针对镁合金高温强度低，室温加工性差的问题，本项目利用过渡元素合金化调控LPSO相的微结构，构建新型耐热的LPSO相，协调其与合金的变形行为，为同时提高镁合金耐热及室温加工性能打开新视野。围绕“微结构—热稳定性—变形行为”关系，首先研究过渡元素对LPSO相微结构的影响规律，并揭示其作用机制及调控机理，实现含新型LPSO相合金的可控制备；其次，探讨LPSO相微结构对其热稳定的影响规律及作用机理，建立相微结构与热稳定性的关联；最后，分别对LPSO相及合金的力学行为进行研究，揭示LPSO相微结构对其变形行为的影响规律，并阐明其增韧机理，为镁合金的强韧化理论增添新内涵，同时为开发高强耐热的变形镁合金提供新策略和新方法。

Based on the engineering problems of low high-temperature strength and poor room-temperature ductility of Mg alloys, in this project, a new heat-resistant LPSO phase is constructed by alloying of transition elements, which could effectively accommodate deformation of Mg alloys. This will open up new horizons for Mg alloys with the LPSO phase to simultaneously improve heat resistance and room temperature processing performance. Centering on the relationship of “microstructure–thermal stability–deformation behavior”, firstly, the influence of transition element on the microstructure of LPSO phase is investigated and mechanisms of action and adjustment are explored to realize the preparation of alloy with a new LPSO phase. Secondly, the effect of microstructure of LPSO phase on thermal stability is investigated to establish their corresponding correlations. Finally, combined with mechanical behavior of LPSO phase and alloy, the influence of microstucture of LPSO phase on deformation behavior is investigated and the toughening mechanism are clarified. This can add new connotation to the strengthening and toughening theory of Mg alloy and provide a new strategy and method for the development of wrought Mg alloy having high strength and heat resistance.