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Materials science & engineering. properties, micro... 52건

  1. [해외논문]   Editorial Board   SCI SCIE


    Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685 ,pp. IFC - IFC , 2017 , 0921-5093 ,

    초록

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  2. [해외논문]   Creep behaviors evaluation of Incoloy800H by small punch creep test   SCI SCIE

    Yang, Sisheng (School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China ) , Ling, Xiang (School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China ) , Zheng, Yangyan (School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816, China)
    Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685 ,pp. 1 - 6 , 2017 , 0921-5093 ,

    초록

    Abstract In this paper, creep properties estimation of Incoloy800H under various loads and temperatures were performed experimentally and analytically. Compared to standard creep test, a similar creep character could be obtained by small punch creep test. On the basis of geometrical shape of deformed specimen, we proposed a modified geometrical model. The relatively simple yet accurate correlation between strain and small punch deflection was established. The reference stress under multi-axial deformation state was discussed and proved to be as constant at the identical condition. Additionally, to analyze the tertiary deformation and fracture mechanism of small punch creep test, creep damage tolerance factor was introduced and modified. The results indicated that necking and precipitate coarsening was the domain model in this phase. Meanwhile, the physical significance of three stages of deflection-time (D-T) curve was proved to be different with that of uniaxial creep curve.

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  3. [해외논문]   Measurement and modelling of textures in flow formed Cr-Mo-V steel tubes   SCI SCIE

    Tsivoulas, D. (School of Materials, The University of Manchester, Manchester M13 9PL, UK ) , da Fonseca, J. Quinta (School of Materials, The University of Manchester, Manchester M13 9PL, UK ) , Tuffs, M. (Rolls-Royce plc, Derby DE24 8BJ, UK ) , Preuss, M. (School of Materials, The University of Manchester, Manchester M13 9PL, UK)
    Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685 ,pp. 7 - 18 , 2017 , 0921-5093 ,

    초록

    Abstract Flow formed components undergo a complex deformation mode under biaxial strain, which is expected to have significant impact on the crystallographic texture evolution. X-ray diffraction measurements and calculations of orientation distribution functions (ODFs) were employed to analyse flow formed tubes produced with different parameters such as preform hardness, feed rate, roller contact angle, and wall thickness reduction. Texture variations were observed both throughout the wall thickness and along the tube length. A crystal plasticity finite-element model was used to decipher the texture formation relative to the imposed axial and hoop strains. The shear strain on the axial-hoop plane was found to be responsible for the deviation from cold rolling textures and the formation of a fibre along Φ = 0° in the φ 2 = 45° ODF section. Finally, annealing treatments at 700°C were carried out to monitor texture changes due to potential recrystallisation effects during the forming process, upon which strengthening of the {113} orientation was noted.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  4. [해외논문]   Mechanical alloying via high-pressure torsion of the immiscible Cu50Ta50 system   SCI SCIE

    Ibrahim, Nazar (Corresponding authors. ) , Peterlechner, Martin (Corresponding authors.) , Emeis, Friederike , Wegner, Matthias , Divinski, Sergiy V. , Wilde, Gerhard
    Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685 ,pp. 19 - 30 , 2017 , 0921-5093 ,

    초록

    Abstract Mechanical alloying via high pressure torsion (HPT) is studied for the immiscible Cu-Ta system. Stacks of alternating 25μm thick sheets of pure Cu and Ta were subjected to HPT processing at a pressure of 4GPa for 10, 30, 50, 100 and 150 revolutions, respectively. The effect of subsequent heat treatment on the phase composition and microstructure evolution of Cu/Ta and pure Cu or pure Ta foil stacks is examined by X-ray diffraction, scanning and transmission electron microscopy and microhardness measurements. The HPT processing of the Cu/Ta assembly by 150 revolutions is shown to produce a mixture of ultrafine grains corresponding to a Cu-16% Ta solid solution with embedded nano-scaled Ta-rich particles and almost pure Ta grains. The microstructure reveals a superior thermal stability and remains fine-grained even after annealing at 1000°C for 1h. HPT deformation of pure Cu stacks results in formation of a mixture of pure Cu and CuO, presumably due to availability of numerous interfaces in the assembly, with the existence of the copper mono-oxide being verified by X-ray measurements.

