针对目前高强镁合金强度塑性不易兼得的难题，申请人基于前期实验发现“含LPSO相镁合金在时效过程中强度塑性同时增加”的新现象，以Mg-RE-Zn合金为研究对象，通过引入能量观念，从界面迁移的角度入手重点研究含LPSO相镁合金“成分/工艺-畸变能-界面迁移-结构形态-变形行为-力学性能”之间的联系。项目通过合金元素和应变诱导等调控手段向特定晶面引入或改变畸变能（重点考虑层错能和晶面能），合理调控LPSO相的形核和生长等界面迁移行为，以此调控LPSO相的结构形态并影响其变形行为，结合第一性原理计算和先进电子显微学技术（原位TEM等），最终揭示LPSO相对镁合金强度和塑性的影响机制，为研发新型高强高韧镁合金提供理论指导。

This project takes aims at the contradictory of the strength and ductility in magnesium alloys. And it focuses on the researches about the new phenomenon which both the strength and plasticity could be enhanced during the aging behavior. Based on it, Mg-RE-Zn alloys which contains LPSO phase will be taken as the research objects and the energy will be considered. The relationship of “Component/Processing – Distortion Energy – Interface Migration Behavior – Microstructure – Deformation Behavior – Mechanical property” will be discussed by a new angle of the interface migration behavior. In this program, according to changing and introducing the distortion energy, such as stacking fault energy and crystal face energy, in specific crystal face by alloying and strain introducing, the interface migration behavior, including nucleation and growth, can be regulated. Then the structure and morphology of LPSO phase will be controlled, and the deformation behavior will be affected. Combined with the first-principle calculation and in situ method in TEM technology, we could develop the mechanism of strengthening and toughness in LPSO phase magnesium alloys. Finally, this project could supply some guidance for research and development of the high strength and high ductility magnesium alloys.