Hydrogen storage performance and phase transformations in as-cast and extruded Mg-Ni-Gd-Y-Zn-Cu alloys
Hydrogen storage performance and phase transformations in as-cast and extruded Mg-Ni-Gd-Y-Zn-Cu alloys
复制标题
铸态和挤压 Mg-Ni-Gd-Y-Zn-Cu 合金的储氢性能和相变
DOI：
10.1016/j.jmst.2022.12.015
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发表时间：
2023-02
期刊：
影响因子：
--
通讯作者：
Qian Li
中科院分区：
文献类型：
--
作者：
Hu Yao;Guang Zeng;Xin F. Tan;Qinfen Gu;Kazuhiro Nogita;Jing Guo;Qian Li
镁基材料的热机械加工是调节储氢性能的有效方法。在这项研究中，Mg-Ni-Gd-Y-Zn-Cu 合金是通过直接冷铸（DC）铸造（采用或不采用挤压工艺）制备的。利用分析电子显微镜和原位同步加速器粉末X射线衍射技术，全面探讨了直流铸造和热机械加工引入的微观组织演变对Mg-Ni-Gd-Y-Zn-Cu合金储氢性能的影响。结果表明，挤压合金具有更高的吸氢能力和更快的吸氢/解吸动力学。经过挤压加工后，显微组织中的α-Mg晶粒显着细化，并且α-Mg基体上出现了大量的14H型长周期堆叠有序（LPSO）相。活化后，纳米级氢化Gd/Mg2Ni金属间化合物增多，切屑更细。这些修饰协同增强了储氢性能。该研究结果对镁基储氢材料的合金设计和制造具有重要意义，该材料具有快速批量生产和抗氧化的优点。
Thermal-mechanical processing of magnesium-based materials is an effective method to tailor the hydrogen storage performance. In this study, Mg-Ni-Gd-Y-Zn-Cu alloys were prepared by Direct Chill (DC) casting, with and without extrusion process. The influences of microstructure evolution, introduced by DC casting and thermal-mechanical processing, on the hydrogen storage performance of Mg-Ni-Gd-Y-Zn-Cu alloys were comprehensively explored, using analytical electron microscopy andin-situsynchrotron powder X-ray diffraction. The result shows that the extruded alloy yields higher hydrogen absorption capacity and faster hydrogen ab/desorption kinetics. As subjected to extrusion processing, the α-Mg grains in the microstructure were significantly refined and a large number of 14H type long-period stacking ordered (LPSO) phases appeared on the α-Mg matrix. After activation, there were more nanosized Gd hydride/Mg2Ni intermetallics and finer chips. These modifications synergistically enhance the hydrogen storage properties. The findings have implications for the alloy design and manufacturing of magnesium-based hydrogen storage materials with the advantages of rapid mass production and anti-oxidation.
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