HREM and HAADF Studies of Precipitates in the Mg-Y-Nd Alloy System
By means of high resolution transmission electron microscopy (HREM) and high-angle annular dark-field image technique (HAADF), morphological, structural and compositional characteristics of the precipitates in the Mg-4Y-3Nd alloy aged at 200°C for different periods of time have been studied. On the basis of HREM observations, an atomic structural model for the β’-precipitate with an orthorhombic unit cell has been proposed. The characteristic distribution of the precipitates which are rich in rare-earth elements (Y, Nd) has been clearly revealed by the HAADF imaging technique.
Young Won Chang, Nack J. Kim and Chong Soo Lee
W. Sun et al., "HREM and HAADF Studies of Precipitates in the Mg-Y-Nd Alloy System", Materials Science Forum, Vols. 561-565, pp. 275-278, 2007