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$Ni_{81}$$Fe_{19}$ 박막의 제조와 전자기특성
이원재,백성관,민복기,송재성 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.12
Ni$_{81}$$Fe_{19}$(200 nm) thin films have been deposited by RF-magnetron sputtering on Si(001) substrates, Atomic force microscopy(AFM), X-ray diffraction(XRD) and magnetoresistance(MR) measurements of the thin films for investigating electromagnetic properties and microstructures were employed. During field annelaing for 1hr, there was no big difference n XRD patterns of Ni$_{81}$$Fe_{19}$ thin films. However, there was a significant change in XRD patterns of Ni$_{81}$$Fe_{19}$ thin films deposited at 40$0^{\circ}C$ during in-situ magnetic field deposition. The degree of surface roughness increased with increasing annealing and deposition temperature. With variation of surface roughness, there was no significant difference in MR Characteristics of Ni$_{18}$ $Fe_{19}$ thin films in 1hr-annealed case. High MR ratio was observed in the case of in-situ field deposited Ni$_{81}$$Fe_{19}$ films. 19/ films.
白南柱,白成官,姜大敏 부산대학교 공과대학 1984 硏究報告 Vol.28 No.-
In this paper, creep tests on Al 7075 alloy are analyzed using a graphical optimization procedure to solve the constitutive equation at 220℃ under various stress and the calculated values of the constitutive equation are good agreement with the expermental values. In addition to the above study, the apparent energies Qc have been obtained during creep of Al 7075 alloy at 81.15Mpa under 210℃~230℃, the calculated values of the constitutive equation as well as experimental values are used for obtaining stress component(n) at 220℃ under 81.15Mpa~99.87Mpa and the internal stress σi have been determined during creep of Al 7075 alloy at 220℃ under 81.15~87.39Mpa, for the purpose of predicting the secondary creep mechanism at high temperature. According to these results, it is concluded that the steady state creep mechanism of Al 7075 alloy at high temperature was believed a dislocation climb, but at high stress a dislocation intersection process.
Al 7075 합금 의 크리이프 변형 기구 에 관한 연구
백남주,강대민,백성관 대한기계학회 1985 대한기계학회논문집 Vol.9 No.4
본 연구에서는 Al 7075 합금의 응력지수 값과 활성화 에너지값을 이용하여 변 형을 주도하는 기구를 규명하는데 그 목적이 있다. The apparent activation energy Q$_{c}$ and the applied stress exponent n have been determined during creep of Al 7075 alloy over the temperature range of 90.deg. C to 320.deg. C (0.4-0.65T$_{m}$) and stress range of 1.85 kgf/mm$^{2}$ to 21 kgf/mm$^{2}$, respectively in order to investigate the creep behavior. Constant load creep tests were carried out in the experiment. At round the temperature of 200.deg. C-240.deg. C and under the stress level 8.13-9.55kgf/mm$^{2}$ and again at around the temperature of 280.deg. C-320.deg. C and under the stress level of 1.85-2.55kgf/mm$^{2}$, the creep behavior obeyed for the creep deformation was nearly equal to that of the volume self diffusion of pure aluminum (34kcal/mole). But at around the temperature of 90.deg. C and under the stress level of 10-21kgf/mm$^{2}$, the creep behavior did not obey a simple power-law relation and the apparent activation enrgy, Q$_{c}$ was 26.01 kcal/mole. From the above facts, at around the temperature of 200.deg. C-240.deg. C and 280.deg. C-320.deg. C, the creep deformation for Al 7075 alloy seemed to be controlled by dislocation climb but at 90.deg. C, by cross slip over the range of experimental stress conditions.tions.