منابع مشابه
The behavior of grain boundaries in the Fe-based superconductors
The Fe-based superconductors (FBSs) are an important new class of superconducting materials. As with any new superconductor with a high transition temperature and upper critical field, there is a need to establish what their applications potential might be. Applications require high critical current densities, so the usefulness of any new superconductor is determined both by the capability to d...
متن کاملCoercivity enhancement of Nd-Fe-B sintered magnets by grain boundary modification via reduction-diffusion process
The interface between the Nd2Fe14B particles and the grain boundary surrounding them in Nd-Fe-B sintered magnets was modified by diffusion Dy metal selectively through the grain boundary involving the reduction of Dy2O3 or DyF3 with CaH2 and the coercivity of them was effectively enhanced from 0.98 MA/m to 1.42 MA/m with keeping the high value of remanence. The resultant coercivity was higher t...
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The segre ation of silicon to the C=3, 112) and C=S, (013) symmetrical grain boundaries 1 was studied in well-fefined bicrystals of an Fe-l .9 at%Si alloy annealed in the range 773 1173 K using Auger electron spectroscopy. The segregation enthal y, AI1 = -8.1 * 0.5 kJ/mol, and entropy, AS = -69 r 0.4 i/(mol K), were determined for the (013f grain boundary in the temperature range 973 1173 K. Fo...
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Understanding radiation responses of Fe-based metals is essential to develop radiation tolerant steels for longer and safer life cycles in harsh reactor environments. Nanograined metals have been explored as self-healing materials due to point-defect recombination at grain boundaries. The fundamental defect-boundary interactions, however, are not yet well understood. We discover that the intera...
متن کاملEffect of Post-Sintering Annealing Treatment on Magnetic Properties of Some Nd Fe b Based Magnets
Effects of post-sintering annealing treatment between 300 and 1000ºC for up to 8 hrs time periods followed by either furnace cooling (FC) or air-cooling (AC) on the hard magnetic properties of some Nd-Fe-B based sintered magnets was investigated. It was shown that the intrinsic coercivity (Hci), second quadrant demagnetization loop shape and thus the energy density (BH)max varied considerably a...
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ژورنال
عنوان ژورنال: Letters on Materials
سال: 2020
ISSN: 2218-5046,2410-3535
DOI: 10.22226/2410-3535-2020-4-566-571