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研究了x(Zr)及热处理工艺对LaNi(4.2+5x)Mn0.4Al0.4Zrx储氢合金微观组织与电化学性能的影响.结果表明:添加Zr元素后该储氢合金中均出现Zr(Ni,Al,Mn)5第二相,并且第二相的含量随x的增大而增多.当x=0.4时,经热处理后合金中的第二相沿主相晶界呈网状分布,而且其韧性很好.由于第二相对主相起到了防腐蚀保护作用,并降低了充放电过程中晶格畸变引起的合金粉化的速度,从而使循环稳定性显著提高,但由于第二相不是吸氢相,对电化学容量没有贡献,因此它的出现使合金的放电容量降低.
The effects of x (Zr) and heat treatment on the microstructure and electrochemical properties of LaNi (4.2 + 5x) Mn0.4Al0.4Zrx hydrogen storage alloys were investigated. The results show that Zr (Ni , Al, Mn) 5, and the content of the second phase increases with the increase of x.When x = 0.4, the second phase in the alloy is distributed in a network along the grain boundary of the main phase after heat treatment, and its Good ductility.As the second relative to the main phase of the anti-corrosion protection and reduce the charge and discharge process lattice distortion caused by the rate of alloy powder, so that significantly improve the cycle stability, but the second phase is not a suction Hydrogen phase, does not contribute to the electrochemical capacity, so its appearance reduces the discharge capacity of the alloy.