Mechanical fatigue of Sn-rich Pb-free solder alloys

IMR OpenIR

	Mechanical fatigue of Sn-rich Pb-free solder alloys
	J. K. Shang; Q. L. Zeng; L. Zhang; Q. S. Zhu
	2007
发表期刊	Journal of Materials Science-Materials in Electronics
ISSN	0957-4522
卷号	18 期号:1-3 页码:211-227
摘要	Recent fatigue studies of Sn-rich Pb-free solder alloys are reviewed to provide an overview of the current understanding of cyclic deformation, cyclic softening, fatigue crack initiation, fatigue crack growth, and fatigue life behavior in these alloys. Because of their low melting temperatures, these alloys demonstrated extensive cyclic creep deformation at room temperature. Limited amount of data have shown that the cyclic creep rate is strongly dependent on stress amplitude, peak stress, stress ratio and cyclic frequency. At constant cyclic strain amplitudes, most Sn-rich alloys exhibit cycle-dependent and cyclic softening. The softening is more pronounced at larger strain amplitudes and higher temperatures, and in fine grain structures. Characteristic of these alloys, fatigue cracks tend to initiate at grain and phase boundaries very early in the fatigue life, involving considerable amount of grain boundary cavitation and sliding. The growth of fatigue cracks in these alloys may follow both transgranular and intergranular paths, depending on the stress ratio and frequency of the cyclic loading. At low stress ratios and high frequencies, fatigue crack growth rate correlates well with the range of stress intensities or J-integrals but the time-dependent C* integral provides a better correlation with the crack velocity at high stress ratios and low frequencies. The fatigue life of the alloys is a strong function of the strain amplitude, cyclic frequency, temperature, and microstructure. While a few sets of fatigue life data are available, these data, when analyzed in terms of the Coffin-Mason equation, showed large variations, with the fatigue ductility exponent ranging from -0.43 to -1.14 and the fatigue ductility from 0.04 to 20.9. Several approaches have been suggested to explain the differences in the fatigue life behavior, including revision of the Coffin-Mason analysis and use of alternative fatigue life models.
部门归属	univ illinois, dept mat sci & engn, urbana, il 61801 usa. chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china.;shang, jk (reprint author), univ illinois, dept mat sci & engn, urbana, il 61801 usa;jkshang@uiuc.edu
关键词	Low-cycle Fatigue Lead-free Solders Crack-growth-behavior Thermal Fatigue 63sn-37pb Solder Eutectic Solder Thermomechanical Fatigue Ag-cu Joints Life
URL	查看原文
WOS记录号	WOS:000242853600014
引用统计	被引频次：48[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/33800
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. K. Shang,Q. L. Zeng,L. Zhang,et al. Mechanical fatigue of Sn-rich Pb-free solder alloys[J]. Journal of Materials Science-Materials in Electronics,2007,18(1-3):211-227.
APA	J. K. Shang,Q. L. Zeng,L. Zhang,&Q. S. Zhu.(2007).Mechanical fatigue of Sn-rich Pb-free solder alloys.Journal of Materials Science-Materials in Electronics,18(1-3),211-227.
MLA	J. K. Shang,et al."Mechanical fatigue of Sn-rich Pb-free solder alloys".Journal of Materials Science-Materials in Electronics 18.1-3(2007):211-227.