含陶瓷微球复合泡沫镁的发泡行为控制与性能调控机理研究

本项目以含空心陶瓷微球（Ceramic Microsphere,CM）复合泡沫镁制备过程中的实际问题为出发点，拟通过研究新生Mg2Si相的产生和长大过程以及微观结构变化来分析CM对复合泡沫镁发泡行为（孔径均匀性和孔隙率）的影响机理；通过研究CM对基体材料力学性能的影响和CM在压缩变形过程中的受力情况与失效形式，找到其改变复合泡沫镁压缩断裂行为的原因；并以此为基础制备高孔隙率、孔径均匀、高强度且压缩变形过程呈塑性断裂的复合泡沫镁；通过研究CM与镁合金基体之间的界面关系，构建能够真实反应复合泡沫镁宏观结构和微观界面结合情况的三维模型，并准确预测其力学性能；通过研究铸态和T6热处理状态下复合泡沫镁在不同环境下的耐腐蚀性能，探究CM的作用机理；通过力学和耐蚀性能分析，综合评价复合泡沫镁作为汽车结构材料应用的可行性。

The generation, growth process and microstructure variation of Mg2Si will be investigated to analyze the influence mechanism on the foaming behavior of magnesium composite foam, using ceramic microspheres (CM) and AZ31B as the matrix. The reasons about the effect of CM on the deformation mode of composite foams will be studied and the effect of CM on the mechanical properties of the matrix will be investigated. Meanwhile, the forces and failure mode of CM during compression process will also be included. Based on this high porosity composite foams with homogeneous pore size and high strength will be prepared. Besides, the composite foams with ductile fracture will be obtained. The interface relationship between CM and magnesium matrix will be investigated for the establishment of the mathematical model of the composite foams, which can forecast the mechanical property of the foams accurately. Additionally, the corrosion resistance of the foams under as-casting and T6 heat treatment conditions will be evaluated. In addition, the functional mechanism of CM will be explored. Through the mechanical and corrosion resistance experiments mentioned above, the comprehensive assessment results will be obtained, which are significant for the application of the foams as automobile structural materials.