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  5. [해외논문]   Spheroidization of primary Mg2Si in Al-20Mg2Si-4.5Cu alloy modified with Ca and Sb during T6 heat treatment process   SCI SCIE

    Yu, Hong-Chen (Corresponding author.) , Wang, Hui-Yuan , Chen, Lei , Zha, Min , Wang, Cheng , Li, Chao , Jiang, Qi-Chuan
    Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685 ,pp. 31 - 38 , 2017 , 0921-5093 ,

    초록

    Abstract The morphology evolution of primary Mg 2 Si particles in a Al-20Mg 2 Si-4.5Cu alloy both unmodified and modified with 0.5wt% Ca-Sb prepared by hot-extrusion followed by T6 heat treatment was investigated in the present study. Interestingly, we found that the combination of hot-extrusion and T6 heat treatment was efficient in transforming truncated octahedral primary Mg 2 Si into sphere in the modified alloy. In contrast, the primary Mg 2 Si particles still kept dentritic in the unmodified alloy. It suggested that the formation of truncated octahedral primary Mg 2 Si particles in as-cast state, the fragmentation of particles by hot-extrusion and the enhanced solid-state diffusion of Si and/or Mg atoms during heat treatment were responsible for the spheroidization of primary Mg 2 Si. Moreover, the existence of fine (~10–20μm) spherical primary Mg 2 Si played an important role in strengthening the alloy, i.e., the ultimate tensile strength (UTS) increased from ~227MPa in the unmodified alloy to ~303MPa in the modified one. It is because the fine spherical primary Mg 2 Si particles can provide a higher fracture stress and strength of the matrix/particle interface. Our study offered a simple methodology to prepare spherical primary Mg 2 Si in an Al-high Mg 2 Si alloy, which is beneficial to design novel light-weight Al-Mg-Si alloys with improved mechanical properties.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  6. [해외논문]   Effect of normalization and tempering on microstructure and mechanical properties of V-groove and narrow-groove P91 pipe weldments   SCI SCIE

    Pandey, Chandan (Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee, Uttarakhand 247667, India ) , Mahapatra, M.M. (School of Mechanical Sciences, Indian Institute of Technology Bhubaneswar, Odisha 751013, India ) , Kumar, Pradeep (Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee, Uttarakhand 247667, India ) , Saini, N. (Department of Mechanical and Industrial Engineering Indian Institute of Technology Roorkee, Uttarakhand 247667, India)
    Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685 ,pp. 39 - 49 , 2017 , 0921-5093 ,

    초록

    Abstract In Very High Temperature Reactor (VHTR), The Nb-V modified 9Cr-1Mo (P91) creep strength enhanced ferritic (CSEF) steel is currently considered as a candidate material for reactor internals and reactor pressure vessels (RPVs). After the welding of P91 steel, the inhomogeneous microstructure of weldment is a serious issue because it promotes the well-known Type IV cracking in P91 weldments. The present research work is focused on how the microstructure evolve in various zone of P91 pipe weldment during the sub-critical post weld heat treatment (PWHT) and normalized and tempered (N&T) heat treatment. The effect of PWHT and N&T heat treatment are also considered on tensile properties and hardness variation of P91 weldments. To characterize the sample scanning electron microscope (SEM), X-ray diffraction (XRD) and optical micrograph was used. It was observed that the N&T heat treatment provides the homogeneous microstructure compared to PWHT. The superior mechanical properties was also measured in N&T condition compared to PWHT. Study of fracture surface morphology of tensile tested specimen in different heat treatment condition is also presented.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  7. [해외논문]   Effect of the thermomechanical coupling on fatigue crack propagation in NiTi shape memory alloys   SCI SCIE

    You, Yajun (Engineering Simulation and Aerospace Computing(ESAC),Northwestern Polytechnical University,127,Youyi West Rd, Xi'an, Shaanxi 710072, China ) , Zhang, Yahui (IMSIA, UMR 8193 CNRS-EDF-CEA-ENSTA, Université) , Moumni, Ziad (Paris Saclay, 828 Boulevard des Maréchaux, 91762 Palaiseau Cedex, France ) , Anlas, Gunay (Engineering Simulation and Aerospace Computing(ESAC),Northwestern Polytechnical University,127,Youyi West Rd, Xi'an, Shaanxi 710072, China ) , Zhang, Weihong (Department of Mechanical Engineering, Bogaziçi University, Bebek, Istanbul 34342, Turkey )
    Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685 ,pp. 50 - 56 , 2017 , 0921-5093 ,

    초록

    Abstract In this paper, the effect of thermo-mechanical coupling on fatigue crack propagation in a NiTi pseudo-elastic shape memory alloy (SMA) is investigated. Single Edge Crack (SEC) specimens are loaded at different frequencies to see the effect of frequency on mechanical response of the edge cracked NiTi plate. The crack length and the temperature at the crack tip are measured using an Infrared Thermography (IR) camera. In particular, the evolutions of the maximum temperature at the crack tip and the crack length with respect to number of loading cycles at different loading frequencies are plotted. The results show that the crack growth rate is significantly frequency-dependent, and the growth rate decreases with increasing frequency.

