摘要
研究了铸态MlNi3.8Co0.6Mn0.55Ti0.05合金的电化学性能及其显微结构。结果表明，该合金有较好的初始活化性能和较高的低估率放电容量，但高倍率放电能力和放电电压特性较差，循环稳定性也不甚理想。X射线衍射、扫描电镜及能谱分析表明：合金中存在第二甚至第三物相，主要为Ti（NiCoMn）相。该相有加快合金粉化速度、降低循环寿命的不良作用。制备合Ti合金要设法避免元素偏析才能充分发挥Ti的作用。
The electrochemical and microstructural properties of cast MlNi3. 8C0. 6Mn0.55Ti0.05 have been investigated in detail. The results show that the initial activation and the low-rate discharge capacity are promising, but the high-rate discharge capacity and the discharge voltage plateau are to be improved for this alloy. Segregation, mainly Ti(NiCoMn),was detected using in situ X-ray diffraction, scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDAX). Ti (NiCoMn) segregation makes the alloy easy to pulverize, and consequently decrease the cycle stability of the alloy. The segregation should be avoided to make the full use of Ti.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
1998年第6期352-355,共4页
Rare Metal Materials and Engineering
关键词
贮氢合金
电化学性能
微结构
钛
hydrogen-storage alloy, Ti, electrochemical property, microstructure
