• Title/Summary/Keyword: Magnesium

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A Study on Warm Forming Technology of Car Body Reinforced Dash Using Magnesium Alloy Sheet (마그네슘 합금 판재를 활용한 차체 Reinforced Dash 부품 온간성형 공정 연구)

  • Park, Dong Hwan;Tak, Yun Hak
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.23 no.5
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    • pp.519-524
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    • 2014
  • The use of light weight magnesium alloy offers significant potential towards improvement of the automotive fuel efficiency. However, the application of formed magnesium alloy components in auto-body structures is restricted due to the low formability at room temperature and lack of knowledge for processing magnesium alloys at elevated temperatures. In this study, a warm tensile test of magnesium alloys was performed to measure tensile strength and elongation. An improvement in formability was confirmed at increased temperatures above about $250^{\circ}C$. Car body warm forming technology was conducted for forming forming reinforced dash components of the magnesium alloy AZ31B sheet at elevated temperatures.

Studies on the Contents of the Trace Elements in Vegetables. (식품중 미량원소의 함량에 관한 연구)

  • Lee, S.K.;Youn, J.E.;Lee, S.H.;Hur, Y.H.;Lee, B.O.
    • Journal of Environmental Health Sciences
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    • v.3 no.1
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    • pp.13-16
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    • 1976
  • Authors investigated the analyse trace elements in vegetables and Ginseng which indicated as follows: 1. Garlic, ginger, and onion has considerably large amounts of magnesium, garlic has in proper sequence as copper, aluminum, magnesium, bromine and mercury. Ginseng has in proper sequence as aluminum, magnesium, copper, bromine and mercury, and onion has in proper sequence as copper, manganese, aluminum, bromine and mercury. 2. Carrot has considerably large amounts of magnesium and has in proper sequence as copper, magnesium, aluminum, bromine and mercury. 3. Ginseng also has large amounts of magnesium and has in proper sequence as magnesium, aluminum, copper, bromine, and mercury.

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Fused Salt Electrolysis of Magnesium Chloride (염화마그네슘의 용융염전해 연구)

  • Lee, Hoo-In
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2007.06a
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    • pp.546-547
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    • 2007
  • Magnesium is widely used as a lightweight alloy for car engine components and case of cellular phone. Extraction technologies of magnesium are divided to fused salt electrolysis process and thermal reduction process. In this study, electrolysis magnesium is prepared by fused salt electrolysis process with magnesium chloride. We compared two kinds of mixed salt at 7V. As a result, 47% of current efficiency was obtained by electrolyzing KCl/NaCl/$MgCl_2$ mixed salt bath at $760^{\circ}C$, and purity of the prepared magnesium was over 98%. With this study, we can scale up fused salt electrolysis device and accumulate basic data which will be needed for designing an electrolysis cell.

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A Study on the Evaporation Behavior of Magnesium Alloy (AM50) Scrap Melt under Reduced Pressure (감압 하에서 마그네슘 합금(AM50) 스크랩 용탕의 증발 거동에 관한 연구)

  • Wi, Chang-Hyun;Hong, Seong-Hun;You, Byung-Don
    • Korean Journal of Metals and Materials
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    • v.48 no.3
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    • pp.241-247
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    • 2010
  • In order to develop the vacuum distillation process of magnesium alloy scrap, a fundamental study on the evaporation behavior of magnesium alloy (AM50) scrap melt was carried out. Melt temperature, pressure, reaction time, and initial specific surface area of melt were considered as experimental variables. The evaporation rate of magnesium increased with the increase of melt temperature and initial specific surface area of melt, and with the decrease of the pressure. The activation energy of magnesium evaporation reaction calculated by an Arrhenius plot decreased with the decrease of the pressure and with the increase of the initial specific surface area of melt. An empirical equation was derived for the evaporation rate of magnesium from AM50 alloy melt.

Effect of Solution-treated on Electrochemical Properties of AZ91 Magnesium Alloy Anode

  • Zhiquan, Huang;Yanjie, Pei;Renyao, Huang;Xiangyu, Gao;Jinchao, Zou;Lianyun, Jiang
    • Journal of Electrochemical Science and Technology
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    • v.13 no.4
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    • pp.486-496
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    • 2022
  • The effect of solution-treated on the self-corrosion performance and discharge performance of AZ91 magnesium alloy as anode material was analyzed by microscopic characterization, immersion tests, electrochemical measurements, and discharge performance tests. The study shows that the β-phase in the AZ91 magnesium alloy gradually dissolved in the matrix with the increase of the solution temperature, and the electrochemical activity of the magnesium alloy anode was significantly improved. Through the comparison of three different solution-treated processes, it is found that the AZ91 magnesium alloy has the most vigorous activity and better discharge performance after solution-treated of 415℃+12 h. In addition, the proportion and distribution of β-phase AZ91 magnesium alloy have a direct impact on its discharge performance as an anode material.

