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냉간압연가공에 따른 Al-5.5Mg-2.9Si계와 Al-7Mg-0.9Zn계 합금의 압연가공성 및 기계적 특성 차이
양지훈,이성희,Yang, Ji-Hun,Lee, Seong-Hee 한국재료학회 2016 한국재료학회지 Vol.26 No.11
The cold rolling workability and mechanical properties of two new alloys, designed and cast Al-5.5Mg-2.9Si and Al-7Mg-0.9Zn alloys, were investigated in detail. The two alloy sheets of 4 mm thickness, 30 mm width and 100 mm length were reduced to a thickness of 1 mm by multi-pass rolling at ambient temperature. The rolling workability was better for the Al-7Mg-0.9Zn alloy than for the Al-5.5Mg-2.9Si alloy; in case of the former alloy, edge cracks began to occur at 50% rolling reduction, and their number and length increased with rolling reduction; however, in the latter alloy, the sheets did not have any cracks even at higher rolling reduction. The mechanical properties of tensile strength and elongation were also better in the Al-7Mg-0.9Zn alloy than in Al-5.5Mg-2.9Si alloy. Work hardening ability after cold rolling was also higher in the Al-7Mg-0.9Zn alloy than in the Al-5.5Mg-2.9Si alloy. At the same time, the texture development was very similar for both alloys; typical rolling texture developed in both alloys. These differences in the two alloys can primarily be explained by the existence of precipitates of $Mg_2Si$. It is concluded that the Al-7Mg-0.9Zn alloy is better than the Al-5.5Mg-2.9Si alloy in terms of mechanical properties.
양지훈(Ji-Hoon Yang),김성환(Sung-Hwan Kim),송민아(Min-A Song),정재훈(Jae-Hun Jung),정재인(Jae-In Jeong) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.3
The properties of AlTiN films by a cathodic arc deposition process have been studied. Oblique angle deposition has been applied to deposit AlTiN films. AlTiN films have been deposited on stainless steel (SUS304) and cemented carbide (WC) at a substrate temperature of 500℃. AlTiN films were analyzed by scanning electron microscopy, glow-discharge light spectroscopy, micro-vickers hardness, and nanoindenter. When applying a current of 50 A to the cathodic arc source, it showed that the density of macroparticle of AlTiN films was 5 lower than other deposition conditions. With the increase of the bias voltage applied to the substrate up to –150 V, the density of macroparticle was decreased. The change of the N₂ flow rate during coating process made no influence on the film properties. For the multi-layered films, the film prepared at oblique angle of 60° showed the highest hardness of 28 GPa and H³/E² index of 0.18. AlTiN films have been shown a good oxidation resistance up to 800℃.
정재훈(Jae-Hun Jung),양지훈(Ji-Hoon Yang),박혜선(Hye-Sun Park),송민아(Min-A Song),정재인(Jae-In Jeong) 한국표면공학회 2012 한국표면공학회지 Vol.45 No.3
Oblique angle deposition (OAD) is a physical vapor deposition where incident vapor flux arrives at nonnormal angles. It has been known that tilting the substrate changes the properties of the film, which is thought to be a result of morphological change of the film. In this study, OAD has been applied to prepare single and multilayer TiN films by cathodic arc deposition. TiN films have been deposited on cold-rolled steel sheets and stainless steel sheet. The deposition angle as well as substrate temperature and substrate bias was changed to investigate their effects on the properties of TiN films. TiN films were analyzed by color difference meter, scanning electron microscopy, nanoindenter and x-ray diffraction. The color of TiN films was not much changed according to the deposition conditions. The slanted and zigzag structures were observed from the single and multilayer films. The relation between substrate tilting angle (α) and the growth column angle (β) followed the equation of tanα = 2tanβ. The indentation hardness of TiN films deposited by OAD was low compared with the ones prepared at normal angle. However, it has been found that H³/E² ratio of 3-layer TiN films prepared at OAD condition was a little higher than the ones prepared at normal angle, which can confirm the robustness of prepared films.
