[SY-E2] Symposium E-2

[SY-E2] Tailoring the stability of {10-12} twin in magnesium with solute segregation at the twin boundary and strain path control

Heyu Zhu, ^○Ziran Liu (Dept. of Phyiscs, Hunan Normal University, Changsha, Hunan, China)

{10-12} twinning in magnesium is commonly activated at the room temperature under mechanical loading to accommodate arbitrary deformation. Effect of solute segregation at twinning boundary on the stability of {10-12} twinning which is dependent on the strain path was investigated by employing first-principles calculations. A model of simulating twinning under external stress is proposed to predict the stability of twinning with solid solutes under strains. The calculations reveal that the stability of {10-12} twinning could be tailored by applying external stress on twinning with or without solid solutes at boundary. The modeling well match the previous experimental results. Effective solute could be selected based on the electron work function to substitute a certain position along the {10-12} twinning boundary in order to stabilize the twinning.
Reference:
1. Z.R. Liu, D.Y. Li, Acta Materialia 2015;89:225.
2. Z.R. Liu, D.Y. Li, Computational Materials Science 2015;103:90.
3. H. Zhu, Z. R. Liu, Submitted to Computational Materials Science, 2018.