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  8. [해외논문]   An examination of adiabatic shearing behavior in ZK60 alloy with different states of heat treatment   SCI SCIE

    Yang, Yang (School of Material Science and Engineering, Central South University, Changsha 410083, China ) , Jiang, Lihong (School of Material Science and Engineering, Central South University, Changsha 410083, China ) , Xu, Zhen (Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada ) , Wang, Zhen (School of Material Science and Engineering, Central South University, Changsha 410083, China)
    Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685 ,pp. 57 - 64 , 2017 , 0921-5093 ,

    초록

    Abstract Adiabatic shearing behavior and fracture were investigated in ZK60 magnesium alloy by means of radial collapse of a thick-walled cylinder. The alloy was tested in the solid solution (T4), as-extruded (T5) and solid solution plus aged (T6) conditions to examine adiabatic shearing behavior. Results showed that the alloy was less susceptible to the formation of Adiabatic Shear Bands (ASBs) under the T4 condition due to the number of observed adiabatic shear bands and their corresponding average lengths. On the other hand, the alloy under the T5 condition was more susceptible to the formation of adiabatic shear bands with 39 and 41 shear bands observed under effective strains of 0.72 and 0.95 respectively. Nevertheless, the shear bands observed in the T6 condition were longer compared to all the other heat treated conditions. The widths of the ASBs are 3.8μm, 8.56μm and 8.62μm at the T4, T5 and T6 states respectively. It was shown that the alloy under the different conditions provide a wide range of microstructural parameters and mechanical properties. It was shown that the ZK60 magnesium alloy under the different conditions provide a wide range of microstructural parameters (grain size, precipitates) and mechanical properties that affect its adiabatic shearing behavior. It is concluded that ASB is one of the damage fracture models under this kind of high strain rate loading where cracks nucleated on the edge of the ASBs and propagated along the shear direction.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  9. [해외논문]   A reconsideration of the relationship between structural features and mechanical properties of carbon fibers   SCI SCIE

    Li, Denghua (National and Local Joint Engineering Laboratory of Advanced Road Materials, Shanxi Transportation Research Institute, Taiyuan 030006, China ) , Lu, Chunxiang (National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China ) , Wang, Lina (National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China ) , Du, Sujun (National and Local Joint Engineering Laboratory of Advanced Road Materials, Shanxi Transportation Research Institute, Taiyuan 030006, China ) , Yang, Yu (National Engineering Laboratory for Carbon Fiber Technology, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China)
    Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685 ,pp. 65 - 70 , 2017 , 0921-5093 ,

    초록

    Abstract The relationship between mechanical properties and micro-structures of carbon fibers was reconsidered based on the "elastic unwrinkling" model and Griffith microcracks theory. Experimental results showed, stress relaxation and elastic unwrinkling process could both be observed in non-graphitic fibers, the tensile deformation of which was suitable to be described by “elastic unwrinkling” model. However, elastic unwrinkling process was not so obvious in graphitic fibers since the recrystallization of the crystalline structure had changed the shear compliance of the carbon lattice. A correction towards the compliance was proposed in this case based on the surface fractal of the graphitic fibers. On the other hand, the relationship between tensile strength and the void's parameter of carbon fibers was found generally follow the Griffith equation. In addition, some factors besides of voids, e.g., the local density fluctuation etc., were also found indirectly related to the tensile fracture process of carbon fibers, while a complete exposition of the influencing mechanism remained to be further explored.

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  10. [해외논문]   Effect of heat treatments on the microstructure of an ultrafine-grained Al-Zn-Mg alloy produced by powder metallurgy   SCI SCIE

    Queudet, H. (French-German research Institute of Saint-Louis, France ) , Lemonnier, S. (French-German research Institute of Saint-Louis, France ) , Barraud, E. (French-German research Institute of Saint-Louis, France ) , Ghanbaja, J. (Institut Jean Lamour - UMR 7198 CNRS - Université) , Allain, N. (de Lorraine, Nancy, France ) , Gaffet, E. (Laboratory of Microstructure Studies and Mechanics of Materials - UMR CNRS 7239, Université)
    Materials science & engineering. properties, microstructure and processing. A, Structural materials v.685 ,pp. 71 - 78 , 2017 , 0921-5093 ,

    초록

    Abstract Previous study by Queudet et al. showed that powder metallurgy allows to produce high strength ultrafine-grained (UFG) Al-Zn-Mg alloys which contains both η ' and η phases. This present work investigates the effects of solid solution treatment followed by quenching (W temper) and subsequent ageing to obtain theoretical T6 tempered UFG material. TEM analyses revealed the presence of GP zones and metastable η ' phase in W tempered UFG material. Compared to as-fabricated material, quenching conferred to the alloy higher maximum stress of 785MPa and stabilized plastic flow. Further ageing resulted in over-aged alloy containing the η phase, inducing lower hardness and compressive stress. TEM observations showed that variant η 2 which grows from η ' is delimited by previous GP-II zones.

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