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为了改善Mg2Ni型合金的贮氢性能,用Mn部分替代合金中的Ni,并采用快淬工艺制备Mg20Ni10-xMnx(x=0, 1, 2, 3, 4)合金。用XRD和HRTEM分析了铸态及快淬合金的微观结构,用自动控制Sieverts设备测试合金的吸放氢动力学,并采用程控电池测试仪测试合金的电化学性能。结果表明,当淬速为20 m/s时,快淬(x=4)合金中出现非晶相,且非晶化程度随淬速的增加而增加。合金的吸放氢量及动力学性能随淬速的增加而增加。此外,快淬显著地改善了合金的电化学性能,包括放电容量及含Mn合金的循环稳定性。
In order to improve the hydrogen storage properties of Mg2Ni alloy, part of Mn was replaced by Mn, and Mg20Ni10-xMnx (x = 0, 1, 2, 3, 4) alloys were prepared by rapid quenching. The microstructures of as-cast and quenched alloys were analyzed by XRD and HRTEM. The kinetics of hydrogen absorption and desorption was tested by using Sieverts apparatus. The electrochemical performance of the alloy was tested by a programmed cell tester. The results show that when the quenching speed is 20 m / s, the amorphous phase appears in the quenched (x = 4) alloy, and the degree of amorphization increases with the increase of quenching rate. Hydrogen absorption and desorption of hydrogen and kinetics of the alloy increases with increasing quenching rate. In addition, quenching significantly improves the electrochemical performance of the alloy, including the discharge capacity and the cycling stability of Mn-containing alloys.