锆合金第二相研究述评(Ⅰ):Zircaloys合金  

Review of second phase particles on zirconium alloys(Ⅰ): Zircaloys

作　　者：柴林江[1] 栾佰峰[1] 周宇[1] 邱日盛[1] 陈建伟[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《中国有色金属学报》2012年第6期1594-1604,共11页The Chinese Journal of Nonferrous Metals

基　　金：中央高校基本科研业务费专项资金资助项目(CDJZR10130008;CDJXS10132201);教育部新世纪优秀人才支持计划资助项目(NCET-08-0606)

摘　　要：回顾了国内外近几十年来关于Zircaloys合金中第二相粒子本征特征(晶体结构、成分、形状、亚结构等)的相关研究工作。Zircaloys合金中的Zr-Fe-Ni粒子只有一种,即C16(BCT,Al2Cu)型Zr2(Fe,Ni)Zintl相。而Zr-Fe-Cr粒子主要有两种:一种是C14(HCP,MgZn2)型Zr(Fe,Cr)2Laves相,另一种是C15(FCC,MgCu2)型Zr(Fe,Cr)2Laves相,这些Laves相内部均可见层错结构。归纳总结出形成温度决定论、n(Fe)/n(Cr)决定论、价电子/原子比决定论3种理论,用于解释Zr(Fe,Cr)2粒子形成稳定结构的原因。常规加工工艺下,在Zircaloys合金成分范围内,Sn完全固溶于α-Zr基体,不会参与形成析出相,Fe、Cr、Ni一般也不会单独与Zr形成Zr-Fe、Zr-Cr、Zr-Ni粒子。In the recent decades the investigations about intrinsic characteristics （crystallographic structure, microchemistries, shape, substructure, etc.） of the second phase particles （SPPs） that might present in Zirclaoys were thoroughly reviewed. Some research experiences and approaches which would be of great help to the SPPs investigations for new-developed high-performance zirconium alloys are obtained. It can be summarized that in Zircaloys there is only one kind of Zr-Fe-Ni SPPs, i.e. C16 （BCT, A12Cu） Zr2（Fe, Ni） Zintl phase. While for the Zr-Fe-Cr Laves SPPs in zircaloys, there are two variants. One is C14 （HCP, MgZn2） Zr（Fe, Cr）2 and the other is Laves phase with C15 （FCC, MgCu2） structure. Stacking faults were frequently observed by researchers in those Zr（Fe, Cr）2 SPPs. Based on a large amount of studies, it is summarized that the formation temperature, n（Fe）/n（Cr） ratios or valence electron/atom ratios of SPPs are determinant factors in respect to the stable structures of Zr（Fe, Cr）2. In addition, the possibility of presence of Sn-bearing particles was discussed as well as Zr-Fe, Zr-Cr and Zr-Ni particles in Zircaloys under conventionally processing conditions.

关 键 词：Zircaloys合金 LAVES相 Zr-Fe-Ni粒子 Zr-Fe-Cr粒子 

分 类 号：TG146.4[一般工业技术—材料科学与工程]