Use of Magnesium in Anesthesiology and Pain Medicine (마취통증의학에서의 마그네슘 사용)

  • Seong, Chae-Rim;Jee, Dae-Lim
    • Journal of Yeungnam Medical Science
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    • v.26 no.2
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    • pp.93-101
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    • 2009
  • The use of magnesium sulphate has recently increased in anesthesiology and pain medicine. The roles of magnesium sulphate are as an analgesic adjuvant, a vasodilator, a calcium channel blocker and reducing the anesthetic requirement. These effect are primarily based on the regulation of calcium influx into the cell and antagonism of the N-methyl-D-aspartate receptor. We discuss here the clinical effects of magnesium sulphate on anesthesiology and pain medicine.

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Magnesium· 흠핍백서 치근모에 있어서의 조직화학적 연구

  • Hwang, Ku-Sun
    • The Journal of the Korean dental association
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    • v.12 no.5
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    • pp.309-312
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    • 1974
  • The auther observed the effect of dietary magnesium dificiency on the periodontal ligament of albino rats. The experimental animals wre fed with a diet deficient in magnesium for 1,2 and 3weeks. The sections were stained van Gieson, Mallory azan. Massons-Gomori's one step trichrom. Biolschowsky-Gomori, PAS reaction and Halmi stain. After 2 and 3weeks with dietary magnesium deficiency, argyrophilic fiber of periodontal ligament were showed increased-reactivity. Oxytalan fibers were not changed by magnesium deficiency.

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A Study on the GTAW of Magnesium Alloys (마그네슘 합금의 GTA 용접특성에 관한 연구)

  • Yun, Byeong-Hyeon;Jang, Ung-Seong
    • Proceedings of the KWS Conference
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    • 2007.11a
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    • pp.144-145
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    • 2007
  • Magnesium alloys are the lightest in commercial alloys. Also, they have high damping capacity and the shielding effect of electromagnetic waves. Recently, magnesium alloys have received considerable attention from the transportation industry. Many manufacturers of cars try to increase the use of magnesium alloys in their product. In order to evaluate the weldability of magnesium alloy, gas-tungsten arc welding(GTAW) have been applied to the AZ31, AZ61 and AZ91 alloys and established the optimum welding conditions.

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Deoxygenation of ${\beta}$-Aryl-${\alpha}$,${\beta}$-Epoxy Silanes to Vinylsilanes by Magnesium-Magnesium Halide

  • Kang, Kyung-Tae;Park, Chun-Yi;Kim, Joung-Sook
    • Bulletin of the Korean Chemical Society
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    • v.13 no.1
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    • pp.48-53
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    • 1992
  • The reactions of ${\beta}-aryl-{\alpha},{\beta}-epoxy$ silanes with magnesium bromide or magnesium iodide in the presence of excess magnesium in ether at room temperature afforded vinylsilanes in 18-100% yields. E-Vinylsilanes were predominant over Z-isomers (> 80%) regardless of the stereochemistry of ${\alpha},{\beta}-epoxy$ silanes.

Experimental Study on the Formability of Simultaneous Deep Drawing of Circular and Rectangular Cups with AZ31 Magnesium Alloy (AZ3l 마그네슘 판재의 더블 싱크형 딥드로잉 공정의 성형성에 관한 실험적 연구)

  • Kwon, K.T.;Kang, S.B.;Kang, C.G.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.10a
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    • pp.149-153
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    • 2008
  • Since magnesium alloy sheets have been employed in industrial field which requires the light weight and thin engineering components, most of researches have been focused on the formability of magnesium ahoy sheet. In warm press forming of magnesium alloy sheet, it is important to control the sheet temperature by heating the sheet in closed die. When forming a commercial AZ31 magnesium alloy sheets which are 0.5mm and 1.0mm thick, respectively, time arriving at target temperature and temperature variation in magnesium alloy sheet have been investigated. Sheet metals were mostly formed in simple shapes such as circular or rectangular. Few studies about forming of complex shapes were reported. Thus, the formability of magnesium alloy sheet for complex shapes is investigated. The process variable for a double sink shape deep drawing with circular and rectangular shape was investigated by varying temperature, velocities, and clearances. Accordingly, temperature, velocities, and clearances suitable for forming were suggested through investigating the thickness variation of the product.

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