|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Magnesium Technology 2017
||Zinc Segregation on Interfaces Induced by Severe Plastic Deformation of an Mg-Zn-Y Alloy at Room Temperature
||D. Althaf Basha, Ryoji Sahara, Hidetoshi Somekawa, Julian Rosalie, Alok Singh, Koichi Tsuchiya
|On-Site Speaker (Planned)
Interfacial segregation has significant effect on the microstructural stability and mechanical properties of an alloy. Here we show interfacial segregation induced by severe plastic deformation (SPD) at room temperature (RT). A Mg-3Zn-0.5Y (at%) alloy in a rolled condition was subjected to high pressure torsion (HPT) by application of 5 GPa load and torsional strain at RT. The microstructure was studied by TEM and STEM. Segregation of zinc was observed on all newly formed interfaces - twins formed by compressive load alone, low angle boundaries formed under torsion, and grain boundaries formed by recrystallization. It is shown by First principles calculations that Zn atoms prefer to segregate to dislocations on low angle boundaries. It is estimated that Zn atoms are transported by SPD induced vacancy flux at RT.