|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Solid State Precipitation
||Self-organization by Strain Accommodation in the Formation of Long-range Stacking Order Structure in Mg-RE-TM Alloys
||Tadashi Furuhara, Xinfu Gu
|On-Site Speaker (Planned)
Long range periodic stacking ordered (LPSO) structures in magnesium alloy consist of regular arrangements of four layer high fcc structural units separated by several layers of the Mg basal plane. The diplacive nature in hcp->fcc structural transformatio involves large transformation strain. This strain can be significantly accommodated by the combination of the structure units with different shears. In addition, the possible lowest elastic energy configuration in both R and H type of LPSO structure is obtained. For H type LPSO structure, the opposite shear directions (or Burgers vectors of the partial dislocations) are operated in nearest structural units, while all three types of shear directions are operated successively in the nearest structural units for R type LPSO structure. Cs-corrected HAADF STEM observation has confirmed that the lowerst energy configuation is actually formed for the 14H LPSO structure in a Mg-Zn-Gd alloy.
||Planned: Supplemental Proceedings volume