(重庆大学 材料科学与工程学院，重庆 400044)
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。
关键字: Zr-Sn-Nb-Fe新锆合金；第二相；Zr(Nb, Fe)2；(Zr, Nb)2Fe
（College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China）
Abstract: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 C15 (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, R*, 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.
Key words: Zr-Sn-Nb-Fe alloys; second phase particles; Zr(Nb, Fe)2; (Zr, Nb)2Fe
