Zr-Nb合金调幅分解组织的研究
发布时间：2019-01-26 12:11
【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。
[Abstract]:Based on the thermodynamic parameters of bcc phase in Zr-Nb alloy system reported in the literature, the temperature and composition range of amplitude modulation decomposition of zirconium and niobium alloy in Zr-Nb phase diagram were calculated. Then the (XRD), was diffracted by X-ray diffraction. Scanning electron microscope (SEM), (SEM), transmission electron microscope (TEM), and other experimental methods were used to verify the partial composition of Zr-Nb alloy. In the process of the experiment, the zirconium and niobium alloys with different compositions need to be heated in the 尾 single phase region for solution treatment, and a single bcc phase is obtained, and then the aging treatment is carried out at the predicted amplitude modulation decomposition temperature. The results show that the amplitude modulation decomposition of Zr-0.35Nb,Zr-0.4Nb and Zr-0.45Nb alloys at different temperatures occurs in the initial stage of heat preservation, indicating that the amplitude modulation decomposition occurs in the initial phase transformation. The higher the amplitude modulation decomposition temperature, the faster the transition occurs; the amplitude modulation decomposition first occurs at the grain boundary and gradually changes to the crystal, and the obtained microstructure is in good agreement with the predicted amplitude modulation decomposition structure.
【作者单位】： 北京科技大学材料科学与工程学院;
【基金】：国家自然科学基金项目(51671025) 国家科技部重点研发计划项目(2016YFB0701401)资助
【分类号】：TG146.414
，
本文编号：2415466
[Abstract]:Based on the thermodynamic parameters of bcc phase in Zr-Nb alloy system reported in the literature, the temperature and composition range of amplitude modulation decomposition of zirconium and niobium alloy in Zr-Nb phase diagram were calculated. Then the (XRD), was diffracted by X-ray diffraction. Scanning electron microscope (SEM), (SEM), transmission electron microscope (TEM), and other experimental methods were used to verify the partial composition of Zr-Nb alloy. In the process of the experiment, the zirconium and niobium alloys with different compositions need to be heated in the 尾 single phase region for solution treatment, and a single bcc phase is obtained, and then the aging treatment is carried out at the predicted amplitude modulation decomposition temperature. The results show that the amplitude modulation decomposition of Zr-0.35Nb,Zr-0.4Nb and Zr-0.45Nb alloys at different temperatures occurs in the initial stage of heat preservation, indicating that the amplitude modulation decomposition occurs in the initial phase transformation. The higher the amplitude modulation decomposition temperature, the faster the transition occurs; the amplitude modulation decomposition first occurs at the grain boundary and gradually changes to the crystal, and the obtained microstructure is in good agreement with the predicted amplitude modulation decomposition structure.
【作者单位】： 北京科技大学材料科学与工程学院;
【基金】：国家自然科学基金项目(51671025) 国家科技部重点研发计划项目(2016YFB0701401)资助
【分类号】：TG146.414
，
本文编号：2415466
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