快凝合金Zr（Ni0.55Mn0.3V0.1Cr0.05）2.1的相结构与储氢性能

在快冷（冷却速度１０＾５－１０＾６Ｋ／ｓ）Ｚｒ（Ｎｉ０．５５Ｍｎ０．３Ｖ０．１Ｃｒ０．０５）２．１合金中观察到一种高温条件下丰碑 纳米晶Ｃ１４Ｌａｖｅｓ相，其丰度随冷凝速度下降明显减少。

PHASE STRUCTURES AND HYDROGEN STORAGE PROPERTIES OF RAPIDLY SOLIDIFIED Zr(Ni_(0.55)Mn_(0.3) V_(0.1)Cr_(0.05))_(2.1) ALLOY

A nano-size C14 Laves phase, which exists only in high temperature, can be obtained byrapid solidification of molten alloy Zr(Ni0.55Mn0.3V0.1Cro0.05)2.1 using melt spinning method with coolingrate from 105 to 106 K/s. The abundance of nano-size C14 Laves decreases with decreajsing of cooling rate.XRD and TEM show that the size of this phase is 1 urn in c direction, and 3 urn in a and b directions. Whenthe cooling rate lowers to about 105 K/s, the nano--size C14 Laves transfers to C15 Laves phase which hasa crystallite size of about 54 urn. A larger size C14 Laves and non-Laves, Zr7M10 and Zr9M11, appearwhen the cooling rate lowers to the master alloy cooling condition. The nano-size C14 Laves phase notonly enhances the electrochemical cycle life of the rapidly solidified alloy, but also get more electrochemicalcapacity than the master alloy through adjusting the relative abundance of C15 and nano-- size C14 Lavesby means of changing the cooling rate.