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SiC 휘스커 보강 Al 복합재료의 미세조직과 기계적 특성에 관한 연구
김영환,이두영,이성학,김낙준 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.7
This study aims at establishing the correlation of microstructure and mechanical properties of 2124-T6 Al composites reinforced with 7, 15, 20 v/o SiC whiskers. Tensile tests along with Charpy impact tests were conducted over the test temperature range from -196℃ to 100℃. Notched round tensile tests and subsequent metallographic observations as well as in-situ SEM observation of crack opening processes were performed for the purpose of identifying the micro-mechanical processes involved in void initiation. The experimental results indicated that the impact energy was found to increase monotonically with decreasing the amount of SiC whiskers and with inceasing the test temperature. Microvoids were observed to nucleate at the interface between the aluminum matrix and SiC whikskers, confirming that the formation of voids at the interfaces is the main metallurgical factor which contributes to the reduction of fracture toughness. In addition, the Mn-containing intermetallic particles strongly affect the fracture processes in these composites.
김영환,유기준,신만용 ( Young Hwan Kim,Ki Joon Yoo,Man Yong Shin ) 한국산림과학회 1998 한국산림과학회지 Vol.87 No.3
The objective of this study was to present the proper criteria which could be efficiently used for dividing the land-use zones in Korean national parks. Delphi technique was employed to collect data for this study. The Delphi process was designed with 3 round questionaries for Korean panel experts. A list of 30 criteria was obtained to be considered in dividing land-use zones. From the results, the biological category, in which 10 criteria were involved, occupied the most part of them. This means that the panels consider the biological criteria to be the most important ones under the serious situation of environmental deterioration. Using the 30 criteria emerged from this study, it could be possible to analyze the fitness of the existing land-use zoning system. Prior to the application of these criteria to each park, however, the areal characteristics should be surveyed to select the proper criteria. The new zoning system based on the regional characteristics of each park could be efficiently utilized for management of Korean national parks.