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  • Trans Tech Publications, Ltd.  (39)
  • Nie, Zuo Ren  (39)
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  • Trans Tech Publications, Ltd.  (39)
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  • 11
    Online Resource
    Online Resource
    Effect of High Strain Rate on Adiabatic Shear Sensitivity and Microstructures in Pure Titanium
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 915-916 ( 2014-4), p. 567-571
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 915-916 ( 2014-4), p. 567-571
    Abstract: As a model material, commercial pure titanium was rolled to plates with different dislocation boundaries. The dynamic mechanical response of Ti specimen was analyzed during impacted with Split Hopkinson Pressure Bar (SHPB) at different strain rates, and microstructure evolution was investigated using optical microscopy and transmission electron microscopy. It was found that adiabatic shear sensitivity was decreased with increasing strain rates for all as-annealed, 25% and 50% cold rolled states. To the contrary, for 70% cold rolled state the adiabatic shear sensitivity was increased with increasing strain rates. The microstructure of adiabatic shear bands (ASBs) were developed from elongation morphology to fine equiaxed grains in the specimens of 25% cold rolled state, and ASBs became broader with increasing strain rate.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.915-916
    DOI: 10.4028/www.scientific.net/AMR.915-916.567
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2265002-7
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  • 12
    Online Resource
    Online Resource
    Study of Aging Precipitation of Al-Zn-Mg Alloys with Er Additions by Monte Carlo Simulation
    Trans Tech Publications, Ltd. ; 2014
    In:  Materials Science Forum Vol. 794-796 ( 2014-6), p. 704-709
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 794-796 ( 2014-6), p. 704-709
    Abstract: Our former experimental study showed that the addition of Er to Al-Zn-Mg alloys speeded up the aging precipitation, accelerated the precipitation of and enhanced the effect of aging strengthening distinctively. In this paper, the Monte Carlo method was applied to simulate the microstructural evolution of Al-2.6Zn-(2.3Mg)-(0.07Er), Al-2.6Zn-2.3Mg-(0.12Er), and Al-2.6Zn-2.3Mg-0.1(Er,Zr) alloys during aging. The effects of Er addition to Al-Zn-Mg alloys on the clustering of Zn and Mg atoms are studied through analysis of the simulation results and the effects on the subsequent aging process are discussed as well. The results show that the Zn/Mg/Er clusters appear beside the Zn clusters, Mg clusters and Zn/Mg clusters in the Er addition Al-Zn-Mg alloys. The Zn clusters and Zn/Mg clusters are finer in the Al-2.6Zn-2.3Mg-xEr alloys than that in the Al-2.6Zn-2.3Mg alloys without Er addition. The size of the Zn clusters and Zn/Mg clusters in the Al-2.6Zn-2.3Mg-0.07Er is eight percent and nineteen percent smaller than that in the Al-2.6Zn-2.3Mg alloys without Er addition respectively. This precipitation refinement effect of Er addition to the Al-2.6Zn-2.3Mg alloys is enhanced with the increment of Er content. These above results are consistent with the experimental results that the precipitation in the Al-Zn-Mg alloys with Er is finer and denser than that in the Al-Zn-Mg alloys without Er. The Er addition changes the clusters distribution in the Al-Zn-Mg alloys by its interaction with the main solute atoms and the vacancy, and thus influences the precipitations during subsequent aging processing.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.794-796
    DOI: 10.4028/www.scientific.net/MSF.794-796.704
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2047372-2
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  • 13
    Online Resource
    Online Resource
    Effects of Initial Micro-Structures on Deformation Behaviors of Commercial Pure Titanium
    Trans Tech Publications, Ltd. ; 2016
    In:  Materials Science Forum Vol. 879 ( 2016-11-15), p. 2050-2054
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 879 ( 2016-11-15), p. 2050-2054
    Abstract: In this paper, effects of initial micro-structures on deformation behaviors of commercial pure titanium were elaborated by investigating the evolution of dislocation boundary and its adiabatic shear sensitivity. At the low to medium stain rates, the main plastic deformation mechanism of as-annealed commercial pure titanium is dislocation slipping. Meanwhile, geometrically necessary boundaries (GNBs) with different directions are generated and crossed with each other. However, new dislocation boundaries are formed in as-cold rolled plates, which are parallel to the initial ones induced by cold rolling. When the strain rate is up to 1000 s -1 , the initial dislocation boundary playes an adverse role in the adiabatic shear sensitivity of commercial pure titanium. The adiabatic shear band is the high-speed deformation characteristic micro-structure in commercial pure titanium. In addition, dynamic recrystallized grains are generated in the center of an adiabatic shear band, which is consistent with the sub-grain rotation mechanism.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.879
    DOI: 10.4028/www.scientific.net/MSF.879.2050
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2016
    detail.hit.zdb_id: 2047372-2
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  • 14
    Online Resource
    Online Resource
    Mechanical Behavior and Microstructure of Hot Deformation of with Er 7N01 Aluminum Alloy
    Trans Tech Publications, Ltd. ; 2020
    In:  Materials Science Forum Vol. 993 ( 2020-5), p. 294-298
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 993 ( 2020-5), p. 294-298
