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用扩散烧结法制备了Mg1.75A l0.25N i1-xCrx(0≤x≤0.2)系列合金.XRD结构分析表明,用Cr部分替代Mg1.75A l0.25N i中的N i,合金的晶体结构并不发生改变,主相为具有立方Ti2N i结构的Mg3A lN i2相,只是其晶格常数a变大.Cr的替代提高了合金的放电容量,经过一个充放电循环后达到最大值.当x为0.1时,有利于提高合金电极的循环稳定性.测试4种合金阳极极化曲线发现,其腐蚀电位由正到负的顺序为Mg1.75A l0.25N i0.9Cr0.1>Mg1.75A l0.25N i>Mg1.75A l0.25N i0.8Cr0.2>Mg2N i,说明Mg1.75A l0.25N i0.9Cr0.1合金具有相对较好的抗腐蚀性.该系列合金循环稳定性结果也支持这一结论.用球磨方法改变合金性能,发现合金的相组成和相结构在球磨后均发生了变化,合金不再需要活化过程,但其放电容量并没有得到提高.
A series of Mg1.75A l0.25N i1-xCrx (0≤x≤0.2) alloys were prepared by diffusion sintering.The XRD analysis showed that the partial substitution of Cr for Ni in Mg1.75Al0.25N i, the crystal structure of the alloy And the main phase is Mg3AlNi2 phase with cubic Ti2Ni structure, but its lattice constant a becomes larger.The substitution of Cr increases the discharge capacity of the alloy and reaches a maximum value after a charge-discharge cycle When x Is 0.1, is conducive to improve the cycle stability of the alloy electrode.Analysis of four kinds of alloy anodic polarization curve found that the corrosion potential from positive to negative order Mg1.75A l0.25N i0.9Cr0.1> Mg1.75A l0 .25N i> Mg1.75A l0.25N i0.8Cr0.2> Mg2N i, indicating that Mg1.75A l0.25N i0.9Cr0.1 alloy has relatively good corrosion resistance. The alloy cycle stability results also support In conclusion, the ball-mill method was used to change the properties of the alloy, and the phase composition and phase structure of the alloy were all changed after ball milling. The activation of the alloy was not required, but the discharge capacity did not increase.