간행물

대한금속재료학회(구 대한금속학회)> Metals and Materials International (MMI)

Metals and Materials International (MMI)

  • : 대한금속재료학회(구 대한금속학회)
  • : 공학분야  >  금속공학
  • : KCI등재
  • : SCI,SCOPUS
  • : 연속간행물
  • : 격월
  • : 1598-9623
  • : 2005-4149
  • : Metals and Materials(~2001)→Metals and Materials International (MMI)(2001~)

수록정보
수록범위 : 1권1호(1995)~14권6호(2008) |수록논문 수 : 1,183
Metals and Materials International (MMI)
14권6호(2008년 12월) 수록논문
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The unique and fascinating properties of one-dimensional (1D) ZnO nanostructures have triggered tremendous interest in exploring their possibilities for future electronic and photonic device applications. This paper provides current information on the progress of ZnO nanostructures grown by metalorganic chemical vapor deposition (MOCVD); it covers issues ranging from controlled synthesis of various ZnO nanostructures to their properties and potential applications. The unique features of MOCVD have been exploited to grow high-quality 1D ZnO nanostructures with tunable sizes, enabling the study of excitonic dynamics in low-dimensional nanostructures and size-dependent quantum confinement. A better understanding of the growth behaviors of ZnO nanostructures-particularly the anisotropic surface energy and adsorbate-surface interaction with regard to the crystal planes-allows control over the positions, morphologies, and surface polarities of the ZnO nanostructures as appropriate for device integration.

KCI등재 SCI SCOPUS

2Effect of Molybdenum and Chromium on Hardenability of Low-Carbon Boron-Added Steels

저자 : Fu Tao Han , Byoung Chul Hwang , Dong Woo Suh , Zuo Cheng Wang , Duk Lak Lee , Sung Joon Kim

발행기관 : 대한금속재료학회(구 대한금속학회) 간행물 : Metals and Materials International (MMI) 14권 6호 발행 연도 : 2008 페이지 : pp. 667-672 (6 pages)

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The hardenability of low-carbon boron-added steels containing molybdenum or chromium was studied using dilatometry, thermodynamic calculations, and secondary ion mass spectroscopy (SIMS). The combined addition of boron and molybdenum was found to be more effective than that of boron and chromium in enhancing the hardenability of boron-added steels. In particular, the addition of 0.5 wt.% molybdenum to the boron-added steel almost completely suppressed the formation of polygonal ferrite even at a slow cooling rate of 0.5℃/s. The synergistic effect of the combined addition of molybdenum and boron is thought to be due to both the suppression of M23(C,B)6 precipitation resulting from the deterioration of phase stability and the reduction of carbon diffusivity by the molybdenum addition.

KCI등재 SCI SCOPUS

3Oxygen Out-Diffusion in Partially Melted YBa2Cu3Oy-0.325Ag Superconductor at Reduced Oxygen Partial Pressure

저자 : Ju Hyung Kim , Hai Gun Lee

발행기관 : 대한금속재료학회(구 대한금속학회) 간행물 : Metals and Materials International (MMI) 14권 6호 발행 연도 : 2008 페이지 : pp. 673-678 (6 pages)

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In this study, we examined the chemical diffusion coefficient of oxygen out-diffusion (Dout) in partially melted YBa2Cu3Oy (Y123)-Ag superconducting tape produced by the thermomechanical processing of the silver-clad precursor (doped with 5 wt.% Ag) containing BaCuO2.5 at reduced oxygen partial pressure (Po2). The Dout value of Y123-Ag (O7.0 to O6.2), obtained by using the thermogravimetric relaxation technique at 950℃ and a Po2 of 0.28 kPa, was 1.0476 × 10(-7) ㎠/s.

KCI등재 SCI SCOPUS

4Mechanical Analysis of Woven Composites at High Strain Rates and Its Application to Predicting Impact Behavior

저자 : Han Sun Ryou , Kwan Soo Chung , Ji Ho Lim

발행기관 : 대한금속재료학회(구 대한금속학회) 간행물 : Metals and Materials International (MMI) 14권 6호 발행 연도 : 2008 페이지 : pp. 679-687 (9 pages)

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The deformation behavior of woven composites at high strain rates was analyzed using a constitutive equation developed to describe the nonlinear, anisotropic/asymmetric and rate-dependent mechanical behavior of woven composites. The rate-dependent nonlinear behavior of woven composites was characterized at high strain rates (1 s-1 to 100 s-1) using a tensile testing method first proposed in this research. The material properties for the developed constitutive equation were determined and subsequently used in a finite element analysis of the deformation behavior of woven composites at high strain rates. Finally, the impact behavior of woven composites was predicted using the constitutive equation and the results were compared with experiments, showing that the current constitutive equation including the characterization method is adequate to describe the deformation behavior of woven composites at high strain rates up to impact level.