    Abstract: In this paper, an Al-Zn-Mg-Cu alloy with a small amount of Er and Zr added was used as the research object. The homogenization annealing was carried out, and the 7N01 aluminum alloy was used at 300 °C, 350 °C, 400 °C, 450 °C and 0.1 s -1 , 1 s -1 , 10 s -1 deformation conditions by Gleeble-3500 thermal simulator. Optical Microscopy (OM), Scanning Electron Microscopy (SEM), Electron Backscatter Diffraction (EBSD) and Transmission Electron Microscopy (TEM) were used for microstructure analysis. The results show that the stress-strain curve of with Er 7N01 aluminum alloy can be divided into micro-strain stage, uniform deformation stage and steady-state flow stage during the thermal compression process. The flow stress of 7N01 aluminum alloy achieved peaks at the initial stage of strain, and then increased with the increase of strain rate and the decrease of deformation temperature. With the increase of deformation temperature and the decrease of deformation rate, the recrystallization process was significantly increased.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.993
    DOI: 10.4028/www.scientific.net/MSF.993.294
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2020
    detail.hit.zdb_id: 2047372-2
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  • 15
    Online Resource
    Online Resource
    A New Green Approach for Recovery of Metallic Tungsten through Electrolysis of Tungsten Carbide Scrap Anode in Molten Salts
    Trans Tech Publications, Ltd. ; 2017
    In:  Materials Science Forum Vol. 898 ( 2017-6), p. 1871-1879
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 898 ( 2017-6), p. 1871-1879
    Abstract: In this study, a new green approach has been developed for the recovery of tungsten by using tungsten carbide (WC) scrap material as consumable anode in LiCl-KCl molten salts at 773 K to produce metallic tungsten. The feasibility of the direct electrochemical dissolution of WC anode into metallic tungsten was evaluated based on the experimental verifications and electrochemical methods. The effects of the main technical parameters, including the cell voltage, electrolysis time and electrolysis temperature, on the dissolved condition of anode were studied and the optimal anode parameters were obtained. It was found that a large electrolytic voltage, high electrolytic temperature and long electrolysis time would be favorable for the dissolved state of the tungsten carbide anode under the same conditions. The cathode product was analyzed using scanning electron microscopy (SEM) and X-ray diffraction (XRD). It was found that the tungsten particles with a diameter of 100 nm could be prepared by this process in a molten salt bath. Linear sweep voltammetry was applied to investigate the dissolution of WC anode, and showed that the WC scrap material could be used as consumable anode to produce tungsten powder. Other electrochemical techniques including cyclic voltammetry , square-wave voltammetry and chronopotentiometry were employed to explore the electrochemical properties of tungsten ion derived from WC anode in LiCl-KCl melts. These results confirmed that electroreduction of tungsten ion in the melts proceeded in one step with four exchanged electrons.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.898
    DOI: 10.4028/www.scientific.net/MSF.898.1871
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2017
    detail.hit.zdb_id: 2047372-2
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  • 16
    Online Resource
    Online Resource
    Immobilization of Laccase in Glycidoxypropyl-Functionalized Magnetic Mesoporous SiO〈sub〉2〈/sub〉/Fe〈sub〉3〈/sub〉O〈sub〉4〈/sub〉 Hollow Microspheres
    Trans Tech Publications, Ltd. ; 2016
    In:  Key Engineering Materials Vol. 697 ( 2016-7), p. 749-755
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 697 ( 2016-7), p. 749-755
    Abstract: Glycidoxypropyl-functionalized magnetic mesoporous SiO 2 /Fe 3 O 4 hollow microspheres (FMMS) with various amounts of terminally bonded groups in the pore channels were synthesized by the co-condensation of tetraethoxysilane (TEOS) and 3-glycidoxypropyltrimethoxylsilane (GPTMS) in the presence of cetyltrimethylammonium bromide (CTAB) and 1,3,5-triisoporpylbenzene (TMB), and utilized as supports for laccase immobilization. It is revealed that glycidoxypropyl groups have been successfully covalently attached to the pore wall of magnetic mesoporous SiO 2 /Fe 3 O 4 hollow microspheres (MMS). The magnetic mesoporous SiO 2 /Fe 3 O 4 microspheres (sample10%FMMS) have a saturation magnetization of 13.6 emu·g -1 and a low coercivity (50 Oe). The functional materials preserve a mesoscopic ordering at a concentration of GPTMS as high as 15%. The BET surface area and pore volume of the functionalized materials decrease with increasing amount of GPTMS, but a desirable pore structure remains when the GPTMS amount increases to 10%. The 10%FMMS material exhibits higher laccase immobilization and stability than pure MMS because of the covalent interaction between the amino groups of laccase and the epoxy groups of the functional MMS.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.697
    DOI: 10.4028/www.scientific.net/KEM.697.749
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2016
    detail.hit.zdb_id: 2073306-9
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  • 17
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    Synthesis and Characterization of Nanostructured Co(OH)〈sub〉2〈/sub〉 and Co〈sub〉3〈/sub〉O〈sub〉4〈/sub〉 Thin Films by a Simple Solution Growth Process
    Trans Tech Publications, Ltd. ; 2013
    In:  Key Engineering Materials Vol. 537 ( 2013-1), p. 247-251
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 537 ( 2013-1), p. 247-251
