Effect of orientation on tensile ductility of electrodeposited bulk nanocrystalline Ni–W alloys

Effect of orientation on tensile ductility of electrodeposited bulk nanocrystalline Ni–W alloys was studied. Bulk nanocrystalline Ni–W alloys with different textures were prepared by electrodeposition, varying the amount of saccharin sodium and the bath temperature. An elongation of 0–13.4% was obtained in a tensile test. Although there was no relationship between tensile ductility and the grain size or W content, there was the relationship between tensile ductility and the orientation index for the (200) plane in the bulk nanocrystalline Ni–W alloys. In fact, no plastic deformability was observed when the index was below 1, while the tensile ductility increased with increasing orientation index above a value of 1. The cross-sectional TEM observations indicate the colony structure of electrodeposits varied in orientation. The results of this study point to that the colony structure of electrodeposits has an effect on the tensile ductility.