• 제목/요약/키워드: Cu-Be alloy

검색결과 415건 처리시간 0.027초

Al(Cu 1%)막의 플라즈마 식각후 부식 억제를 위한 $SF_6$ 처리시 fluorine passivation 효과 (The Effects of Fluorine Passivation on $SF_6$ Treatment for Anti-corrosion after Al(Cu 1%) Plasma Etching)

  • 김창일;권광호;백규하;윤용선;김상기;남기수
    • 한국전기전자재료학회논문지
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    • 제11권3호
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    • pp.203-207
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    • 1998
  • After etching Al-Cu alloy films using $SiCl_4/Cl_2/He/CHF_3$ plasma, a corrosion phenomenon on the metal surface has been studied with XPS (X-ray photoelectron spectroscopy) and SEM (Scanning electron microscopy). In Al-Cu alloy system, the corrosion occurs rapidly on the etched surface by residual chlorine atoms. To prevent the corrosion, the $SF_6$ plasma treatment subsequent to the etch has been carried out. A passivation layer is formed by fluorine-related compounds on etched Al-Cu alloy surface after $SF_6$ treatment, and the layer suppresses effectively the corrosion on the surface as the RF power of $SF_6$ treatment increases. The corrosion could be suppressed successfully with $SF_6$ treatment in the RF power of 150watts.

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Cu를 함유한 HSLA강의 미세 조직과 인성에 미치는 냉각 속도의 영향 (Effect of cooling rate on the microstructure and impact toughness of Cu-bearing HSLA steels)

  • 박태원;심인옥;김영우;강정윤;박화순
    • Journal of Welding and Joining
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    • 제13권2호
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    • pp.122-131
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    • 1995
  • The effects of cooling rate on the microstructures, precipitation of Cu-cluster, .epsilon.-Cu and impact toughness of high strength low alloy(HSLA) steel were studied using hardness tester, impact tester, DSC(differential scanning calorimetry), AES(auger electron spectroscopy) and TEM(transmission electron microscopy). Not only the Cu-precipitates but also the segregation of Cu, As, Sb, P, S, N, Sn along grain boundary were not observed at the specimens heat treated from 800.deg. C to 300.deg. C with the cooling time of 12-125 sec. The Cu-cluster, .epsilon.-Cu are formed by introducing ageing after cooling and the effect of precipitates on hardening increase after cooling was the same in all cooling rate. The peak hardness was obtained at an ageing of 500.deg. C in all cooling conditions. The impact energy become higher as the cooling time increases. This fact can be explained to be due to the tempering effect applied on the cooling stage since the present alloy has a relatively high Ms temperature and the local high concentration of the retained austenite.

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Al-Li-Cu-Mg-Zr 합금에 있어서 δ'상 조대화를 위한 Lithium의 확산계수 평가 (The Evaluation of Diffusivity of Lithium for Coarsening of δ' Precipitate in AI-Li-Cu-Mg-Zr Alloy)

  • 정동석;김은호;조현기
    • 열처리공학회지
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    • 제7권1호
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    • pp.17-24
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    • 1994
  • The evaluation and analysis of diffusivity of lithium for coarsening and coarsening kinetics of ${\delta}^{\prime}$ precipitate in Al-Li-Cu-Mg-Zr alloy aged at $170^{\circ}C$ have been investigated by transmission electron microscopy. With ageing time, ${\delta}^{\prime}$ precipitate coaesened to followed $\bar{\gamma}{\propto}t^{1/3}$ and coarsening kinetics was found to be obeyed to the Lifshitz-Slyozov-Wagner(LSW) theory and diffusivity of lithium for coarsening of ${\delta}^{\prime}$ precipitate in Al-Li-Cu-Mg-Zr alloy was obtained to be $5.85{\times}10^{-17}{\sim}1.53{\times}10^{-16}$ by experimental coarsening rate constant and various coarsening kinetic theory. Diffusivity of lithium measured by using various model but MLSW and Tsumuraya (VI) et al. model in Al-Li-Cu-Mg-Zr alloy is similar to that calculated by the Costas's diffusivity equation. It was, therefore, suggested that additing to the Cu, Mg and Zr element in Al-Li system have no great effect on diiffusivity of lithium for coarsening of ${\delta}^{\prime}$ This suggest that in matrix.

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AlZnMgCu0.5 합금의 Electron Beam 용접성에 관한 연구 (Investigations on electron beam weldability of AlZnMgCu0.5 alloys)

  • 배석천
    • Journal of Welding and Joining
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    • 제15권4호
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    • pp.166-177
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    • 1997
  • The high strength AlZnMgCu0.5 alloy is a light metal with good age hardenability, and has a high tensile and yielding strength. Therefore, it can be used for structures requiring high speciple strength. Even though high strength AlZnMgCu alloy has good mechanical properties, it has a lot of problems in TIG and MIG welding processes. Since lots of high heat absorption is introduced into the weldment during TIG and MIG processes, the microstructural variation and hot cracks take place in heat affected zone. Therefore, the mechanical properties of high strength AlZnMgCu0.5 alloy can be degraded in weldment and heat affected zone. Welding process utilizing high density heat source such as electron beam should be developed to reduce pore and hot cracking, whichare usually accompanied by MIG and TIG welding processes. In this work, electron beam welding process were used with or without AlMg4.5Mn as filler material to avoid the degradation of mechanical properties. Mechanical and metallurgical characteristics were also studied in electron beam weldment and heat affected zone. Moreover hot cracking mechanism was also investigated.

