Ti对铸态AB5型合金微观结构与性能的影响

Effect of Ti on the Microstructure and Properties of the AB_5-type Cast Alloy

摘要:

研究了铸态ＭｌＮｉ３．８Ｃｏ０．６Ｍｎ０．５５Ｔｉ０．０５合金的电化学及其显微结构。结果表明，该合金有较好的初始活化性能和较高的低倍率放电容量，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

Abstract:

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.