论文部分内容阅读
研究了Mn、V部分替代ZrCr0.7Ni1.3合金中的Cr元素后对其相组成、晶格常数和电化学容量等方面的影响.结果表明:母体合金的主相由立方C15型Laves相和少量六方C14型Laves相组成并含有少量第二相Zr7Ni10.对于合金ZrCr0.7-xMxNi1.3(x=0.1~0.6)(M=Mn或V),在Mn、V单独替代时,随着Mn替代量的增加,第二相Zr7Ni10峰逐渐减弱,合金电化学容量先增加后降低,在x=0.2时放电容量最大;随着V含量的增加,合金的主相向C14型Laves相转化,而第二相Zr7Ni10峰消失,并出现新的第二相Zr9Ni11衍射峰,合金的电化学容量迅速降低;当Mn、V同时进行替代时,对于合金ZrCr0.7-x-yMnxVyNi1.3(x+y=0.2~0.4),其相组成和晶格常数的变化不大,但电化学容量却有较大变化,当合金成分为ZrCr0.4Mn0.1V0.2Ni1.3时,放电容量最高,为311mA·h/g.
The effects of partial substitution of Mn and V for Cr in ZrCr0.7Ni1.3 alloy on its phase composition, lattice constant and electrochemical capacity were studied.The results show that the main phase of the parent alloy consists of cubic C15 Laves phase and A small amount of hexagonal C14 Laves phase and a small amount of second phase Zr7Ni10. With ZrCr0.7-xMxNi1.3 (x = 0.1-0.6) (M = Mn or V) The Zr7Ni10 peak of the second phase decreases gradually and the electrochemical capacity of the alloy first increases and then decreases, and the discharge capacity reaches the maximum at x = 0.2. With the increase of V content, the main phase of the alloy transforms to the C14 Laves phase, while the The Zr7Ni10 peak of the second phase disappears and a new Zr9Ni11 diffraction peak of the second phase appears, the electrochemical capacity of the alloy rapidly decreases. When Mn and V are replaced at the same time, the ZrCr0.7-x-yMnxVyNi1.3 (x + y = 0.2 ~ 0.4). The phase composition and lattice constant change little, but the electrochemical capacity has a great change. When the alloy composition is ZrCr0.4Mn0.1V0.2Ni1.3, the discharge capacity is the highest, which is 311mA · h / g.