Fe-3%Si alloy single crystal samples with various tensile directions were deformed to strains of 0.25 to 0.65 and subsequently annealed. Necking occurred and work-hardening was very small in all tensile-deformed samples. After annealing, no recrystallized grain was formed. Fe-3%Si alloy single crystal sample of {111}͗112͘ orientation was lightly rolled to 25 % and subsequently annealed. Many recrystallized grains were formed in the rolled sample. The orientation of recrystallized grains formed at the rolled surface was totally different from the orientation of those formed in the interior of the sample. These results are discussed based on the tendency for cross-slip and the dislocation network model for nucleus of recrystallized grain.KEY WORDS: Fe-3%Si alloy; single crystal; deformation; recrystallization.lationship between deformation and recrystallization is expected in BCC metal single crystals. One major objective of the present study is to investigate deformation and annealing behaviors of single crystals of Fe-3%Si alloy with various tensile orientations. The other objective is to study the recrystallization in uniformly deformed Fe-3%Si alloy single crystal of {111}͗112͘ orientation deformed by light rolling. Experimental ProcedureSingle crystal samples were spark-cut from a coarsegrained Fe-3%Si alloy polycrystal prepared by JFE Steel Co. Ltd. The dimension of the gauge portion of the samples for tensile deformation was 4 mmϫ12 mmϫ2 mm in width, length and thickness. Four samples were prepared for tensile deformation. The tensile directions of the samples are plotted in a stereographic triangle in Fig. 1. Sample No. 4 had the same {111}͗112͘ orientation as the one in the proceeding paper.17) These samples were tensile-deformed at the strain rate of 5.6ϫ10Ϫ5 to 1.4ϫ10 Ϫ4 s Ϫ1, to strains of 0.25 to 0.65. The dimension of the sample for rolling was 4 mmϫ46 mmϫ2 mm in width, length and thickness. The initial orientation of the rolled sample is presented in Fig. 2. The normal direction (ND) of the rolled surface and the rolled direction (RD) were [111] and [211], respectively. In order to obtain uniform deformation, relatively light rolling of 25 % was applied. The deformed microstructure was examined using a scanning electron microscope (SEM JEOL JSM-6400). Orientation change associated with deformation was determined from electron channeling patterns (ECPs) taken with the SEM.The annealing was conducted for the tensile-deformed samples at 1 173 to 1 273 K for 180 to 780 s. The rolled sample was annealed at 873 K for 720 s. After annealing, orientation of RGs was determined from their ECPs. For the rolled sample, the rolled surface was removed by 0.25 mm to observe the formation of RGs in the interior of the sample. Results Tensile-deformed SamplesNominal stress-strain curves for the four tensile-deformed samples are presented in Fig. 3. In all samples, necking started from the early stage of plastic deformation. After the neck formation, plastic deformation proceeded mainly in the neck portion. Hence, ...

To study the relationship between slip morphology and recrystallization of body centered cubic metals, an Fe-3%Si alloy single crystal sample of f111gh112i orientation and a bicrystal sample having f111gh112i and f001gh110i component grains were deformed in tension and subsequently annealed. Both samples exhibited necking at the beginning of plastic deformation. The appearance of slip bands was totally different in the component grains of the bicrystal sample. Straight slip bands aligned along the traces of two {110} slip planes were observed in the f111gh112i grain. On the other hand, wavy slip bands accompanied by high-step cross-slip were observed in the f001gh110i grain. After annealing, the tensile-deformed single crystal sample did not recrystallize. In the bicrystal sample, recrystallized grains were formed only in the f111gh112i grain. The difficulty in recrystallization of tensile-deformed samples is discussed in relation to the tendency to cross-slip.