KCI등재 SCI SCOPUS

5Effect of Impact Energy on the Impact-Wear Properties of Low Carbon High Manganese Alloy Steels in Corrosive Conditions

저자 : Kai Wang , Xiao Dong Du , Kuk Tae Youn , Yasunori Hayashi , Chan Gyu Lee , Bon Heun Koo

발행기관 : 대한금속재료학회(구 대한금속학회) 간행물 : Metals and Materials International (MMI) 14권 6호 발행 연도 : 2008 페이지 : pp. 689-693 (5 pages)

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The impact-wear properties of low carbon high manganese alloy steel were tested under three different impact energies (0.7 J, 1.2 J and 1.7 J) using a modified MLD-10 wear tester. SEM inspection of the wear surface and subsurface optical metallographic analysis reveal the impact wear mechanism. Under corrosive conditions we observe a shift from single micro-cutting to impact-flaking, after the appearance of vertical section micro-cracks, while at higher impact energies fatigue corrosion and abrasion are observed.

KCI등재 SCI SCOPUS

6Evolution and Mechanical Effect of S`-Phase in ECA Pressed Al-3.8Cu-1.2Mg-0.5Mn Alloys

저자 : Yong Lak Choi , Seon Hwa Kim

발행기관 : 대한금속재료학회(구 대한금속학회) 간행물 : Metals and Materials International (MMI) 14권 6호 발행 연도 : 2008 페이지 : pp. 695-699 (5 pages)

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The composition, morphology, and distribution of an Al-3.8Cu-1.2Mg-0.5Mn alloy precipitate formed during the ECAP process was investigated using XRD and TEM, and its mechanical properties were estimated via a SP test. A texture structure was formed at the initial state of the ECAP process, but an equiaxed structure was formed as the process progressed. The grain size was refined to around 100 nm through the ECAP process, and the morphology of the S` phase at the initial state is characterized by a rod shape in the grain boundary. As the number of passes increased, the S` phase assumed a spherical shape, with a diameter of 10 nm to 20 nm, and it was uniformly distributed in the internal grain boundary. Growth of the S` phase was also observed, and is thought to be due to Ostwald ripening. The results of the SP test show that the maximum load increased to above 60 %, indicating that changes in the size and distribution of the S` phase affect the alloy`s tensile strength.

KCI등재 SCI SCOPUS

7Transport Properties of Bi43Se4Te53 Thermoelectric Alloy Fabricated by Mechanical Grinding and Pulse Discharge Sintering

저자 : Woo Suk Choi , Bong Gyu Park , Ik Min Park , Yong Ho Park

발행기관 : 대한금속재료학회(구 대한금속학회) 간행물 : Metals and Materials International (MMI) 14권 6호 발행 연도 : 2008 페이지 : pp. 701-706 (6 pages)

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Mechanical grinding followed by pulse discharge sintering was applied to fabricate n-type Bi43Se4Te53 thermoelectric materials. Calorimetric measurements demonstrated that a Se-rich phase was developed from Bi2(Se, Te)3 phase after 10h of milling. However, when the milling time was extended to 25 h or longer, a Te-rich phase was formed. Hall measurements showed that the development of the Se/Te-rich phase considerably increased the carrier concentration but decreased the carrier mobility. The oxygen contamination in the smashed powders was also an important consideration for the degeneration of the figure of merit of the sintered samples.

