• Title/Summary/Keyword: 6061Al

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Evaluation of Thermal Conductivity for Screen-Printed AlN Layer on Al Substrate in Thickness Direction (알루미늄 기판에 스크린 인쇄한 AlN 후막의 두께 방향으로 열전도도 평가)

  • Kim, Jong-Gu;Park, Hong-Seok;Kim, Hyun;Hahn, Byung-Dong;Cho, Young-Rae
    • Journal of the Microelectronics and Packaging Society
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    • v.22 no.4
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    • pp.65-70
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    • 2015
  • A study on thermal properties for a single-layer metal and two-layer composites was investigated for the heat-sink application. For the single-layer metal, an aluminum alloy (Al6061) was selected. A screen printed aluminum nitride (AlN) layer on the Al6061 substrate was chosen for the two-layer composites. The thermal conductivity of the sample was determined from the thermal diffusivity measured by the light flash analysis (LFA), specific heat and density. Measured thermal property values were compared to calculated values using the data from the references. The thermal conductivity of composites with screen printed AlN layer on the Al6061 substrate decreased linearly with increasing the thickness of AlN layer. Measured values of the thermal conductivity for composites with $53{\mu}m$ and $163{\mu}m$ thick AlN layers were $114.1W/m{\cdot}K$ and $72.3W/m{\cdot}K$, respectively. In particular, the thermal conductivity of the screen-printed AlN layer was demonstrated by appling the rule of mixture in view point of thermal resistivity. Measured values of the thermal conductivity for AlN layers with the thickness of $53{\mu}m$ and $163{\mu}m$ showed $9.35W/m{\cdot}K$ and $12.40W/m{\cdot}K$, respectively.

A Study on Fracture Characteristics in Opening Mode of a DCB Specimen Using a Lightweight Material (경량 재료를 이용한 DCB 시험편의 열림 모드에서의 파손 특성에 관한 연구)

  • Kim, Jae-Won;Cho, Jae-Ung
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.20 no.1
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    • pp.42-47
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    • 2021
  • Recently, many structures using lightweight materials have been developed. This study was conducted by using Al6061-T6 and carbon fiber reinforced plastic (CFRP), two common lightweight materials. In addition, the failure characteristics of an interface bonded between a single material and a heterogeneous bonding material were analyzed. The specimens bonded with CFRP and Al6061-T6 were utilized by the combination of the heterogeneous bonding material. The specimens had a double cantilevered shape and the bonding between the materials was achieved by applying a structural adhesive. The experiments were conducted in opening mode: the lower part of the samples was fixed, while their upper part was subjected to a forced displacement of 3 mm/min by using a tensile tester. Under the tested amount of strength, energy release rate, and considering the specimens' fracture characteristics in opening mode, the specimen "CFRP-Al" presented the maximum stress, followed by "Al" and "CFRP". We can hence conclude that the inhomogeneous material "CFRP-Al" is useful for the construction of lightweight structures bonded with structural adhesive.

Hydroformability and mechanical properties of A16061 tubes on different extrusion type (알루미늄 6061 압출재의 제조공정에 따른 온간액압성형성과 기계적 특성 연구)

  • Yi, H.K.;Jang, J.H.;Kwon, S.O.;Lee, Y.S.;Moon, Y.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2007.05a
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    • pp.254-257
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    • 2007
  • In this study, hydroformability and mechanical properties of pre- and post- heat treated Al6061 tubes at different extrusion type were investigated. For the investigation, as-extruded, full annealed and T6-treated Al 6061 tubes at different extrusion type were prepared. To evaluate the hydroformability, uni-axial tensile test and free bulge test were performed at room temperature and $200^{\circ}C$. Also mechanical properties of hydroformed part at various pre- and post-heat treatments were estimated by tensile test. And the tensile test specimens were obtained from hexagonal prototype hydroformed tube at $200^{\circ}C$. As for the heat treatment, hydroformability of full annealed tube is 25% higher than that of extruded tube. The tensile strength and elongation were more than 330MPa and 12%, respectively, when hydroformed part was post-T6 treated after hydroforming of pre- full annealed tube. However, hydroformed part using T6 pre treated tube represents high strength and low elongation, 8%. Therefore, the T6 treatment after hydroforming for as-extruded tube is cost-effective. Hydroformability of Al6061 tube showed similar value for both extrusion types. But flow stress of seam tube showed $20{\sim}50MPa$ lower value.

