Multiplication and rearrangement of dislocations in face-centered cubic (FCC) metals during tensile deformation are affected by grain size, stacking fault energy (SFE), and solute elements. X-ray diffraction (XRD) line-profile analysis can evaluate the dislocation density (ρ) and dislocation arrangement (M) from the strength of the interaction between dislocations. However, the relationship between M and ρ has not been thoroughly addressed. In this study, multiplication and rearrangement of dislocations in FCC metals during tensile deformation was evaluated by XRD line-profile analysis. Furthermore, the effects of grain size, SFE, and solute elements on the extent of dislocation rearrangement were evaluated with varying M values during tensile deformation. M decreased as the dislocation density increased. By contrast, grain size and SFE did not exhibit a significant influence on the obtained M values. The influence of solute species and concentration of solute elements on M changes were also determined. In addition, the relationship between dislocation substructures and M for tensile deformed metals were also explained. Dislocations were loosely distributed at M > 1, and cell walls gradually formed by gathering dislocations at M < 1. While cell walls became thicker with decreasing M in metals with low stacking fault energy, thin cell walls with high dislocation density formed for an M value of 0.3 in metals with high stacking fault energy.
Relationship between dislocation multiplication and work hardening of tensile deformed Cu Zn alloys with different grain sizes was investigated. X ray diffraction line pro le analysis was employed to evaluate dislocation parameters. It was con rmed that dislocation multiplication was enhanced with a decrease in the grain sizes. This was mainly caused by GN Geometrically Necessary dislocation, which was characterized by KAM Kernel Average Misorientation in EBSD Electron Back Scatter Diffraction . The strength of dislocation hardening was evaluated from the α value in the Bailey Hirsch equation:The α values were estimated by plotting the ow stress against square root of dislocation density. The α values became smaller with the decrease in the grain sizes, suggesting that the strength of dislocations hardening for unit length of dislocation became smaller. In order to elucidate the origin of the relationship between the grain size and the α values, the in uence of grain size on the fraction of GN dislocation density as well as the outer radius of dislocation strain eld. Whereas the effect of the fraction of the GN dislocation on the α values was small, the outer radius of dislocation strain eld strongly affected the α values.
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