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: Nanostructured Hypoeutectic Fe-B Alloy Prepared by a Self-propagating High Temperature Synthesis Combining a Rapid Cooling Technique | Nanoscale Res Lett 2009 4 11-16 DOI s11671-008-9195-4 NANO EXPRESS Nanostructured Hypoeutectic Fe-B Alloy Prepared by a Self-propagating High Temperature Synthesis Combining a Rapid Cooling Technique Licai Fu Jun Yang Qinling Bi Weimin Liu Received 8 September 2008 Accepted 17 October 2008 Published online 6 November 2008 to the authors 2008 Abstract We have successfully synthesized bulk nanostructured alloy using the one-step approach of a self-propagating high temperature synthesis SHS combining a rapid cooling technique. This method is convenient low in cost and capable of being scaled up for processing the bulk nanostructured materials. The solidification microstructure is composed of a relatively coarse uniformly distributed dendriteto a nanostructured eutectic matrix with a-Fe B and t-Fe2B phases. The fine eutectic structure is disorganized and the precipitation Fe2B is found in the a-Fe B phase of the eutectic. The dendrite phase has the t-Fe2B structure rather than a-Fe B in the alloy because the growth velocity of t-Fe2B is faster than that of the a-Fe with the deeply super-cooling degree. The coercivity Hc and saturation magnetization Ms values of the alloy are 11 A m and respectively. Moreover the alloy yields at 1430 MPa and fractures at 1710 MPa with a large ductility of at compressive test. Keywords Nanostructured eutectic alloy Self-propagating high temperature synthesis SHS Soft magnetic performance Mechanical behavior L. Fu J. Yang H Q. Bi W. Liu State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou 730000 People s Republic of China e-mail jyang@ L. Fu Graduate University of Chinese Academy of Sciences Beijing 100039 People s Republic of China e-mail tyyflc@ Introduction Nanostructured materials have been shown to exhibit outstanding high strength and hardness corrosion resistance good soft magnetic
