• 제목/요약/키워드: Al-Mg 합금

검색결과 542건 처리시간 0.023초

Al-Si-Mg 합금의 산소 및 황화수소 환경에서의 고온부식 특성 (High Temperature Corrosion Characteristics of Al-Si-Mg Alloy in O2 and H2S/H2 Environments)

  • 이영환;손영진;이병우
    • 동력기계공학회지
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    • 제21권2호
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    • pp.14-19
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    • 2017

  • The corrosion characteristics of Al-Si-Mg alloy were investigated in $O_2$ and $H_2S/H_2$ environments at high temperature. The weight gain and the reaction rate constant of the Al-Si-Mg alloy were measured in the oxygen and hydrogen sulfide environments at 773K. The weight gain of Al-Si-Mg alloy was showed parabolic increase in the oxygen and hydrogen sulfide environments. The reaction rate constants were confirmed to be $1.45{\times}10^{-4}mg^2cm^{-4}sec^{-2}$ in the oxygen environment and $6.19{\times}10^{-4}mg^2cm^{-4}sec^{-2}$ in the hydrogen sulfide environment respectively. As a result of XPS analysis on the specimen surface, $Al_2O_3$ and MgO compounds were detected in oxygen environment and $Al_2(SO_4)_3$ sulfate was detected in the hydrogen sulfide environment. Corrosion rate of Al-Si-Mg alloy was about 4.3 times faster in hydrogen sulfide environment than oxygen environment.

  • https://doi.org/10.9726/kspse.2017.21.2.014 인용 PDF KSCI

고강도 고인성 Al-Mg-Zn 주조합금의 미세조직 및 특성 (Microstructure and Properties of High Strength High Ductility Al-Mg-Zn Casting Alloy)

  • 김정민;하태형
    • 한국주조공학회지
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    • 제36권6호
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    • pp.181-186
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    • 2016

  • The typical microstructure of Al-5%Mg-2%Zn cast alloy mainly consists of an aluminum matrix with a small amount of AlMgZn 2nd phase. The secondary dendrite arm spacing and the grain size of the cast alloy tend to be inversely proportional to the section thickness of casting; however, the tensile properties cannot be said to be clearly related to the cast microstructure. After T6 heat treatment, the tensile strength of the alloy was enhanced significantly. TEM analysis results show that very fine AlMgZn precipitates were formed after the heat treatment. The corrosion resistance, measured according to the corrosion potential, was found to increase slightly after the conducting of heat treatment.

  • https://doi.org/10.7777/jkfs.2016.36.6.181 인용 PDF KSCI

Mg-Li-Al(-Zr) 합금의 연화현상 (The softening behavior of Mg-Li-Al(-Zr) alloys)

  • 김영우;황영하;임용진;김도향;홍준표
    • 열처리공학회지
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    • 제11권1호
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    • pp.10-16
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    • 1998

  • The softening behavior of squeeze cast Mg-Li-Al and Mg-Li-Al-Zr alloys have been investigated. The highest hardness values of Mg-Li-Al and Mg-Li-Al-Zr alloys were obtained after solution treatment at $400^{\circ}C$ for 1 hour. The hardness value, however, decreased as the aging temperature and time increased. Microstructural and calorometric analyses showed that quenched-microstructure changed from primary (${\alpha}$ and ${\beta}$)+secondary ${\alpha}$ to primary(${\alpha}$ and ${\beta}$)+secondary ${\alpha}+{\theta}$ after aging. The softening during aging was due to the coarsening of ${\theta}$ precipitates.

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알루미늄 카바이드 입자로 미세화된 Mg-Al 주조합금의 진동감쇠능 (Damping Capacity of Mg-Al Casting Alloy Refined by Aluminum Carbide Particles)

  • 전중환
    • 열처리공학회지
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    • 제20권6호
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    • pp.293-298
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    • 2007

  • Influences of aluminum carbide ($Al_4C_3$) addition on microstructure and damping capacity of Mg-3%Al casting alloy have been investigated based on experimental results of optical micrography, scanning electron microscopy with energy-dispersive spectrometry analysis and damping capacity measurement at RT. The addition of $Al_4C_3$ particles results in an efficient grain refinement. The damping capacity shows an increasing tendency with an increase in $Al_4C_3$ content. The damping value associated with $Al_4C_3$ particles is linearly dependent on the volume fraction of $Al_4C_3$ particles to the 2/3 power, $f_{2/3}$, which corresponds to the total surface area of the particles.

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