新型金属间化合物多孔材料弹性性能及变形机制研究

Due to its internal atoms bond together covalently and metal binding, intermetallic porous material combines advantages over the ceramics and metals, and becomes an excellent functional material and a high-temperature high-strength lightweight structural material, which has potential applications on aspects of filtration, welding, purification and biological materials, therefore it is important study on its mechanical properties that rarely has been reported previously at home and abroad currently. The project intends to establish the theoretical model of intermetallic porous material and obtain the theoretical formula of macroscopic elastic constants by macroscopic-mesoscopic analysis, furthermore, the correctness of the formula are verified through mechanical tests and its deformation mechanisms and microscopic fracture mechanism are explored. Meanwhile, the random model is constructed by self-made calculation program, then uniaxial tensile is developed to analyze the mechanical properties though the secondary development platform of the FEA and the influence law of porosity and pore structure on macroscopic elastic properties is revealed, which provide important theoretical basis on development and application of this new intermetallic porous materials.

金属间化合物多孔材料由于其原子内部以共价键和金属键共同结合，故兼有陶瓷和金属的共同优点，是一种优异的功能材料和轻质高温高强结构材料，在过滤、焊接、净化和生物材料等方面均有广阔的应用前景，因此对其力学性能研究具有重要意义，目前国内外的相关研究鲜有报道。本项目拟通过建立一个金属间化合物多孔材料孔隙结构的理论分析模型，利用宏细观分析给出其宏观弹性常数的理论计算公式，且通过实验验证该公式的正确性，并探讨其变形机制和微观断裂机理。同时自编计算程序构建随机孔隙模型，利用有限元二次开发平台模拟单轴拉伸实验开展力学性能分析，揭示多孔材料的孔隙率和孔隙结构特征对其宏观弹性性能的影响规律，为这一类新型金属间化合物多孔材料的研发与应用提供重要的理论依据。