Sensitivity to Fatigue Cracks Initiation of Symmetrical <110>Tilt Grain Boundaries in Pure Copper Bicrystals in 1M NaNO2 Solution

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Sensitivity to corrosion fatigue (CF) crack initiation has been investigated in a series of pure copper bicrystals with a symmetrical <110>-tilt grain boundary. Tests were performed by axial tension-compression tests in 1M NaNO2 solutions. The small-angle tilt bicrystals fractured in both intergranular and transgranular manners accompanied by a large amount of plastic strain to fracture while the large-angle bicrystals fractured in almost intergranular manner with a smaller plastic strain. Susceptibility to CF cracks increases with increasing misorientation. It seems that effect of grain boundaries structures, i.e., Σ-values is small in this experiment. Stress concentration generated by the pile-up of trapped dislocations at the grain boundary could account for the high susceptibility of the intergranular cracks in large-angle grain boundaries

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Periodical:

Materials Science Forum (Volumes 561-565)

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Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee

Pages:

2415-2418

Citation:

H. Miyamoto et al., "Sensitivity to Fatigue Cracks Initiation of Symmetrical <110>Tilt Grain Boundaries in Pure Copper Bicrystals in 1M NaNO2 Solution", Materials Science Forum, Vols. 561-565, pp. 2415-2418, 2007

Online since:

October 2007

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$38.00

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