http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
질소 이온 주입시킨 7050Al 합금의 표면 미세구조 변화와 저주기 피로거동
이창우,권숙인 ( C . W . Lee,S . I . kwun ) 한국열처리공학회 1994 熱處理工學會誌 Vol.7 No.4
The surface microstructure modification by N^+ ion implantation into 7050Al alloy and its low cycle fatigue behavior were investigated. Ion implantation method is to physically implant accelerated ions to the surface of a substrate. High dose of nitrogen(5×10^(17)ions/㎠) were implanted into 7050Al alloy using current density of accellerating voltage of 100KeV. The implanted layers were characterized by Electron Probe-Micro Analysis(EPMA), Auger Elecron Spectroscopy(AES), X-Ray Diffraction(XRD), X-Ray Photoelectron Spectroscopy(XPS), and Transmission Electron Microscopy(TEM). The experimental results were compared with computer simulation data. It was shown that AlN was formed to 4500Å deep. The low cycle fatigue life of the N^+ ion modified material was prolonged by about three times the unimplanted one. The improved low cycle fatigue life was attributed to the formation of AIN and the damaged region on the surface by N^+ ion implantation.
이창우(C. W. Lee),송준엽(J. Y. Song),하태호(T. H. Ha) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
In general a square master and a dial gauge are used to measure the axis squareness on the spot. This method is a comparison measurement and its accuracy depends on the square accuracy wholly. Therefore the accuracy of a square master is very important and it is impossible that the accuracy of a square measurement is superior to the accuracy of a square master. In this paper, the new method of square measurement is proposed for measuring square without a square master and easily. This method is an absolute measurement by using a reversal method and can be used to measurement the accuracy of a square master.