On the microstructure of graphite spherulites in cast irons by TEM and HREM |
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| Affiliation: | 1. Department of Materials Science and Engineering, Beijing University of Science and Technology, Beijing, P.R. China;2. Department of Physical Chemistry, Beijing University of Science and Technology, Beijing, P.R. China;3. Materials Testing Centre, Northeast University of Techology, Shenyang, P.R. China;1. School of Engineering and Agronomy, National University Arturo Jauretche, Av Calchaqui no. 6200, B1888BTE, Florencio Varela, Argentina;2. Institute of Physics of Liquids and Biological Systems (IFLYSIB), CONICET and National University of La Plata, Argentina;1. School of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, China;2. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China;3. State Key Laboratory of Marine Coatings, Marine Chemical Research Institute Co., Ltd., Qingdao, 266071, China;1. School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an, Shaanxi, 710021, China;2. China North Engine Institute, Datong, Shanxi, 037036, China;1. Key Laboratory of Inorganic Chemistry in Universities of Shandong, Department of Chemistry and Chemical Engineering, Jining University, Qufu, Shandong 273155, PR China;2. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, PR China;3. Faculty of Materials Science & Chemical Engineering, Ningbo University, Ningbo, Zhejiang 315211, PR China |
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| Abstract: | The microstructure of graphite spherulites (G.S.) in nodular cast irons doped with either Ce or (Mg + Ce) has been extensively studied using transmission electron microscopy (TEM), μ-diffraction and lattice images techniques. The results show that the section of a well-developed G.S. consists of fan-like areas formed from platelets with sizes ranging from several to tens nm radial and hundreds nm circumferential. The 001] direction of the graphite platelets within each fan-like area tends to parallel to the radius of the G.S. but spreads about ± 10° among them. 002 Lattice images of graphite reveal the arrangement of graphite based plane layers, such as branching, bending and stages with intercalary layers besides dislocations and faults. These structural characteristics of G.S. have shown that {001} planes of graphite did grow predominatly through the formation of stages by intercalary layers of ceriumoxide and ceriumoxysulfide, then the G.S. takes its final morphology. |
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