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루테늄과 바나듐을 중간층으로 삽입한 인위적페리층의 교환작용과 미세구조
정영순(Youngsoon Jung),송오성(Ohsung Song),윤종승(Chong Seung Yoon) 한국자기학회 2003 韓國磁氣學會誌 Vol.13 No.5
We fabricated the synthetic ferrimagnetic layers (SyFL) of permalloy/X (X=Ru, V)/permalloy by varying the X thickness, and investigated the changes of coercivity (Hc), spin flopping field (Hsf), and saturation magnetization field (Hs) with a superconducting quantum interference device (SQUID). We also observed the microstructure with a cross sectional transmission electron microscope (TEM). Permalloy SyFL had less than 10 Oe coercivity, and Hsf and Hs could be tuned by varying ruthenium and vanadium layer thickness. The comparatively small exchange coupling in permalloy-V SyFL was caused by the intermixing of permalloy and vanadium decreasing the effective exchange coupling thickness.
Ti-Nb 합금강에서 합금성분의 변화에 따른 석출물거동이 고온연성에 미치는 영향
한원배 ( Won Bae Han ),이종호 ( Jong Ho Lee ),김희수 ( Hee Soo Kim ),안현환 ( Hyeun Hwan An ),이승재 ( Seung Jae Lee ),김성우 ( Seong Woo Kim ),서석종 ( Seok Jong Seo ),윤종승 ( Chong Seung Yoon ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.4
Hot ductility behavior of precipitation-hardened low-carbon iron alloys containing 0.02 wt% Ti and 0.05 wt% Nb was characterized by a hot tensile stress test. Carbon (0.05, 0.1, 0.25 wt%) and boron (0.002 wt%) contents were varied to study the effect of precipitates on the high-temperature embrittlement of the alloys in the temperature range of 600~800℃. Ductility loss was observed at 700℃ for the tested alloys. The cause of the ductility loss was mainly attributed to the carbides and ferrite films formed at the grain boundaries during deformation. Although the carbon content tended to raise the total fraction of Nb (C, N), the precipitates were formed mostly in the grain interior as the precipitation temperature was raised above the deformation temperature by the high carbon content. Hence, carbon in excess suppressed the hot ductility loss. Meanwhile, boron addition improved the hot ductility of the alloys. The improvement is likely due to the boron atoms capturing carbon atoms and thus retarding the carbide formation.