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Thin Plate Fabrication and Characterization of Plain Woven Carbon / 6061 Al Composites (Plain woven carbon/6061Al 금속복합재료의 제조와 특성분석)

  • Chang Jae-Jun;Ha Dong-Ho;Eom Mun-Gwang;Lee Sang-kwan
    • Proceedings of the Korean Society For Composite Materials Conference
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    • 2004.04a
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    • pp.250-253
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    • 2004
  • Emphasis has been placed on thin plate fabrication of plain woven carbon fabric reinforced Al matrix composites using liquid pressing process. The composite has potential applications for PDP rear plate. The process is to use the low pressure for infiltration of Al melt into plain woven carbon fabric as the Al melt is pressurized directly. The minimum pressure required for the infiltration was calculated from force balance equation, permeability measurements and compaction behavior of carbon fiber. Also, the melting temperature and the holding time have been optimized. In order to measure coefficient of thermal expansion (CTE) of the composites, the thermal strain measurement using strain gage was performed and the thermal conductivity of the composites was measured using laser flash method. The constituent materials of the composite are PAN type carbon fibers as reinforcements and 6061 Al alloys as matrices.

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Forging Process with Al6061 Alloy Rheology Material by Electromagnetic Stirring System (전자교반을 응용한 Al6061 레오로지 소재의 단조공정)

  • Kang, S.S.;Oh, S.W.;Kang, C.G.
    • Transactions of Materials Processing
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    • v.16 no.6
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    • pp.443-446
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    • 2007
  • The semi-solid process has been developed near net-shape components for kinds of methods. Thixo-forming with reheating prepared billet and rheo-forming with cooled melt until semi-solid state. Material is applied electromagnetic stirring system to slurry with aluminum 6061 alloy. An experiment has variation factors which are pressure, solid-fraction, stirring current and stirring time. The mechanical properties are compared to forge sample with to apply heat treatment T6. This study is researched function a virtual pressure and fine shape zone. Optimum pressure is found to prevent defect of porosity.

Microstructures and Mechanical Properties of Al 6061/Gr Composites (Al6061/흑연 복합재료의 미세조직과 기계적 특성)

  • 김홍물
    • Journal of Powder Materials
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    • v.7 no.2
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    • pp.71-77
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    • 2000
  • A process has been successfully used to manufacture 6061/Graphite composite material and the Graphite particles are distributed uniformly within the Al alloy matrix. The 6061 powders was mixed with natural Graphite particles in a ball milling blender and cold compacted specimens were extruded into rods 15mm in diameter at 450$^{\circ}C$. The results showed that tensile properties of the composites with Graphite content have been reduced. The emergence of fine microstructures appeared to be related to the graphite volume. Heat-treated composites were found to possess good mechanical properties as compared with those of non heated composites. A model was used that the tensile strength of the composites would be estimated from the theoretical calculation and experimental data.

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A Process for the Control of Cell Size of 6061 Al foams by Multi-step Induction Heating Method (다출력 유도가열 공정을 이용한 다공질 6061 알루미늄 합금의 기공 제어 공정)

  • 윤성원;강충길
    • Transactions of Materials Processing
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    • v.12 no.5
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    • pp.449-456
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    • 2003
  • Multi-step induction heating process was applied to the powder compact melting technique as a new heating process to achieve pinpoint accuracy, faster cycle time, repeatability, non-contact and energy-efficient heat in a minimal amount of time. The objective of this study is the establishment of the input data diagram of multi step induction heating process for automation of the fabrication process of 6061 Al foams with desired density. At first, proper induction coil was designed to obtain a uniform temperature distribution over the entire cross sectional area of specimen. By using this coil, foaming experiments were performed to investigate the multi-step induction heating conditions such as capacity, temperature and time conditions of each heating and holding step. On the basis of the obtained multi-step induction heating conditions, relationship between final heating temperature and fraction of porosity was investigated.