GRATN GROWTH IN NANOCRYSTALLINE IRON PREPARED BY MECHANICAL ATTRITION

摘要

The grain growth in nanocrystalline Fe produced by high energy ball milling is investigated. Grain growth data are analysed using two different models of grain growth, one of which takes pinning Forces on the grain boundaries into account. The grain growth exponents n from D~l - D~l =kt for Nanocrystalline and conventional polycrystalling Fe are compared. The use of the above mentioned Equation yields an activation energy of 125 kJ/mol, while the second model gives 248kJ/mol.