【摘要】 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.更多还原

【Abstract】 Mg_1.75Al_0.25Ni_1-xCr_x（0 ≤x≤ 0.2） alloys were synthesized by diffusing method（DM） on the basis of the ternary Mg_1.75Al_0.25Ni alloy.The X-ray diffraction showed that the structure of the Cr-partially-substituted alloy did not differ from that of Mg_1.75Al_0.25Ni alloy but there was a change in the lattice parameter.It was found that the Cr-substituted alloys showed enhanced discharge capacities.The cycle life of the alloys was（improved） when x（Cr） reached 0.1. The anti-corrosion order was Mg_1.75Al_0.25Ni_0.9Cr_0.1>Mg_1.75Al_0.25Ni>Mg_1.75Al_0.25Ni_0.8Cr_0.2>Mg₂Ni.The result of the charge-discharge experiment also supported the conclusion.The structure and the component of alloy phase were changed after ball milling but the discharge capacity of the Mg_1.75Al_0.25Ni_0.9Cr_0.1 alloy was not enhanced.更多还原