• 제목/요약/키워드: aluminum alloys

검색결과 655건 처리시간 0.022초

알루미늄 합금(AC4C.1)의 환경친화적 고속가공 특성 (Environmentally Conscious High Speed Machining Characteristics of Aluminum Alloys(AC4C.1))

  • 배정철;황인옥;강익수;김정석;강명창
    • 한국기계가공학회지
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    • 제3권1호
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    • pp.22-27
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    • 2004
  • Recently, environmental pollution has become a significant problem in industry and many researchers have investigated in order to preserve the environment. Environmentally conscious machining and technology have more important position in machining process, because cutting fluid has bad influence on the environment in milling process. This research is the experimental study on high speed machining of aluminum alloys through environmentally conscious machining. In this study, the surface roughness and chip appearance was investigated in the machining of aluminum alloys by dry machining, using cutting fluid and oil mist.

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마그네슘합금의 레이저 절단가공 특성에 관한 연구 (A Study on the Laser Cutting Characteristics of Magnesium alloys)

  • 정한별;김형선
    • 공학기술논문지
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    • 제11권4호
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    • pp.227-235
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    • 2018
  • Studies on the laser cutting processing characteristics of magnesium alloys can be divided into three parts, comparing the cutting faces of magnesium alloy and aluminum alloy, observing the shape of the corner where straight lines meet, and observing the straight lines and arcs. First, there were no laser cutting conditions for magnesium alloys, so it was observed to cut magnesium alloy and aluminum alloy under the same processing conditions as aluminum alloy to shape and surface of the cut surface. Next, to observe the characteristics of the corner, we observed the shape of the corner according to the angle change of the part where the two lines meet, and finally we observed various angles to observe the characteristics of the part where the arc meets the line. Finally, laser cutting processing characteristics of magnesium alloys and aluminum alloys obtained based on the above study contents were summarized.

쌍롤 주조법에 의해 제조한 알루미늄 합금의 미세조직 (Microstructures of Twin Roll Cast Aluminum Alloys)

  • 박종우;김희수;백남익
    • 한국주조공학회지
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    • 제16권2호
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    • pp.149-157
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    • 1996
  • Several aluminum based alloys were fabricated by a twin roll strip casting mill. As-cast microstructures and microsegregations of these aluminum alloys were investigated by means of optical microscope, scanning electron microscope and electron probe micro analysis. Clear distinction on microsegregation among the alloy systems was observed, that is, A1235 and A8011 alloys showed diffused segregation in the middle of the strip, while A3003 and A5086 alloys revealed a centerline segregation consisted of lamellar structure. Above center line segregation was resulted from enrichment of the alloying elements such as Mn, Fe, Cu, Si and eutictic reaction in central region of the alloy strip.

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전자기 듀오캐스팅으로 제조한 Al-Mn/Al-Si 하이브리드 알루미늄합금의 미세조직과 인장 특성 (Microstructure and Tensile Properties of Al-Mn/Al-Si Hybrid Aluminum Alloy Prepared by Electromagnetic Duo-Casting)

  • 박성진;;김종호;박준표;장시영
    • 한국재료학회지
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    • 제22권2호
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    • pp.97-102
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    • 2012
  • The microstructure and tensile properties of Al-Mn/Al-Si hybrid aluminum alloys prepared by electromagnetic duocasting were investigated. Only the Al-Mn alloy showed the typical cast microstructure of columnar and equiaxed crystals. The primary dendrites and eutectic structure were clearly observed in the Al-Si alloy. There existed a macro-interface of Al-Mn/Al-Si alloys in the hybrid aluminum alloys. The macro-interface was well bonded, and the growth of primary dendrites in Al-Si alloy occurred from the macro-interface. The Al-Mn/Al-Si hybrid aluminum alloys with a well-bonded macro-interface showed excellent tensile strength and 0.2% proof stress, both of which are comparable to those values for binary Al-Mn alloy, indicating that the strength is preferentially dominated by the deformation of the Al-Mn alloy side. However, the degree of elongation was between that of binary Al-Mn and Al-Si alloys. The Al-Mn/Al-Si hybrid aluminum alloys were fractured on the Al-Mn alloy side. This was considered to have resulted from the limited deformation in the Al-Mn alloy side, which led to relatively low elongation compared to the binary Al-Mn alloy.

알루미늄 튜브 온간 하이드로포밍 성형성에 관한 연구 (Studies on the Warm Hydroformability of Aluminum Tubes)

  • 김봉준;류종수;김대현;김동우;문영훈
    • 한국소성가공학회:학술대회논문집
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    • 한국소성가공학회 2004년도 춘계학술대회 논문집
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    • pp.198-201
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    • 2004
  • Aluminum alloys have high potential for weight reduction in automotive and other applications. But aluminum alloys have relatively low tubular hydroformability which can be enhanced by conducting the hydroforming at elevated temperatures. Hot working processes are commonly used in bulk forming such as forging and rolling, but still is rare in sheet metal forming like hydroforming. In this study hydroforming test at elevated temperatures is performed by special designed induction heating system to investigate the hydroformability of aluminum alloys. The high temperature formability characteristrics are obtained by 1?fitting forming test and circular bulging test and the effects of the process parameters such as feeding amount, internal pressure and temperatures on the tubular forming limits are mainly investigated.