정재훈(Jae-Hun Jung),양지훈(Ji-Hoon Yang),송민아(Min-A Song),김성환(Sung-Hwan Kim),정재인(Jae-In Jeong),이명훈(Myeong-Hoon Lee) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.4
Double layer films which consisted of aluminum(Al) and magnesium(Mg) have been prepared by e-beam deposition. The structure, alloy phase, and corrosion resistance of the prepared films were investigated before and after heat treatment. The first (bottom) layer fixed with Al, and the thickness ratio between Al and Mg layers has been changed from 1 : 1 to 5 : 1, respectively. Total thickness of Al-Mg film was fixed at 3 μm. The cold-rolled steel sheet was used as a substrate. Heat treatment was fulfilled in an nitrogen atmosphere at the temperature of 400℃ for 2, 3 and 10 min. Surface morphology of as-deposited Al-Mg film having Mg top layer showed plate-like structure. The morphology was not changed even after heat treatment. However, cross-sectional morphology of Al-Mg films was drastically changed after heat treatment, especially for the samples heat treated for 10 min. The morphology of as-deposited films showed columnar structure, while featureless structure of the films appeared after heat treatment. The x-ray diffraction data for as-deposited Al-Mg films showed only pure Al and Mg peaks. However, Al-Mg alloy peaks such as Al3Mg2 and Al12Mg17 appeared after heat treatment of the films. It is believed that the formation of Al-Mg alloy phase affected the structure change of Al-Mg film. It was found that the corrosion resistance of Al-Mg film was increased after heat treatment.
정재훈(Jae-Hun Jung),양지훈(Ji-Hoon Yang),김성환(Sung-Hwan Kim),변인섭(In-Seop Byeon),정재인(Jae-In Jeong),이명훈(Myeong-Hoon Lee) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.5
Double-layered Al-Mg films have been deposited by using an e-beam deposition method on a cold-rolled steel sheet(CR), which the structure of the film was Al/Mg/CR. The micro-structure, alloy phase, and corrosion resistance of the Al-Mg coated CR were investigated before and after heat treatment at 400℃ for 2, 3, and 10 min in a nitrogen atmosphere. Total thickness of Al-Mg films was fixed at 3 ㎛ and the thickness ratio of Al and Mg layers(Al:Mg) has been changed from 5:1 to 1:5. The cross-sectional morphology of the films, which had the thickness ratio of 2:1(Al:Mg), 1:1, and 1:2, was changed after heat treatment from columnar to featureless structure. The x-ray diffraction data for as-deposited films showed only pure Al and Mg peaks. Al-Mg alloy peaks such as Al₃Mg₂ and Al12Mg17 phase appeared after the heat treatment. The Al-Mg coating with the thickness ratio of 1:1(Al:Mg) showed the best corrosion resistance of up to 500 hours by salt spray test.
박혜선(Hye-Sun Park),양지훈(Ji-Hoon Yang),정재훈(Jae-Hun Jung),송민아(Min-A Song),정재인(Jae-In Jeong) 한국표면공학회 2012 한국표면공학회지 Vol.45 No.3
Oblique angle deposition (OAD) is a physical vapor deposition method which utilizes non-normal angles between the substrate and the vaporizing source. It has been known that tilting the substrate changes the properties of the film deposited on it, which was thought to be a result of morphological change of the film. In this study, OAD has been applied to prepare single and multilayer Al films by magnetron sputtering. The magnetron sputtering source of 4 inch diameter was used to deposit the films. Al films have been deposited on Si wafers and cold-rolled steel sheets. The multilayer films were prepared by changing the tilting angle upside down at each layer interval, which means that when the first layer was deposited at an angle of +45°, the second layer was deposited at an angle of ?45°, and vice versa. The microstructure, surface roughness and reflectance of the films were investigated using a scanning electron microscope, a surface profiler and a spectrophotometer, respectively. The corrosion resistance was measured and compared using the salt spray test. The single layer film prepared at an oblique angle of 60° showed a smoother surface than the films prepared at other angles. However, for the multilayer films, the film prepared at an oblique angle of 45° showed the most compact and featureless structure. The multilayer films were found to exhibit higher corrosion resistance than the single layer films.
송민아(Min-A Song),양지훈(Ji-Hoon Yang),정재훈(Jae-Hun Jung),김성환(Sung-Hwan Kim),정재인(Jae-In Jeong) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.4
In this study, TiAlSiN coatings have been successfully synthesized on stainless steel and tungsten carbide substrate by a hybrid coating method employing a cathodic arc and a magnetron sputtering source. TiAl and Si target were vaporized with the cathodic arc source and the magnetron sputtering source, respectively. Process gas was the mixture of nitrogen and argon gas. With the increase of Si content, the crystallinity and the grain size of TiAlSiN film was decreased. At the Si content of more than 8 at.%, grain size of TiAlSiN was saturated at around 2 nm. The hardness value of the TiAlSiN film increased with incorporation of Si, and had the maximum value of ~ 3,233 Hv at the Si content of 9.2 at.%. The oxidation resistance of TiAlSiN film was enhanced with the increase of Si content.