论文部分内容阅读
通过对高纯ＴｉＺｒ合金的高温氮化和高温退火制取了三相（Ｔｉ，Ｚｒ）Ｎ复合陶瓷。此结果不同于ＴｉＮ与ＺｒＮ仅形成单相ＦＣＣ结构无限固溶体的早期研究。应用Ｘ射线衍射（ＸＲＤ）、Ｘ射线能量散射（ＥＤＳ）及高分辨电子显微术（ＨＲＴＥＭ）等技术手段分析研究了该（Ｔ＿ｉ，Ｚｒ）Ｎ复合陶瓷的晶体结构和化学成份。Ｘ射线衍射分析研究确定了材料的相组成（三相，ＦＣＣ结构）及三相的晶格常数。微区化学成份分析给出各相中Ｔｉ与Ｚｒ的相对原子百分含量以及它们的金属元素含量的近似化学表达式。结合高分辨像的研究，最终确定出晶格常数最大的相富Ｚｒ，晶格常数居中的相Ｔｉ与Ｚｒ含量近似相等，而晶格常数最小的相富Ｔｉ。
Three-phase (Ti, Zr) N composite ceramics were prepared by high temperature nitriding and high temperature annealing of high purity TiZr alloy. This result is different from the earlier studies of TiN and ZrN forming only an infinite solid solution of a single-phase FCC structure. The crystal structure and chemical composition of the (T_i, Zr) N composite ceramics were analyzed by XRD, EDS and HRTEM techniques. X-ray diffraction analysis confirmed the phase composition of the material (three-phase, FCC structure) and three-phase lattice constant. The chemical composition analysis of the micro-regions gives the approximate chemical expressions of the relative atomic percentages of Ti and Zr in each phase and their metal element contents. Combined with the research of high resolution image, the phase rich Zr with the largest lattice constant is finally determined, while the phase with the same lattice constant is approximately equal to the Zr and the phase with the lowest lattice constant is rich with Ti.