Morphology and chemical nanoanalysis of discontinuous precipitation in MgAl alloys—I. Regular growth

Discontinuous precipitation in MgAl alloys has been studied both by conventional TEM (morphology) and STEM with local chemical analysis (concentration profiles). Numerous growth defects have been identified. In the case of regular growth, a detailed analysis of concentration profiles using Cahn's solution has been performed, proving the necessity to introduce three velocity scales in order to describe the overall kinetics. The thermodynamical …