An EBSP study of isothermally‐annealed cold‐rolled nickel

Abstract

Scanning electron microscopy and electron backscattered patterns, EBSP, have been employed to reveal both the grain structure and texture of 90% cold-rolled polycrystalline nickel after 1-hour anneals at a variety of temperatures. After annealing at either 400 degrees or 500 degrees C, small, cube-oriented, equi-axed grains were produced via primary recrystallization. At 600 degrees C, large [124]<211> oriented grains accounted for an increasing proportion of the microstructure, until at 1000 degrees C only large grains ( approximately 600 microm) and a sharp [124]<211> texture were present. Detailed EBSP analyses of the grain boundaries surrounding the large abnormally grown grains observed at 600 degrees C demonstrated that formation of the secondary recrystallization texture was due to migration of high-mobility, random high-angle boundaries around grains that had a size advantage, consistent with the Abbruzzese-Lücke model.

Effects of Degree of Deformation and Deformation Temperature on Primary Recrystallization Textures in Polycrystalline Nickel

“…A previous study [4,5] on the directional recrystallization of 90 pct cold-rolled, 99.5 wt pct purity, polycrystalline nickel suggested that a strong primary recrystallization texture-for nickel, the cube texture-is necessary for growing single crystals or columnar grains upon directional annealing at secondary recrystallization temperatures. The growth mechanism of the columnar grains or single crystals was also discussed.…”

Cyclic deformation of nanocrystalline and ultrafine-grained nickel

“…CG Ni foils with commercial purity were purchased from Alfa Aesar. Since the as-received CG Ni was cold rolled, recrystallization annealing was preformed at 450°C for 3 h [27]. In situ neutron diffraction with a time-of-flight method was conducted using SMARTS hydraulic load-frame at Los Alamos Neutron Science Center.…”

Near-grain-boundary characterization by atomic force microscopy

“…Grainboundary texture is a subject of study for a number of researchers. In the view of the present work, few important aspects can be noted from the results of Baker and Li [14]. In this paper, the authors have summarized results obtained by different researchers.…”

“…The /111S or /10 0S preferential rotation direction can be controlled by rolling procedure. Makita et al [16] and other workers [14] have emphasized the role of CSL that CSL boundaries around large grains have higher mobility than other boundaries. They have also noted {11 0} /11 2S orientation relationship and explained it as related to twin orientation.…”

“…In primary recrystallization, the cubic texture in FCC materials gets sharpened and strengthened by increasing the annealing temperature and time [14]. Lejček and Šíma [15] have noted secondary crystallization being activated at temperatures greater than the critical temperature of 777 1C for 90% cold-rolled nickel.…”