Zr-Nb合金调幅分解组织的研究
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摘要
首先借助文献中报道的Zr-Nb合金体系中bcc相的热力学参数计算了Zr-Nb相图中处于混溶间隙内部的锆铌合金发生调幅分解的温度以及成分区间,然后通过X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)等实验方法对部分成分的Zr-Nb合金进行验证。在实验过程中,首先不同成分锆铌合金均需在β单相区保温进行固溶处理,得到单一的bcc相,然后在预测的调幅分解温度下进行时效处理。研究结果表明,Zr-0.35Nb,Zr-0.4Nb和Zr-0.45Nb合金在不同温度下保温时,均在保温初期发生了调幅分解,表明调幅分解发生在相变初期;调幅分解温度越高,转变发生越迅速;调幅分解首先发生在晶界处,并逐渐向晶内转变;得到的组织与预测的调幅分解组织吻合较好。
The spinodal decomposition temperature and composition range of zirconium-niobium alloy were firstly calculated through thermodynamic data of bcc phase reported in the literature of Zr-Nb alloy system. Subsequently,the microstructure of different compositions of Zr-Nb alloys was validated by X-ray diffraction( XRD),scanning electron microscopy( SEM),transmission electron microscopy( TEM) etc. During the experiments,different compositions Zr-Nb alloys were heated in β phase region firstly to acquire a single bcc phase,and then aged at spinodal decomposition temperature determined by previous calculation. The results showed that the spinodal decomposition occurred in early heating time when Zr-0. 35 Nb,Zr-0. 4Nb and Zr-0. 45 Nb alloys were heated at different temperatures,which indicated that the spinodal decomposition occurred at the early stage of transformation; when the spinodal decomposition temperature was higher,the transformation occurred more rapidly; spinodal decomposition firstly occurred at grain boundaries,and gradually transformed into the grain inside; the predicted spinodal decomposition microstructure was obtained when the samples were treated at the calculated spinodal decomposition temperatures and compositions ranges.
The spinodal decomposition temperature and composition range of zirconium-niobium alloy were firstly calculated through thermodynamic data of bcc phase reported in the literature of Zr-Nb alloy system. Subsequently,the microstructure of different compositions of Zr-Nb alloys was validated by X-ray diffraction( XRD),scanning electron microscopy( SEM),transmission electron microscopy( TEM) etc. During the experiments,different compositions Zr-Nb alloys were heated in β phase region firstly to acquire a single bcc phase,and then aged at spinodal decomposition temperature determined by previous calculation. The results showed that the spinodal decomposition occurred in early heating time when Zr-0. 35 Nb,Zr-0. 4Nb and Zr-0. 45 Nb alloys were heated at different temperatures,which indicated that the spinodal decomposition occurred at the early stage of transformation; when the spinodal decomposition temperature was higher,the transformation occurred more rapidly; spinodal decomposition firstly occurred at grain boundaries,and gradually transformed into the grain inside; the predicted spinodal decomposition microstructure was obtained when the samples were treated at the calculated spinodal decomposition temperatures and compositions ranges.
引文
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[2]Minato K,Akabori M,Takano M,Arai Y,Nakajima K,Itoh A,Ogawa T.Fabrication of nitride fuels for transmutation of minor actinides[J].Journal of Nuclear Materials,2003,320:18.
[3]Li W D.The Introduction of Nuclear Materials[M].Beijing:Chemical Industry Press,2007.1.(李文埮.核材料导论[M].北京:化学工业出版社,2007.1.)
[4]Olander D.Nuclear fuels-present and future[J].Journal of Nuclear Materials,2009,389:1.
[5]Huang C L.Investigation on the Preparation,Structure,Properties of Zr-Based Nuclear Material[D].Nanjing:Nanjing University of Aeronautics and Astronautics,2013.5.(黄才龙.Zr基核材料的制备工艺、结构和性能研究[D].南京:南京航空航天大学,2013.5.)
[6]Liu J Z,Zhao W J,Xue X Y.Nuclear Structural Material[M].Beijing:Chemical Industry Press,2007.5.(刘建章,赵文金,薛祥义.核结构材料[M].北京:化学工业出版社,2007.5.)
[7]Cox B.Some thoughts on the mechanisms of in-reactor corrosion of zirconium alloys[J].Journal of Nuclear Materials,2005,336(2):331.
[8]Oka Y,Koshizuka S.Supercritical-pressure,oncethrough cycle light water cooled reactor concept[J].Journal of Nuclear Science and Technology,2001,38(12):1081.
[9]Motta A T,Yilmazbayhan A,da Silva M J G,Comstock R J,Was G S,Busby J T,Gartner E,Peng Q J,Jeong Y H,Park J Y.Zirconium alloys for supercritical water reactor applications:challenges and possibilities[J].Journal of Nuclear Materials,2007,371(1):61.
[10]Guillermet A F.Thermodynamic analysis of the stable phase in the Zr-Nb system and calculation of the phase diagram[J].Z.Metallkd,1991,82(6):478.
[11]Wei Y H,Hu L Q,Huang Y,Wang X T.Characteristics of spinodal decomposition in Cu-Ti alloy[J].Transactions of Materials and Heat Treatment,1997,18(2):9.(卫英慧,胡兰青,黄源,王笑天.铜钛合金调幅分解之特征[J].材料热处理学报,1997,18(2):9.)
[12]Toda Y,Nakagawa H,Koyama T,Miyazaki T.An analysis of the phase decomposition in Nb-Zr alloy based on the system free energy theory[J].Materials Science and Engineering,1998,A255(1):90.
[13]Shen K,Yin Z M,Wang T.On spinodal decomposition in ageing 7055 aluminum alloys[J].Materials Science and Engineering.2008,A477(1):395.
[14]Wang J,Zou H,Li C,Qiu S Y,Shen B L.The spinodal decomposition in 17-4PH stainless steel subjected to long-term aging at 350℃[J].Materials Characterization,2008,59(5):587.
[15]Sheibani S,Heshmati-Manesh S,Ataie A,Caballero A,Criado J M.Spinodal decomposition and precipitation in Cu-Cr nanocomposite[J].Journal of Alloys and Compounds.2014,587(2):670.
[16]Yang Z N.Investigation on the Control of Microstructure and Mechanical Properties of Deformed Zr-Nb Alloy[D].Qinhuangdao:Yanshan University,2013.25.(杨志南.变形Zr-Nb合金组织与性能调控研究[D].秦皇岛:燕山大学,2013.25.)