Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Wettability of amorphous and nanocrystalline Fe78B13Si9 substrates by molten Sn and Bi | Shen et al. Nanoscale Research Letters 2011 6 318 http www.nanoscalereslett.eom content 6 1 318 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Wettability of amorphous and nanocrystalline Fe78B13Si9 substrates by molten Sn and Bi Ping Shen 1 JianXin Sun1 Jun Yang1 Yan Qi2 and QiChuan Jiang1 Abstract The wettability of amorphous and annealing-induced nanocrystalline Fe78B13Si9 ribbons by molten Sn and Bi at 600 K was measured using an improved sessile drop method. The results demonstrate that the structural relaxation and crystallization in the amorphous substrates do not substantially change the wettability with molten Bi because of their invariable physical interaction but remarkably deteriorate the wettability and interfacial bonding with molten Sn as a result of changing a chemical interaction to a physical one for the atoms at the interface. Introduction Amorphous and nanocrystalline alloys are newly developed materials with a number of superior physical chemical and mechanical properties which are of significant importance for basic scientific research and potential engineering applications 1 2 . The amorphous alloys are characterized by short-range order and long-range disorder without the presence of any grain boundary in their crystallographic structure whereas the nanocrystalline materials possess high specific surface areas and a large d ensity of grain boundaries or interphase boundaries. These distinct features are expected to bring about novel phenomena such as wetting at their surfaces interfaces different from those of conventional coarse-grained polycrystalline substrates 3 . On the other hand up to now the maximum dimensions of the bulk amorphous and nanocrystalline alloys that can be directly prepared are still quite limited typically no more than centimeters thus constraining their applications in many situations. A potential way to achieve breakthrough in the size limitation is to develop appropriate joining .