Abstract
The investigation was performed on pulse-electrodeposited Nickel with submicrocrystalline microstructure containing slightly elongated grains having a <110> fibre texture in growth direction. Structural units in form of groups of elongated grains possessing a common <110>-zone axis in growth direction and CSL boundaries (in some cases twins) between them have been found in the microstructure by use of EBSD. Grain growth sets in above 325°C but the texture is conserved up to at least 600°C. This means that the arrangement of twins and other CSL boundaries stabilized the structural units; there is no orientation change (by further twinning) when grain growth occurs as seen in previous studies on Ni and Ni-Fe of different initial texture. The observed structural units were characterized in detail and the occurring grains and grain boundaries are described.
Highlights
Materials with nano- and sub-microcrystalline grain sizes have been intensively studied due to their potential in high strength applications and as wear resistant coatings
Double fibre textures have been observed in Ni and Ni-base alloys in the presence of additives: a double fibre texture was found for Ni with 10 and 20 nm grain size and a sulphur content of 1580 ppm and 1200 ppm, respectively [8], and a double fibre texture was observed in Ni and Ni-Fe electrodeposits by using X-ray diffraction and by performing measurements using electron backscatter diffraction (EBSD) technique [9]
The onset of the low-energy exotherm was at 325°C instead of 84°C, while the heat release peak was with 395°C more than 100 degrees higher than in the Nickel material with 20 nm grain size (289°C) [19]
Summary
Materials with nano- and sub-microcrystalline grain sizes have been intensively studied due to their potential in high strength applications and as wear resistant coatings. Common to the grains in 5-fold twins and low-Σ structural units is a -orientation parallel to GD.
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