부산대학교 도서관

Nanocrystalline (NC) Ni electrodeposits (EDs) with a mean grain size of 34 ± 12 nm has been investigated, from roomtemperature to 800 °C under a purge gas of argon, by both non-isothermal and isothermal differential scanning calorimetrymeasurements, in combination with characterization of temperature-dependent microstructural evolution. A significant exothermicpeak resulting from superimposition of recrystallization and surface oxidation occurs between 340 and 745 °C at aheating rate of 10 °C/min for the NC Ni EDs. The temperatures for recrystallization and oxidation increase with increasingthe heating rate. In addition, recrystallization leads to a profound brittle–ductile transition of the Ni EDs in a narrow rangearound the peak temperature for the recrystallization.