• Title/Summary/Keyword: 6061Al alloy

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The Protection Potential Decision by Electrochemical Experiment of Al-Mg-Si Alloy for Ship in Seawater (해수용액에서 선박용 Al-Mg-Si 합금의 전기화학적 실험에 의한 방식전위 결정)

  • Jeong, S.O.;Park, J.C.;Han, M.S.;Kim, S.J.
    • Corrosion Science and Technology
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    • v.9 no.1
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    • pp.48-55
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    • 2010
  • The many vessels are built with FRP(Fiber-Reinforced Plastic) material for small boats and medium vessels. However, FRP is impossible to be used for recyclable material owing to environmental problems and causes large proportion of collision accidents because radar reflection wave is so weak that large vessels could not detect FRP ships during the sailing. Hence, Al alloy comes into the spotlight to solve these kinds of problems as a new-material for next generation instead of FRP. Al alloy ships are getting widely introduced for fish and leisure boats to save fuel consumption due to lightweight. In this study, it was selected 6061-T6 Al alloy which are mainly used for Al-ships and carried out various electrochemical experiment such as potential, anodic/cathodic polarization, Tafel analysis, potentiostatic experiment and surface morphologies observation after potentiostatic experiment for 1200 sec by using the SEM equipment to evaluate optimum corrosion protection potential in sea water. It is concluded that the optimum corrosion protection potential range is -1.4 V ~ -0.7 V(Ag/AgCl) for 6061-T6 Al alloy, in the case of application of ICCP(Impressed current cathodic protection), which was shown the lowest current density at the electrochemical experiment and good specimen surface morphologies after potentiostatic experiment for Al-Mg-Si(6061-T6) Al alloy in seawater environment.

Statistical Life Prediction of Fatigue Crack Growth for SiC Whisker Reinforced Aluminium Composite (SiC 휘스커 보강 Al6061 복합재료의 통계학적 피로균열진전 수명예측)

  • 권재도;안정주;김상태
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.19 no.2
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    • pp.475-485
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    • 1995
  • In this study, statistical analysis of fatigue data which had obtained from respective 24 fatigue crack, was examined for SiC whisker reinforced aluminium 6061 composite alloy (SiC$_{w}$/A16061) and aluminium 6061 alloy. SiC volume fraction in composite alloy is 25%. The analysis results stress intensity factor range and 0.1 mm fatigue crack initiation life for SiC$_{w}$/A16061 composite & A16061 matrix are the log-normal distribution. And regression analysis by linear model, exponential model and multiplicative model were performed to find out the relationship between fatigue crack growth rate(da/dN) and stress intensity for find out the relationship between fatigue crack growth rate(da/dN) and stress intensity factor range(.DELTA.K) in the SiC$_{w}$/A16061 composite and examine the applicability of Paris' equation to SiC$_{w}$A16061 composite. Also computer simulation was performed for fatigue life prediction of SiC$_{w}$/A16061 composite using the statistical results of this study.udy.

Preparation of SiC-Al alloy Composite by Pressureless Powder Packing Forming Method (분말 충전 성형법을 이용한 SiC-Al Alloy 복합체의 제조)

  • 박정현;송준광;백승수;염강섭;강민수
    • Journal of the Korean Ceramic Society
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    • v.34 no.4
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    • pp.343-350
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    • 1997
  • To fabricate the ceramic/metal(SiC/ Al alloy) composite, SiC preform was prepared by Pressureless Powder Packing Forming Method and 6061 Al alloy was infiltrated into the preform. Uniform compact having an average pore size of 10 ${\mu}{\textrm}{m}$ and narrow pore size distribution was prepared. Phenolic resin solution(40 wt%) was penetrated into the SiC compact, and then the compact was preheated at the temperature of 120$0^{\circ}C$. The pore size distribution and the microstructure of the preform were not changed by preheating. An uniform microstructure without any crack in the preform was obtained in SiC-Al alloy composite. The infiltration of 6061. Al alloy into the preform began at the temperature of 130$0^{\circ}C$ and the amount of infiltration increased in proportion to the infiltration temperature and the soaking time. The increasement rate of the infiltration amount decreased after 3 h. As a result of the infiltration at 140$0^{\circ}C$ for 4 h, Al alloy was well distributed in the interparticle channels and the relative density of the composite was above 98%. The strength and the fracture toughness of the composite were 303 MPa and 21.65 MPam1/2, respectively.

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Wear Mechanism of CrN Coating on Aluminum Alloys Deposited by AIP Method

  • Kim, Seock-Sam;Suh, Chang-Min;Murakami, Ri-ichi
    • KSTLE International Journal
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    • v.3 no.1
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    • pp.43-48
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    • 2002
  • Dry sliding wear and friction test of CrN coaling on two types of aluminum alloy substrates,6061 Al and 7075 Al deposited by arc ion plating, was peformed with a ball-on-disk tribometer. The effects of normal Bead and the mechanical properties of substrate on the friction coefficient and wear-resistance of CrN coating were investigated. The worn surfaces were observed by SEM. The results show that surface micro-hardness of CrN- coated 7075 Al is higher than that of CrN-coated 6061 Al. With an increase in normal lead, wear volume increases, while the friction coefficient decreases. The friction coefficient of CrN-coated 6061 Al is higher than that of CrN-coated 7075 Al, while the wear-resistance of CrN-coated 6061 Al is lower than the CrN-coated 7075 Al's, which indicates that the substrate mechanical properties have strong inf1uences on the friction coefficient and wear of CrN coating. The main wear mechanism was fragments of CrN coating, which were caused by apparent plastic deformation of substrate during wear test.

