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Cu-Zn-Al계 형상기억합금의 변태특성에 미치는 열 Cycle 및 시효열처리의 영향
박평렬,김익준,박세윤,김인배,박익민 ( Pyeong Yeol Park,Ick Jun Kim,Se Yun Park,In Bae Kim,Ik Min Park ) 한국열처리공학회 1989 熱處理工學會誌 Vol.2 No.4
The hardenability of steel is related to its chemical composition. About this relationship, multiple regression analysis of hardenabililty data was proposed to explain the effect of chemical composition on a hardenability of steel. To establish the formula for calculation hardenability, given harndenability curve(U.S.S. Atlas) were quantitatively analyzed by multiple regression analysis program of computer. The established hardenability model was applied to predict the hardenability of commercial steel fair well. The effect of chemical composition was also expressed quantitatively.
김경제,김익준,김석균,전희 東國大學校 1997 東國論叢 Vol.36 No.-
Light transmittance of glass, PC, PET, and PE house were 64.7, 61.3, 60.7 and 56.4%, respectively. They were totally lower than transparency of their covering materials because of shading with frame and equipments. The best shading part of greenhouse recoded light transmittance of 36-40% was below gutter. Temperature in greenhouse from 21:00 to 08:00 was high in order of glass, PC, PET, and PE house according to accumulated heat energy in soil. The results of investigation for green pepper canopy and growth, plant height and node length in the glass house were longer than any other greenhouse. But the green pepper canopy for group production was best in the glass house because of higher light transmittance and diffussion of greenhouse. Therefore branch angle and canopy width of green pepper in glass house were more wide, and number of organs like leaf, stem and fruit of green pepper in the glass house were more than any other greenhouse.
기계적 합금화에 의한 Cu50 Ti50 분말의 비정질화
박익민,권해욱,김익준 대한금속재료학회(대한금속학회) 1992 대한금속·재료학회지 Vol.30 No.1
Polycrystalline powders containing 50at% Cu and 50at% Ti have been mechanically alloyed by using rotatory ball mill under the Ar atmosphere. The microstructural change of the Cu_50Ti_50 powder with milling time can be divided into four steps such as initial, cold welding, equiaxed particle formation and steady state periods. The microhardness was increased with milling time and reached about Hv 300 after the steady state. The size of crystallite was decreased at decreased rate with machanical alloying. The amorphization started at the steady state period and completed after about 30 hrs. of milling. The amorphous phase with CuTi composition was obtained.