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Zr-Ti-Cu-Ni-Be 합금으로 제조된 상용 골프클럽헤드의 부위별 물리적 특성 및 기계적 거동 (Mechanical Behavior and Physical Properties of Zr-Ti-Cu-Ni-Be Amorphous and Partially Crystallized Alloy Extracted from a Commercial Golf Club Head)

  • 최영철;홍순익
    • 한국재료학회지
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    • 제15권11호
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    • pp.697-704
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    • 2005
  • The deformation behavior of a bulk amorphous and crystallized amorphous $Zr_{22.5}Ti_{14}Cu_{12.5}Ni_{10}Be_{22.5}$ alloy extracted from a commercial golf club head was characterized at room temperature ana $300^{\circ}C$. At room temperature, amorphous specimens revealed higher yield stress and ductility than partially crystallized alloy specimens. Amorphous alloy displayed some plasticity before fracture, which resulted from strain hardening and repeated crack initiation and propagation. The fracture is mainly localized on one major shear band, and the compressive fracture angle of the amorphous specimen between the stress axis and the fracture plane was about $40^{\circ}$ Scanning electron microscope observations revealed mainly a vein-like structure in the amorphous alloy But the fracture surface of partially crystallized amorphous alloy consisted of vein-like and featureless fracture structure. The partially crystallized alloy extracted from the thick part of the club fractured in the elastic region, at a much lower stress level than the amorphous, suggesting that relatively coarse crystal particles formed during cooling cause the brittle fracture.

Al6Si2Cu 알루미늄 합금의 기계적 물성 향상을 위한 이단계 고용화 열처리 (Two-step Solution Treatment for Enhancement of Mechanical Properties of AlSiCu Aluminum Alloy)

  • 박상규;김정석
    • 열처리공학회지
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    • 제31권3호
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    • pp.97-103
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    • 2018
  • The objective of this study is to develop the mechanical properties of AlSiCu aluminum alloy by the two-step solution heat treatment. The microstructure of gravity casting specimen represents a typical dendrite structure having a secondary dendrite arm spacing (SDAS) of 40 mm. In addition to the Al matrix, a large amount of coarsen eutectic Si phase, $Al_2Cu$ intermetallic phase, and Fe-rich phases are generated. The eutectic Si phases are fragmented and globularized with solution heat treatment. Also, the $Al_2Cu$ intermetallic phase is resolutionized into the Al matrix. The $2^{nd}$ solution temperature at $525^{\circ}C$ might be a optimum condition for enhancement of mechanical properties of AlSiCu aluminum alloy.

NiTiCu 형상기억합금의 피로특성 (Fatigue Characterization of NiTiCu Shape Memory Alloys)

  • 한지원;박성범
    • 한국안전학회지
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    • 제29권4호
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    • pp.28-33
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    • 2014
  • Recently, the actuator worked by the driving recovery-force of the thermo elastic martensitic transformation of shape memory alloys(SMA) has been studied. This paper presents a study on the fatigue life of shape memory alloy (SMA) actuators undergoing thermally induced martensitic phase transformation under various stress levels. shape memory recoverable stress and strain of Ti-44.5at.%Ni-8at.%Cu alloys were by means of constant temperature tensile tests. Differential scanning calorimetry (DSC) was employed in order to investigate the transformation characteristics of the alloy before the tests. the results were summarized as follows. The martensite inducing stress incerased with the increasing of the Cu-contents. The fatigue life decreased with the increasing of the test load and the Cu-content. The data acquired will be very useful during the design process of an SMA NiTiCu element as a functional part of an actuator.

유압 서보실린더의 동합금 피스톤 헤드와 부시의 마멸특성에 관한 실험적 연구 (A Experimental Study on Wear Characteristics of Cu Alloy for Piston Head and Bush Material of Hydraulic Servo Cylinder)

  • 조연상;김영희;변상민;박흥식
    • Tribology and Lubricants
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    • 제25권5호
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    • pp.330-334
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    • 2009
  • Hydraulic servo cylinders have been used to control accurately a large machine in power plant. Especially, Piston head and bush of servo cylinder is assembled sleeve and piston head and bush made of Cu alloy and pad sealing part. A damages of sleeve and piston head, bush are caused by friction and wear. Thus, It is necessary to examine friction and wear characteristics of Cu alloys for the piston head and bush. In this study, to be reliable on the piston and cylinder parts, dry friction and wear experiments were carried out with Cu alloys of four kinds of AlBC, PBC, BC and BS using reciprocating friction tester of pin on disk type. From this study, the result was shown that the AlBC and PBC with alloy elements were excellent to resistance wear. As the sliding speed was increased, the wear loss of PBC decreased than another Cu alloy.