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SiC 입자로 분산 강화된 고력 알루미늄 합금 복합재료의 기계적 성질 (Mechanical Properties of High Strength Aluminum Alloy Composites Reinforced by SiC Particulates)

  • 이의길;최운;남승의
    • 한국주조공학회지
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    • 제17권2호
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    • pp.164-169
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    • 1997
  • Mechanical properties of aluminum-matrix composites, fabricated by dispersion of fine SiC particulates of which size was less than 1 ${\mu}m$ into 2024 and 7075 aluminum alloys, have been investigated. Homogeneous mixing between the matrix and SiC particulates could be achieved by jar milling for 8 hours with appropriate processing agent. At temperatures below 473K, high-temperature tensile strength of the composites was higher than that of the 2024 and 7075 aluminum alloys which were used as matrix materials. However, tensile strength of the composites was approximated to that of the matrix materials at 573K. Thus, it could be suggested that effects of particle dispersion on tensile strength of aluminum alloys was diminished at temperatures higher than 573K.

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알루미늄에 대한 미세 표면 전해가공에 관한 연구 (A study on the Micro Surface Electrochemical Machining for Aluminum Alloy)

  • 백승엽;이은상;원찬희
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2002년도 추계학술대회 논문집
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    • pp.214-217
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    • 2002
  • Micro Surface Electrochemical Machining has traditionally been used in highly specialized fields such as those of the aerospace and defense industries. It is now increasingly being applied in other industries where parts with difficult-to-cut material, complex geometry and tribology such as compute. hard disk drive(HDD) are required. Pulse Electrochemical Micro-machining provides an economical and effective method for machining high strength, high tension, heat-resistant materials into complex shapes such as turbine blades of titanium and aluminum alloys. Usually aluminum alloys are used bearings to hard disk drive in computer. In order to apply aluminum alloys to bearing used in hard disk drive, this paper presents the characteristics of Micro Surface Electrochemical machining for aluminum alloy.

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A Review on Dielectric Breakdown of Anodic Oxide Films on Aluminum Alloys

  • Hien Van Pham;Cheolnam Yang;Sungmo Moon
    • 한국표면공학회지
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    • 제57권4호
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    • pp.254-264
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    • 2024
  • This paper reviews the dielectric breakdown resistance and behavior of anodic oxide films in air environment. It begins with a description of the dielectric breakdown mechanisms of dielectric materials. The paper then introduces different types of dielectric materials and compares them in terms of dielectric strength, thermal conductivity, mechanical strength and cost. Next, the paper summarizes various fabrication methods for dielectric aluminum oxide layers, discussing the advantages and disadvantages of each method. Finally, it provides an overview of current studies on the dielectric breakdown properties of anodic aluminum oxide films formed on different aluminum alloys in various electrolytes.

알루미늄 5052 및 6061 합금의 양극산화 표면처리를 통한 발수 특성 및 부식 특성 비교 (Comparison of Hydrophobicity and Corrosion Properties of Aluminum 5052 and 6061 Alloys After Anodized Surface Treatment)

  • 박영주;정찬영
    • Corrosion Science and Technology
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    • 제21권3호
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    • pp.200-208
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    • 2022
  • Aluminum alloy is used by adding various elements according to the needs of the industry. Aluminum alloys such as 5052 and 6061 are known to possess excellent corrosion resistance by adding Mg. Despite their excellent physical properties, corrosion can occur. To solve this problem, an anodization technique generally can improve corrosion resistance by forming an oxide structure with maximized hydrophobic properties through coatings. In this study, the anodizing technique was used to improve the hydrophobicity of aluminum 5052 and 6061 by creating porous nanostructures on top of the surface. An oxide film was formed by applying anodizing voltages of 20, 40, 60, 80, and 100 V to aluminum alloys followed by immersion in 0.1 M phosphoric acid for 30 minutes to expand oxide pores. Contact angle and corrosion characteristics were different according to the structure after anodization. For the 5052 aluminum, the corrosion potential was improved from -363 mV to -154 mV as the contact angle increased from 116° to 136°. For the 6061 aluminum, the corrosion potential improved from -399 mV to -124 mV when the contact angle increased from 116° to 134°.

알루미늄 합금에서 Zr첨가가 TiB2의 변형과 결정립크기에 미치는 영향 (Influence of Zr Addition on TiB2 Modification and Grain Size in Aluminium Alloys)

  • 강원덕;박현균
    • 대한금속재료학회지
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    • 제49권8호
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    • pp.619-627
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    • 2011
  • The poisoning effect of Zr in aluminum alloys was investigated by analyzing the filtered cakes of aluminum alloy melt taken with the $Prefil^{(R)}$ footprinter through a variety of analytic instruments, SEM/EDX, Auger, and TEM. Experimental results indicated that the morphology and chemical composition of the aluminum alloys were not modified with the addition of Zr, which is to previous belief that Zr poisoning is caused by modification of $(Ti_{1-x}Zr_x)Al_3$. On the other hand, $TiAl_3$ surroundig $TiB_2$ particles was modified and its lattice parameter was more mismatched by increasing Zr content, leading to less nucleation rate. This is also supported by the observation that the poisoning effect is reduced when Ti is added, resulting in a lower content ratio of Zr to Ti. These results suggest that extra Ti should be added to eliminate the poisoning effect of Zr in aluminum alloys containing Zr.