Applications of Transient Liquid Bonding

用镍铝化物和钛铝化物作为模型系统，研究了控制金属间化合物在水溶液中的钝化和腐蚀的因素。利用键渗透理论对多晶金属材料的晶间分离进行了平行研究。模型材料可从工业中获得，也可以通过快速凝固，共溅射沉积或离子注入制备。通过扫描电子显微镜和x射线衍射表征其结构和组成，通过交流、直流电化学和溶液分析等多种技术表征其电化学性质。用于结构应用的新型结构金属间材料以及在微电子加工中形成的结构金属间材料的腐蚀和钝化机制尚不清楚。这项研究将阐明这些机制，并导致预测电化学性质的程序。＊＊＊

9357463 Scully Factors controlling the passivity and corrosion of intermetallic compounds in aqueous solutions are examined using nickel aluminides and titanium aluminides as model systems. A parallel investigation is pursued on intergranular separation in polycrystalline metallic materials using bond percolation theory. Model materials are available from industry and also can be prepared by rapid solidification, co-sputter deposition, or ion implantation. Structure and composition are characterized by scanning electron microscopy and X-ray diffraction and electrochemical properties characterized by several techniques, including AC and DC electrochemistry and solution analysis. %%% Corrosion and passivity mechanisms are unclarified for emerging structural intermetallic materials proposed for structural applications as well as those formed in microelectronic processing. This research should clarify these mechanisms and lead to procedures for predicting electrochemical properties. ***