아말감과 이종(異種)금속의 거리에 따른 부식에 대한 고찰 (A Study on Corrosion according to Distance between Amalgam and Dissimilar Metals)

  • 김주원;정은경
    • 치위생과학회지
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    • 제4권3호
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    • pp.103-109
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    • 2004
  • 본 실험은 제조회사 매뉴얼과 통법에 의해서 Amalgam 합금, Ni-Cr alloy의 Crown용 Verabond, Denture용 Talladium $^{TM}alloy$로 각각 24개의 총 72의 시편을 하악 제1대구치근 원심 치관 폭경과 임상에서의 MOD cavity를 고려하여 제작하였고 인공 타액 80ml를 담은 200ml 용 비이커에 시편을 넣어 0mm, 7mm, 40mm 거리에서 7일 후 갈바닉 부식을 측정하였다. 유리금속은 유도 플라즈마 방출 분광기(Inductively Coupled Plasma - Atomic Emission Spectrometer(ICP-AES, JY-50P, VG Elemental Co. France)로 전해액내의 Cu, Ag, Ni, Cr, Sn, Zn, Hg를 정량 분석했으며 그 결과 다음과 같은 결론을 얻었다. 첫째, Cu, Sn, Ag, Hg, Zn은 아말감이 금 합금과 접촉했을 때가 크라운용 Ni-Cr alloy와 덴쳐용 Talladium alloy 보다 아주 많이 유리 했으며 금 합금이 구강조직과 생체 적합성이 가장 좋다지만 아말감과 함께 있을 때 가장 불리 했슴을 알 수 있었다. 둘째, 아말감이 금 합금과 접촉했을 때, 금 합금의 조성에서 Ni, Cr 같은 중금속이 함유되지 않았기 때문인지 전혀 유리되지 않았으나 Sn은 조성에는 없었지만 $227.1{\pm}18.0035{\mu}g/cm^2$나 유리 되었고 Hg도 유리되었는데 이는 아말감 자체의 유리 물질임을 추측할 수 있었다. 셋째, 아말감 합금과 금 합금 사이에서의 0mm, 7mm, 40mm 거리에서는 Cu, Ag는 유의성이 있었으며 Hg는 유의성이 없었다. 이는 금합금은 절대 아말감과 같이 사용해서 안되며 이종 보철물 사이의 거리에 관계없이 사용을 금해야 하는 것으로 사료된다. 넷째, 아말감합금이 Crown용 Ni-Cr 합금과 접촉했을 때 아말감의 Ag이 유리 되지 않았으며 Zn, Ni, Sn, Hg, Cu의 순으로 유리되었다. 0mm, 7mm, 40mm 거리에 따라서 유의성이 있었다. Hg는 유리 되지 않았지만 중금속인 Ni, Cr은 유리되었고 반대 악궁이나 거리가 떨어져 있으면 접촉보다 Hg의 유리가 적었다. 다섯째, 아말감합금이 Denture용 Talladium alloy 합금과 접촉했을 때 0mm, 7mm, 40mm 거리에서도 유의성이 있었다. 0mm, 7mm, 40mm 거리에 따라서 유의성이 있었다. Hg는 유리 되지 않았지만 중금속인 Ni, Cr은 유리되었고 반대 악궁이나 거리가 떨어져 있으면 접촉보다 Hg의 유리가 적었다. 여섯째, 인공 타액에서 접촉 시 Amalgam alloy와 Gold, Verabond, Talladium alloy의 Cu, Sn, Ag, Hg, Zn, Ni, Cr의 ICPES 검사 결과 Cu, Hg가 유의성을 있었다. 일곱째, 인공타액에서 아말감합금과 두 비귀금속인 Ni-Cr alloy(crown용), Denture용 Talladium alloy가 접촉한 경우 거리에 따른 Hg, Ni, Cr의 유리 부산물에서 유의성을 확인했다.

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소성가공이 가능한 고강도 Cu-Zr 복합재료 (Mechanically Workable High-strength Cu-Zr Composite)

  • 신상수;임경묵;김억수;이재철
    • 대한금속재료학회지
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    • 제50권4호
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    • pp.293-299
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    • 2012
  • Ultrafine-grained or nanostructured alloys usually lack the strain hardening capability needed to sustain uniform tensile deformation under high stresses. To circumvent this problem, we fabricated the Cu-based composite reinforced with the 3-dimensionally interconnected $Cu_5Zr$ phase using the combined technique of rapid quenching and subsequent hot-rolling. The alloy exhibited a tensile ductility of ~2.5% together with a strength of 1.57 GPa, which exceeds the values of most commercially available Cu-Be alloys. In this study, we elucidated the structural origin of the high strength and tensile ductility of the developed alloy by examining the thermal stability of the $Cu_5Zr$ reinforcing phase and the energy (work) absorption capability of the Cu matrix.