KCI등재 SCI SCOPUS

8High Energy Pulsed Plasma Arc Synthesis and Material Characteristics of Nanosized Aluminum Powder

저자 : Kyoung Jin Kim

발행기관 : 대한금속재료학회(구 대한금속학회) 간행물 : Metals and Materials International (MMI) 14권 6호 발행 연도 : 2008 페이지 : pp. 707-711 (5 pages)

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Using a modified concept of an electrothermal gun powered by a high energy electrical pulse, aluminum nanopowder, whose average particle size ranges from 40 to 110 nm, has been synthesized by discharging and quenching aluminum plasma arc vapor in the argon gas. The characterization of produced aluminum nanopowder has been performed by using SEM, TEM, BET, XRD, and SAXS, and the results show the spherical aluminum nanoparticles with an amorphous oxide layer of passivation whose thickness is 2 nm to 3 nm. Thermal analysis of 44 nm and 80 nm aluminum nanopowders using TG and DSC shows that the aluminum nanopowder with a smaller particle size has increased reactivity during oxidation, such as a lower oxidation onset temperature. However, as the average particle size becomes smaller, the active aluminum content decreases rapidly, so 80 nm to 120 nm-sized aluminum nanopowder might be useful as an energetic material.

KCI등재 SCI SCOPUS

9Indirect Evaluation of the Long-Term Oxidation Properties of Al-21Ti-23Cr and Al-37Ti-12Cr Coating Materials for TiAl Alloy

저자 : J. K. Lee , S. H. Kim , D. M. Wee , K. Sharvan Kumar , M. H. Oh

발행기관 : 대한금속재료학회(구 대한금속학회) 간행물 : Metals and Materials International (MMI) 14권 6호 발행 연도 : 2008 페이지 : pp. 713-720 (8 pages)

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The most pertinent coating materials in the Al-Ti-Cr alloy system to improve the high temperature oxidation resistance of a TiAl alloy, with respect to oxidation properties, resistance to thermal stress, and chemical compatibility, are the two-phase alloys of Al-21Ti-23Cr (L12+Cr2Al) and Al-37Ti-12Cr (γ+TiAlCr). In this study, cyclic oxidation tests at 1000℃ and 1200℃ were performed for the specimens coated with both materials of 10 im thickness. Furthermore, breakaway oxidation caused by the formation of a rutile TiO2 scale was observed, though both bulk alloys showed very stable oxidation behavior. This phenomenon was resulted from the depleted Al content in the coating layer due to Al2O3 oxide growth and interdiffusion with the substrate. Considering the decrease of Al content due to oxide growth, the Al-21Ti-23Cr coating with the initial higher Al content was more effective for long-term oxidation protection of the TiAl alloy. On the other hand, when the Al content changes due to the interdiffusion with the substrate, the Al-37Ti-12Cr coating with a smaller compositional gradient with the TiAl substrate was more effective than the Al-21Ti-23Cr coating. Cyclic oxidation tests at 1000℃ and 1200℃ confirmed that for the longer lifetime of coating materials the initial Al content was more important than the smaller compositional gradient with the substrate. Consequently, the Al-21Ti-23Cr coating was considered as more effective one for the long-term oxidation resistance of TiAl alloys.

KCI등재 SCI SCOPUS

10Steam Oxidation and Surface Hardness of Power Plant Valve Materials Under the Ultra Super Critical Steam Condition

저자 : Ki O Song , Tong Yul Cho , Jae Hong Yoon , Chan Gyu Lee , Kee Sam Shin , Seon Ho Lee , Kee Won Urm , Jong Wook Lee , In Soo Kim

발행기관 : 대한금속재료학회(구 대한금속학회) 간행물 : Metals and Materials International (MMI) 14권 6호 발행 연도 : 2008 페이지 : pp. 721-727 (7 pages)

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Current supercritical steam power plants operate at 3,600 psi and 1,000°F. If the steam temperature is raised from 1,000°F (538℃) to 1,150°F (621℃), the efficiency increases by 2 %. Therefore, study on the high temperature corrosion of power plant materials under ultra-supercritical conditions (USC) is necessary to protect the plant from corrosion. In this study, valve materials of 17 % Cr martensitic steels (17Cr steel), Incoloy 901 (I901) and their surface nitrided specimens were exposed to USC of 621℃ and 3600 psi (255 kg/㎠) steam for 200℃, 400℃, and 800 h. The oxidation of both 17Cr steel and I901 under the USC for 800 h is very small due to the formation of a protective thin oxide layer formation on the surface. The USC oxidation of both nitrided specimens were increased due to the decomposition and formation of active nitrogen from the non protective nitrides such as Fe4N, Fe2-3N, and CrN. The oxidation of nitrided 17Cr steel (n17Cr steel) is about two times higher compared to nitrided I901 (nI901). The surface hardness is improved by more than two times near the surface by nitriding, and the degradation of hardness by USC oxidation is rapid for n17Cr steel, but slow for nI901.

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  • 3 현대자동차 (3건)
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