Effects of order-disorder reactions on rapidly quenched Fe-6.5%Si alloy

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• 作者：Claudio Cassio Lima ; M谩rio Cezar Alves da Silva ; Maria Dorot茅ia Costa Sobral ; Rodrigo Estevam Coelho ; Claudemiro Bolfarini
• 关键词：Ordering reactions ; Magnetic properties ; Fe&ndash ; 6.5%Si ; Spray forming
• 刊名：Journal of Alloys and Compounds
• 出版年：15 February, 2014
• 年：2014
• 卷：586
• 期：supp_S1
• 页码：S314-S316
• 全文大小：627 K

文摘

Deposits of the Fe-6.5wt.%Si alloy rapidly quenched by spray forming were investigated. The order phase can be either B₂ or DO₃ depending on annealing treatment conditions. The observation of pairs dislocations indicates the presence of super dislocations and B₂ antiphase boundaries (APBs) which affects significantly the soft magnetic properties. The dislocations bound the APBS which yield 未 fringes when image 200 superlattice reflections. Samples treated at 700 掳C for 1 h were oil quenched, this has induced a decreasing of power loss and the TEM micrographs have showed developed 1/4銆? 1 1銆?anti phase domain structure in the B₂ phase. The magnetic properties were: power loss of 1.59 W/kg and coercive force of 76 A/m, at B = 1 T, f = 60 Hz. The samples annealed at 1250 掳C for 1 h presented the same interaction between the APBs and magnetic properties presenting better power losses. The magnetic properties were: power loss of 1.30 W/kg and coercive force of 40 A/m, at B = 1 T, f = 60 Hz. This suggests a strong interaction between magnetic properties and anti phase domain structure in the B₂ ordered phase. Optical microscopy observations corroborate the magnetic measurement conclusions.