A discussion of how to prevent spontaneous Sn whisker growth
by blocking both stress generation and stress relaxation is given. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|