Dislocation Distribution and Work-Hardening in Iron Single Crystals Extended in the [100] and the [110] Axes
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Iron single crystals with the [100] and [110] axes were extended at 23℃ and -78℃ and examined by transmission electron microscopy using thin foils cut parallel to lattice planes. In the initial state of deformation, screw dislocations and edge type loops were observed predominantly. Two-dimensional tangles of dislocations approximately parallel to the slip plane were observed in the further state of deformation in the both crystals deformed at 23℃ and in the [110] crystals deformed at -78℃. The relations between the flow stress τ and dislocation density ρ were analysed by the equation τ=τ_0+αGb√<ρ>. The value of α in the crystals which had uniform distribution of dislocations was larger than that in the crystals which had non-uniform distribution. These results suggest that the work-hardening at low temperature deformation is due mainly to forest dislocations.
- 社団法人日本物理学会の論文
- 1969-12-05
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