Al-7% Mg 합금의 β-상 고용거동과 기계적 성질

박상보,최종술 대한금속재료학회(대한금속학회) 1976 대한금속·재료학회지 Vol.14 No.4

高純度 알루미늄과 마그네슘 金屬을 가지고 Al-7% Mg 二元合金을 熔製하여서 所定形狀의 各種試片을 製作하여 다음과 같은 몇 가지 試驗들을 行했다. (1) 350∼450℃間의 各溫度에서 恒溫加熱時의 β-相固溶 곡선을 얻어서 溫度와 時間의 두 變數에 대한 固溶擧動을 檢討하였다. (2) β-相固溶에 따른 引張强度 및 伸率을 調査하였으며 (3) 또, β-相固溶에 따른 衝擊靭性을 調査하고 동시에 破面樣相을 관찰하였다. 以上의 調査들로부터, 이 合金에 있어서 强度와 靭性의 좋은 組合을 나타내는 最適條件의 熱處理가 제시되었다.

Mo-65.8at%Si 혼합분말의 기계적 합금화에 미치는 밀링매체 재료의 영향

박상보,변창섭,박인용,김동관,이진형 대전산업대학교 반도체기술연구소 1999 半導體技術硏究所報 Vol.1 No.-

Milling media of steel and zirconia were used to produce Mosi_2 by mechanical alloying (MA) of Mo and Si powders. The effect of milling media on Ma ofMo-65.8at%Si powder mixture has been investigated by SEM, XRD, DTA and in-situ thermal analysis. The powders mechanically alloyed by milling medium of steel for 8 hours showed the structure of the mixture of Mo and Si, and those mechanically alloyed by milling medium of zirconia for longer milling time showed the structure of fine mixture of Mo and Si. The tetragonal a-MoSi_2 phase and the tetragonal Mo_5Si_3 phase appeared with small Mo peaks in the powders milled by milling medium of steel for 4 and 8 hours. The a-MoSi_2 phase and the hexagonal B-MoSi_2 phase were formed after longer milling time. The a-MoSi_2 phase appeared with large Mo peaks in the powders milled by milling medium of zirconia for 4 hours. The phases, a-MoSi_2 and B-MoSi_2, were formed in the powders milled for longer milling time. DTA and annealing refults showed that Mo and Si were transformed into a-MoSi_2 and Mo_5Si_3, while B-MoSi_2 into a-MoSi_2. In-situ thermal analysis results demonstrated that there were a sudden temperature rise at 212 min and a gradual increase in temperature in case of milling media of steel and zirconia, respectively. The results indicate that MA can be influenced by materials of milling medium which can give either impact energy on powders or thermal energy accumulated in vial.

In₁??Ga??P의 전계루미네센스 특성에 관하여

김선태,박상보 大田工業大學 1991 한밭대학교 논문집 Vol.8 No.1

The electroluminescence properties of Ⅲ-Ⅴ ternary alloy semiconductor In_1-XG_aXP has been investigated on Zn-diffused p-n In_1-XG_axP homojunction diodes. In the electroluminescence spectra of undoped In_1-XG_aXP at 77K, three peaks due to the recombination of near band edge, pair of shallow donor-Si acceptor and the pair of deep Zn-O complex donor-Zn acceptor were observed. However, in the Te-doped In_1-XG_aXP at 77K, one emission peak due to the recombination of Te donor-Zn acceptor pair was observed. The activation energy for the thermal quenching of light emission above 200K was found as 25.2 meV. The electroluminescence peak energy shift out with increasing the injection current was considered that the light emission from p-n In_1-XG_aXP diode was due to the recombination of carriers in the space charge region by the band-filling and the tunnelling mechanisms.

Al합금의 기계적성질에 미치는 섬유조직의 영향

이병영,박상보 大田産業大學校 1993 한밭대학교 논문집 Vol.10 No.2

The fcc metal generally have a dual texture, <111> and <100>, after wire extrusion. The relative amounts of <111> and <100> fiber texture depending upon its initial orientation, stacking fault energy and heat treat condition after working. For 2017 Al alloy, increasing the amount of <111> fiber texture with increasing the strength. But the <111> fiber texture decrease with solution treatment after working, leading to the weak randomized sample.

Mo-65.8at%Si 혼합분말의 기계적 합금화에 미치는 밀링매체 재료의 영향

박상보 한국분말야금학회 1997 한국분말재료학회지 (KPMI) Vol.4 No.3

Milling media of steel and zirconia were used to produce $MoSi_2$ by mechanical alloying (MA) of Mo and Si powders. The effect of milling media on MA of Mo-65.8at%Si powder mixture has been investigated by SEM, XRD, DTh and in-situ thermal analysis. The powders mechanically alloyed by milling medium of steel for 8 hours showed the structure of fine mixture of Mo and Si, and those mechanically alloyed by milling medium of zirconia for longer milling time showed the structure of fine mixture of Mo and Si. The tetragonal $\alpha$-$MoSi_2$ Phase and the tetragonal $Mo_5Si_3$ phase appeared with small Mo peaks in the powders milled by milling medium of steel for 4 and 8 hours. The $\alpha$-$MoSi_2$ phase and the hexagonal $\beta$-$MoSi_2$ phase were formed after longer milling time. The $\alpha$-$MoSi_2$ phase appeared with large Mo peaks in the powders milled by milling medium of zirconia for 4 hours. The phases, $\alpha$-$MoSi_2$ and $\beta$-$MoSi_2$. were formed in the powders milled for longer milling time. DTA and annealing results showed that Mo and Si were transformed into $\alpha$-$MoSi_2$ and $Mo_5Si_3$, while $\beta$-$MoSi_2$ into $\alpha$-$MoSi_2$. In-situ thermal analysis results demonstrated that there were a sudden temperature rise at 212 min and a gradual increase in temperature in case of milling media of steel and zirconia, respectively. The results indicate that MA can be influenced by materials of milling medium which can give either impact energy on powders or thermal energy accumulated in vial.

