锆合金第二相研究述评(Ⅱ):Zr-Sn-Nb-Fe系合金

摘要

对国内外关于Zr-Sn-Nb-Fe系新锆合金中第二相粒子的研究情况进行评述,并重点探讨不同种类Zr-Nb-Fe 析出相的成分、晶体结构及其形成机制和条件.合金中的Zr-Nb-Fe析出相有两种:一种为六方结构的MgZn2型Zr(Nb,Fe)2 Laves相,其形成与合金中作为杂质存在的Cr元素有关:另一种为立方结构的Ti2Ni型(Zr,Nb)2Fe相,与合金中普遍含有的O元素有关.对大量不同成分的Zr-Sn-Nb-Fe系合金的检测证实,可以用一个由合金中Nb 和Fe含量确定的R(·)参数来分析其成分变化时合金中可能出现的析出相类型.%The investigations of the second phase particles (SPPs) in Zr-Sn-Nb-Fe new zirconium alloys at home and abroad were reviewed, paying close attention to the composition, crystallographic structure and formation mechanism and condition of various Zr-Nb-Fe SPPs. There are two types of Zr-Nb-Fe SPPs: one is C14 (HCP, MgZn2) Zr(Nb, Fe)2 whose formation relates to the impurity element of Cr, and the other is CI5 (FCC, Ti2Ni) (Zr, Nb)2Fe particle for which oxygen plays a very important role. The examination to large mounts of Zr-Sn-Nb-Fe alloys with various compositions testifies that a parameter,, which is determined by Nb and Fe contents, can be successfully used to deduce which types of SPPs will mainly present when changing alloy compositions.