    Abstract: Nanostructured Co(OH) 2 thin films were synthesized by a simple solution growth process. In experiment, F – and NH 3 were used as Co 2+ ordination agents, and hydroxyl ions were supplied by ammonia hydroxide solution for the hydrolysis reaction. The results showed that the solution pH and F/Co ratio had great influences on the morphologies of the thin films. The Co(OH) 2 thin films were constructed with lots of Co(OH) 2 nanoflakes. Nanostructured Co3O4 thin films were prepared by annealing the Co(OH) 2 thin films at 400°C for 2 h. The magnetic properties of Co 3 O 4 thin films were also investigated.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.537
    DOI: 10.4028/www.scientific.net/KEM.537.247
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2073306-9
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  • 18
    Online Resource
    Online Resource
    Effect of Rare Earth Er on the Microstructure and Mechanical Properties of High Temperature Titanium Alloys
    Trans Tech Publications, Ltd. ; 2017
    In:  Materials Science Forum Vol. 898 ( 2017-6), p. 586-591
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 898 ( 2017-6), p. 586-591
    Abstract: The microstructures and mechanical properties of the high temperature titanium alloys containing Er, i.e. Ti-6Al-2.5Sn-4Zr-0.3Mo-1Nb-0.35Si-xEr (x=0, 0.1, 0.3wt%), were investigated. Both the grain size and lamellar structure inside grains were significantly refined with the addition of Er in as-cast alloys. Lamellar and duplex microstructures were obtained after forging and heat treatment. Silicide precipitates were generated in the boundary of lamellar α phase after aging treatment. Meanwhile, a few α 2 phase were precipitated in the alloys after aging treatment. After 600°C /100h thermal exposure, the α 2 phases with a mean size of 7nm and spacing of 10 nm were precipitated homogeneously in α lamellar. The creep properties were significantly improved by the addition of rare earth Er due to the formation of the second phase containing Er, silicide and α 2 phase.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.898
    DOI: 10.4028/www.scientific.net/MSF.898.586
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2017
    detail.hit.zdb_id: 2047372-2
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  • 19
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    Online Resource
    Finite Element Analysis on the Effect of the Texture to the Crack Tip Plasticity in Aluminum Alloy
    Trans Tech Publications, Ltd. ; 2016
    In:  Materials Science Forum Vol. 850 ( 2016-3), p. 328-333
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 850 ( 2016-3), p. 328-333
    Abstract: Plasticity zone at crack tip of aluminum alloy with fcc structure is investigated in order to analyze the effect of crystal orientation to the plasticity distribution on crack tip, as well as the effect to CTOD and J -integral, which is implemented using finite element code in Abaqus with a rate dependent crystal plasticity theory. The results show that the crack tip plasticity, stresses and CTOD are significantly affected by grain orientations. When the grains have single textures, Cube and S orientations have a strong ability to against crack propagation. However, when the grains combine textures, the increasing of misorientation enhances the resistance for crack growth. And when the tilt angle is higher, the crack deflection is promoted to reduce the crack propagation rate.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.850
    DOI: 10.4028/www.scientific.net/MSF.850.328
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2016
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  • 20
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    Online Resource
    Thermal Decomposition Characteristics and Drying Process of Municipal Sludge
    Trans Tech Publications, Ltd. ; 2017
    In:  Materials Science Forum Vol. 898 ( 2017-6), p. 2464-2469
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 898 ( 2017-6), p. 2464-2469
    Abstract: Using cement kiln dispose sludge from sewage plants can achieve the sludge stabilization, harmless, reduction and resource comprehensive utilization purposes. This is Not only to solve the problem of sludge treatment which is difficult to solve by sewage treatment plant, but also to make full use of the sewage treatment plant sludge to replace part of cement clinker production materials. And it makes full use of sludge incineration emitted in the process of low calorific value. Municipal sludge contains more moisture. It is necessary to dry the sludge outside the kiln before entering kiln process. As cement kiln co-processing, it should be combined with the characteristics of NSP clinker production, it is necessary to not only consider the total energy consumption of the drying process, but also the re-use of dried sludge heat value, as well as consider the total of water into the kiln by drying sludge affecting the whole clinker production process. In this paper, with the initial solid content 20%, dry heating value 3400 cal/g sludge as a research object, the moisture morphology, thermal characteristics, drying technological parameters and composition of water after drying in sludge were analysed. This issue combines sludge drying with cement kiln disposal, which can not only solve the heat and odor problem during the individual sludge drying process, but also provide a theoretical basis for cement kilns co-disposal of municipal sewage sludge to achieve the purposes of sludge stabilization, harmless, minimization and resource utilization.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.898
    DOI: 10.4028/www.scientific.net/MSF.898.2464
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2017
    detail.hit.zdb_id: 2047372-2
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