(重慶大學(xué) 材料科學(xué)與工程學(xué)院，重慶 400044)
摘 要: 對(duì)國內(nèi)外關(guān)于Zr-Sn-Nb-Fe系新鋯合金中第二相粒子的研究情況進(jìn)行評(píng)述，并重點(diǎn)探討不同種類Zr-Nb-Fe析出相的成分、晶體結(jié)構(gòu)及其形成機(jī)制和條件。合金中的Zr-Nb-Fe析出相有兩種：一種為六方結(jié)構(gòu)的MgZn2型Zr(Nb, Fe)2 Laves相，其形成與合金中作為雜質(zhì)存在的Cr元素有關(guān)；另一種為立方結(jié)構(gòu)的Ti2Ni型(Zr, Nb)2Fe相，與合金中普遍含有的O元素有關(guān)。對(duì)大量不同成分的Zr-Sn-Nb-Fe系合金的檢測證實(shí)，可以用一個(gè)由合金中Nb和Fe含量確定的R*參數(shù)來分析其成分變化時(shí)合金中可能出現(xiàn)的析出相類型。
關(guān)鍵字: Zr-Sn-Nb-Fe新鋯合金；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
