Characterization of Dislocation Rearrangement in FCC Metals during Work Hardening Using X-ray Diffraction Line-Profile Analysis

Koutarou Nakagawa,Shigeo Sato,Hirotaka Matsunaga,Shigeru Suzuki,Kazunari Maki,Kozue Takano-Satoh,Momoki Hayashi,Hiroyuki Mori,Yusuke Onuki

doi:10.3390/qubs4040036

Abstract

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.

Highlights

The extent of dislocation rearrangement during plastic deformation in face-centered cubic (FCC) metallic materials is affected by stacking fault energy (SFE) and solute elements interaction [1,2,3]
The analytical methods conducted in the current study are not the same as the ones reported in the literature, it may be derived that the line-profile analysis is effective to investigate plastic deformation processes in FCC alloys containing different solute elements
The relationship betw√een dislocation substructures and dislocation arrangement parameters (M), expressed as M = Re ρ, was investigated in tensile-deformed FCC metals using X-ray diffraction line-profile analysis

Summary

Introduction

The extent of dislocation rearrangement during plastic deformation in face-centered cubic (FCC) metallic materials is affected by stacking fault energy (SFE) and solute elements interaction [1,2,3]. Dislocation density ρ can be evaluated using X-ray diffraction (XRD) line-profile analysis [6,7,8,9,10,11,12,13]. The dislocation states and substructures can be deduced from the value of M, which comprise Re. In this study, the multiplication and rearrangement of dislocations in FCC metals during tensile deformation was evaluated using XRD line-profile analysis. The effect of grain size, SFE, and solute elements on the extent of dislocation rearrangement was evaluated by variations in M during tensile deformation. The relationship between M variables and dislocation substructures was investigated

Materials and Methods

Effects of Solute Elements on the Variation in M Values

Conclusions