J Fail. Anal and Preven.(2013)13: 194-201 appearance of the failed (a) Plane 口口口口口口口口 口口口口口口口口 schematic diagram of sample 口口口口口口口口口 口口口口口口口口口 口口口口口口口口口 口口口口口口口口 口口口口口口口口口 口口口口口口口口 Wetting 口口口口口口 口口口口 EM 口口口口口口口口 口口口口口口口 口口口口口口 口口口口口 (b) -40 um (c d) Fig. 3 SEM results of the un-wetted pad (a) Un-wetting pad displays flatness, (b)coarse grains under 2,000x, (e)coarse grain under 4,000x and(d) crystalline interface cracFig. 2 Macroscopic appearance of the failed sample. (a) Plane configuration of sample, (b) schematic diagram of sample Fig. 3 SEM results of the un-wetted pad. (a) Un-wetting pad displays flatness, (b) coarse grains under 2,0009, (c) coarse grain under 4,0009, and (d) crystalline interface cracking 196 J Fail. Anal. and Preven. (2013) 13:194–201 123