Al-Zn-Mg-Cu合金의 析出硬化 및 加工度의 影響에 關한 硏究

朴尙輔 大田工業大學 1988 한밭대학교 논문집 Vol.5 No.2

As the results of the comparison and the examination for the age hardening according to the reduction changes of Al-Zn-Mg-Cu alloy, the following results are obtained; 1. The more the reductions are increased, the more the grains are fine in the direction of L and ST, 2. As the reduction are increased from 10% to 60%, the hardness rapidly increased on the conditions of up to 18hrs of aging time, and the max, hardness is obtained on the condition of the aging temp 90℃ by the reduction 60%. 3. As the ageing temp. are increased from 90℃ to 150℃, the hardness are decreased by the retrogression phenomena over the 24hrs of ageing time. 4. The hardness are increased by the rehardening on the condition of the 42hrs and 96hrs of ageing time at the ageing temp. 90℃, and the 48hrs and 96hrs of the ageing time at 1:he ageing temp. 120℃ and 150℃.

Al-4.5% Cu合金의 機械的性質에 미치는 Si,Mg 및 Zn의 影響에 關한 硏究

朴尙輔 大田工業專門大學 1982 論文集 Vol.31 No.-

Cr-Mo망의 破壞靭性에 미치는 熱處理影響에 關한 硏究

朴尙輔 大田工業專門大學 1983 論文集 Vol.33 No.-

In this study, the effect of temperature change in the heat-treatment to the fracture toughness of Cr-Mo Martensite steel are investigated. On the results of investigating and reviewing the Repeat Quenching and the roll Quenching in the Conventional Quenching that can improve the mechanical properties, The results ob tamed are as follows: 1. In case that CrMo steel temperature about 200℃ after quenching are used as the High, tensile structural steels, if those are quenched on the temperature 1000℃ or to take the roll quenching on the temperature 850℃, tile fracture toughness KIC are increased in the region of High Strength. 2. Although the tensile strength of the materials taken the repeat quenching are larger than that taken the conventional quenching on the temperature 850℃, the improvements of KIC are not expeeted. 3. It the quenching temperature of the materials taken the conventionals quenching will be 1150℃ in such a case of tempering temperature being below 400℃ KIC should be increased without decreasing the strength.

A1-Si 共晶系合金의 熔解 및 鑄入溫度가 機械的性質에 미치는 影響에 關한 硏究

朴尙輔 大田工業專門大學 1981 論文集 Vol.28 No.-

Al-Si 共晶系合金의 鎔解溫度 및 鑄入溫度가 機械的性質에 미치는 影響을 調査 檢討하였다. 특히 Al-Si 合金에서 Ni, Cu, Mg을 添加시킨후 20℃-30℃의 차이를 두고 20種의 試料를 ??作한 다음 熱處埋등을 行하여 다음과 같은 結論을 얻었다. 가장 적합한 鎔解溫度 및 鑄入溫度는鎔解溫度 800℃에서 鑄入溫度 740℃~770℃의 溫度 구역이었다. 700℃~800℃의 溫度구역에시는 鎔解溫度 및 鑄入溫度가 높을수록 引張强度는 增價하였으며 最大引張强度는 鎔解溫度 800℃에서 鎔解溫度 740℃~770℃ 溫度區域이었다. Al-Si 合金에 Ni, Cu, Mg을 添加한 多元系合金에 있어서는 引張强度에 미치는 熱處理效果는 대단히 크다. 硬度와 Si이 徵細化는 일치하지 않았으며 Si의 微細化는 引張强度를 增加시킨다. The effect on the Mechanical Properties of Al-Si eutectic System alloy are examined according to melting and pouring temperature. Particularly, 20 Kinds of test pieces were manufactured by adding Nikel, Cupper, Magnesium to Al-Si system al toy in accordance with 20∼30℃ pouring temperature difference, and heat-treated. The following results obtained; The best adequate pouring temperature is the range from 740℃ to 770℃ when melting temperature is 800℃. On above mentioned conditions, maximum tensile atrength acquired. In the melting temperature range from 700℃ to 800℃, the higher pouring temperature, the higher tensile strength. In the polynary alloy adding Nikel, Cupper, Magnesium to Al-Si alloy, the heat treatment effects very large in the tensile strength. Si-refining does not agreed with the hardness and increases the tensile strength.

Ni, Cu, Mo合金鑄鐵이 耐磨耗性에 미치는 影響에 關한 硏究

朴相俊,朴尙輔 大田開放大學 1986 論文集 Vol.5 No.-

As the results of short wear test and engin test for the pearlite cast iron and gray cast iron added with Ni, Cu, and Mo contents. The following results are obtained; 1. Pearlite cast iron have been weared about 1.8 times more than gray cast iron added with Ni, Cu, and Mo contents. 2. The ratio of maximum were quantity in short wear test to in engin test is almost fixed, 3. The maximum wear quantity in short wear test is found in the condition of velocity being 0.6 m/sec.