Crack Initiation and Propagation Evaluation for Sn-5Sb Solder Under Low-Cycle Fatigue

doi:10.1007/s40195-017-0605-4

Abstract

Abstract:

In this study, a crack initiation and propagation behavior of Sn-5Sb lead-free solder under low-cycle fatigue is discussed. Cyclic push-pull loading tests with a single-hole specimen have been conducted at 313 K to investigate the crack initiation and propagation behavior of Sn-5Sb solder which has a higher melting point temperature than that of Sn-Ag-Cu solders. A fatigue life ratio correlates with the crack length within a small scatter. Crack initiates at the early stage, and almost all the life period is crack propagation process independent of strain range and strain rate. The crack propagation rate depends on the strain range and the strain rate. The adaptation of J-integral value for Sn-5Sb solder is also discussed. J-integral value is a suitable parameter for crack propagation rate evaluation.

Key words: Crack initiation, Crack propagation, J-integral range, Small size specimen, Sn–5Sb solder

Noritake Hiyoshi. Crack Initiation and Propagation Evaluation for Sn-5Sb Solder Under Low-Cycle Fatigue[J]. Acta Metallurgica Sinica (English Letters), 2017, 30(9): 851-856.

Figures/Tables 10

Table 1 Chemical composition of Sn-5Sb solder (mass%)

Sn	Ag	Cu	Sb	Bi	Pb	Zn	Fe	Al	As
Bal.	<0.0001	0.0002	4.9901	0.0002	0.003	<0.0001	0.0006	<0.0001	0.0024

Fig. 1 Shape and dimensions of the specimen (mm)

Fig. 2 Crack propagation observations after the tests

Fig. 3 Microstructure of Sn-5Sb solder tested

Fig. 4 Crack length as a function of fatigue life ratio a effect of strain range, b effect of strain rate

Table 2 Crack initiation cycle and failure cycle for Sn-5Sb solder

Strain rate, ε (%/s)	0.01		0.1						0.5
Strain range, Δε (%)	0.5		0.3		0.5		1.0		0.5
N_i: Crack initiation cycle N_f: Failure cycle	N_i	N_f	N_i	N_f	N_i	N_f	N_i	N_f	N_i	N_f
N_i: Crack initiation cycle N_f: Failure cycle	88	2760	200	3111	100	3967	88	710	100	2870

Fig. 5 Crack propagation curves of Sn-5Sb solder

Fig. 6 Crack propagation cycles when 2a = 5 mm a effect of strain range, b effect of strain rate

Fig. 7 Load-displacement curve

Fig. 8 Relationship between crack propagation rate and ΔJ

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