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결정립 미세화된 Cu-Zn-Al 형상기억합금의 열처리 조건에 따른 변태거동
강조원,장우양,양권승 ( J . W . Kang,W . Y . Jang,G . S . Yang ) 한국열처리공학회 1991 熱處理工學會誌 Vol.4 No.4
A small amount of misch metal and/or Zr was added as a dopant to 70.5wt%Cu-26wt%Zn-3.5wt%Al shape memory alloy in order to study the effect of grain refinement and heat treatments on the transformation behavior, stabilization of martensite, and shape memory ability. It was found that the addition of misch metal and Zr was very effective for reducing the grain size. The fracture mode has been changed from intergranular brittle fracture to ductile fracture with void formation and coalescence by the addition of misch metal and Zr. Aging of the β-phase decreases the M_5 temperature, but that of the martensite phase increases the A_s temperature. The hysteresis of transformation temperature ΔT(A_s-M_s) has an increasing tendancy by grain refinement. The crystal structure of martensite was identified as monoclinic structure. As the grain size decreased, martensite stabilization more easily occured and the shape, memory ability has been reduced by the grain size refined.
(Bi,La)FeO<sub>3</sub>-PbTiO<sub>3</sub> 세라믹스의 자전효과
이은구,이종국,장우양,김선재,이재갑,Lee Eun Gu,Lee Jong Kook,Jang Woo Yang,Kim Sun Jae,Lee Jae Gab 한국재료학회 2005 한국재료학회지 Vol.15 No.2
Magnetoelectric (ME) effects for lanthanum modified $BiFeO_3-PbTiO_3\;(BE-_xPT)$ solid solutions have been investigated. The value of magnetoelectric polarization coefficient, up is 10 times greater than that of $Cr_2O_3$. The results also show that up is due to a linear coupling between polarization and magnetization, and that up is independent of do magnetic bias and ac magnetic field. The ME effect is believed to be significantly enhanced due to breaking of the cycloidal spin state of a long-period spiral spin structure, via randomly distributed charged imperfections.
황명근(Myung-Keun Hwang),장우진(Woo-Jin Jang),양승용(Seong-Yong Yang) 한국조명·전기설비학회 2007 한국조명·전기설비학회 학술대회논문집 Vol.2007 No.5월
형광램프와 HID(high intensity discharge)램프는 수은(Hg)에 의해 빛을 방사한다. 산업환경의 변화속에서 침체기를 맞고 있는 국내 조명산업이 내부적으로 친환경 조명제품 개발에 주력하고, 외부적으로는 환경규제로 인한 피해를 최소화시킴과 동시에 적극적인 세계시장공략으로 고부가가치산업을 성장할 수 있도록 조명분야의 환경규제 동향을 조사하여 조명산업 전반에 널리 홍보함으로써 국내 조명산업의 지속적인 경쟁력 및 성장가능성 확보에 목적을 두고 있다. 선진국을 중심으로 제도화되고 있는 환경규제(RoHS, WEEE 등)에 따른 문제점과 예상 영향(피해)도를 조사, 분석하여 시기적절한 효율적인 발전방안을 모색함으로써 국내 조명산업의 지속적인 경쟁력 및 성장가능성 확보를 위한 조명산업 발전방안 제시에 목적을 두고 있다.
STD 11 냉간 금형강의 미세조직에 미치는 크라이오 처리 영향
최윤길 ( Yoon Gil Choi ),양권승 ( Guen Seung Yang ),조우석 ( Woo Suk Cho ),장우양 ( Woo Yang Jang ) 조선대학교 공학기술연구원 2008 공학기술논문지 Vol.1 No.1
Effect of cryogenic treatment on the microstructural change, retained austenite and precipitation has been studied in a STD 11 type cold-working die steel. The volume fraction of austenite increases but that of M7C3 decreases by increasing austenitizing time. However, the volume fraction of austenite decreases and carbide particles becomes finer and more uniform by cryogenic treatment i.e holding at -196 after austenilizing. The amartensite, which is transformed by austenitizing and then quenching, is coverted to tempered martensite by tempering at 550 and the size of carbides precipitated in tempered martensite becomes finer with increasing cryogenic treatment time.