Mechanical Characteristics of Al 6061 Alloy with the Variation of Strain and Forming Speed (변형량 및 변형속도 변화에 따른 Al 6061합금의 특성 변화)

  • 권용남;권진욱;이영선;이정환
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2003.05a
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    • pp.88-91
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    • 2003
  • The forging of Al 6061 has been studied by using finite element analysis and real forging experiment to find out the effect of strain rate and strain on the final forged product. It seems to be well known that the mechanical properties depend on the microstructures of forged products. The hot deformation of Al alleys including Al 6061 has been researched quite a long period on the various aspects. However, the forging of Al alloys seem to have few information, especially the recrystallization, recovery and grain growth. To elucidate the process variables to control those microstuctual aspects the specially designed model was used for finite element simulation and forging experiments, in which the variation of strain and strain rate could be obtained. The effect of strain md strain rate has been related with the microstructures of forging stocks.

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Process Evaluation of Plasma-GMA Welding for Al 5052 and 6061 Alloy (Al 5052, 6061합금에 대한 플라즈마-GMA 용접공정특성 평가)

  • Kim, Cheol-Hee;Ahn, Young-Nam;Choi, Jin-Kang;Rhee, Se-Hun
    • Journal of Welding and Joining
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    • v.28 no.6
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    • pp.58-62
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    • 2010
  • In this study, the bead-on-plate welding were conducted by using GMA welding and plasma-GMA welding on Al 5052 and, Al 6061 plates. For these processes, the maximum welding speeds for full penetration were compared, and various weld qualities such as bead appearance, cross-section, cracks and porosities were examined. Faster welding speed, cleaner bead surface and more stable drop transfer could be achieved by plasma-GMA welding, compared with GMA welding.

The Thickness of Recrystallization Layer and Mechanical Properties According to Extrusion Exit Temperature (압출 출구 온도에 따른 Al 6061 합금의 표면 재결정층 두께 변화 및 기계적 특성 변화)

  • Kim, S.B.;Park, T.H.;Kim, H.G.;Lee, S.M.;Kim, H.K.
    • Transactions of Materials Processing
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    • v.30 no.5
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    • pp.219-225
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    • 2021
  • When extruding Al6061 alloys, deformation energy is deposited inside the extruded alloy depending on the deformation and the temperature of extrusion. This creates a Peripheral Coarse Grain (PCG) on the surface, where relatively more deformation energy. of the extruded alloy has been accumulated. Furthermore, since the deformation of materials continues while the materials recrystallize, it is important to examine the effect of deformation energy on dynamic recrystallization in the process of extruding Al alloys along with their microstructure. Prior studies explain the theory behind PCG growth though quantitative analysis on PCG growth of Al alloys during extrusion processes has not yet been addressed. This study aims to measure the generated PCG thickness which determines the correlation between extrusion outlet temperature and its effect on mechanical properties. Surface structure observations were performed using Optical Microscope (OM) and mechanical properties were evaluated through tensile strength and hardness measurement. Throughout this study, we endevoured to find the optimum condition of extrusion exit temperature of Al6061 and confirmed improved d reliability. This study describes the effect of the complex process variables such as exit temperature on the thickness of PCG layer for the Al6061 alloy using the 200 tons extrusion press. We therefore, discovered that the PCG layer thickness was 117 ㎛ at temperatures between 460 ℃ to 520 ℃.

Fabrication and Interface Properties of TiNi/6061Al Composite (TiNi 형상기억합금을 이용한 복합재료의 제조 및 계면 특성)

  • Kim, Sun-Guk;Lee, Jun-Hui
    • Korean Journal of Materials Research
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    • v.9 no.4
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    • pp.419-427
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    • 1999
  • TiNi shape memory alloy was shape memory heat-treated and investigated its mechanical properties with the variation of prestrain. Also 6061 Al matrix composites with TiNi shape memory alloy fiber as reinforcement have been fabricated by Permanent Mold Casting to investigate the microstructures and interface properties. Yield stress of TiNi wire was the most high in the case of before heat-treatment and then decreased as increasing heat-treatment time. In each heat-treatment condition, the yield stress of TiNi wire was not changed with increasing the amount of prestrain. The interface bonding of TiNi/6061Al composite was fine. There was a 2$\mu\textrm{m}$ thickness of diffusion reaction layer at the interface. We could find out that this diffusion reaction layer was made by the mutual diffusion. The diffusion rate from Al base to TiNi wire was faster than that of reverse diffusion and the amount of the diffusion was also a little more than that of reverse.

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A Study on the Characteristics on Ultra Precision Machining of Al6061-T651 (Al6061-T651의 초정밀 절삭특성에 관한 연구)

  • Kim, Geon-Hee;Yang, Sun-Cheol;Park, Yo-Chang
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.4 no.1
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    • pp.43-48
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    • 2005
  • This paper is described about the technique of ultra-precision machining for an aerospace aspheric mirror. The reflection mirror system generates parallel beams inside a thermal vacuum chamber. A 200mm diameter aspheric mirror was fabricated by SPDTM. Aluminum alloy as mirror substrates is known to be easily machined, but not polishable due to its ductility. Aspheric large reflector without a polishing process, the surface roughness of 10nm Ra, and the form error of ${\lambda}/2$ (${\lambda}$=632.8nm) for reference curved surface 200mm has been required. The purpose of this research is to find the optimum machining conditions for cutting reflector using Al6061-T651 and apply the SPDTM technique to the manufacturing of ultra precision optical components of Al-alloy aspheric reflector.

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