Pr3Al11对镁吸放氢过程中晶粒长大的阻碍作用及其改善性能的机制

针对镁基储氢材料存在的关键科学问题，在本人前期研究的基础上，本项目提出了研究Pr3Al11对镁吸放氢过程中晶粒长大的阻碍作用及其改善性能的机制这一课题。拟研究Pr3Al11纳米颗粒对纳米镁晶粒长大的影响规律，揭示该纳米颗粒对镁晶界钉扎作用的本质；探索吸放氢过程中Pr3Al11纳米颗粒对Mg和MgH2的作用机理，阐明Pr3Al11纳米颗粒改善镁吸放氢性能的原因；研究Pr3Al11纳米颗粒和其它催化相对镁吸放氢性能的综合效应，揭示催化相与Pr3Al11纳米颗粒对镁吸放氢的协同作用机制。通过这些研究工作，为高性能镁基合金的研究探索提供理论依据。

To solve some key scientific problems of Mg-based hydrogen storage materials, a research project about the inhibition effect of Pr3Al11 on grain growth of Mg during hydrogen absorption-desorption and mechanism of performance improvement is proposed on the basis of our previous investigations. The effect of Pr3Al11 nano-particles on grain growth behavior of Mg will be systemically studied to reveal the nature of pinning effect of nano-particles on grain boundaries of Mg. Then the effect mechanism of Pr3Al11 nano-particles on Mg and MgH2 during hydrogen absorption and desorption will be investigated and the reasons for hydrogen storage performance improvement will be clarified. Finally, the synergetic effect of Pr3Al11 nano-particles and catalytic phases on the hydrogen storage properties of Mg and corresponding mechanism will be studied. After all the investigations the key scientific problems of Mg-based materials can be solved, offering a theoretical foundation for the researches and developments of Mg-based hydrogen storage materials.