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  • Trans Tech Publications, Ltd.  (195)
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  • Trans Tech Publications, Ltd.  (195)
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  • 1
    Online Resource
    Online Resource
    Dynamic Recrystallization of 7055 Aluminum Alloy during Hot Deformation
    Trans Tech Publications, Ltd. ; 2010
    In:  Materials Science Forum Vol. 650 ( 2010-5), p. 295-301
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 650 ( 2010-5), p. 295-301
    Abstract: Compression tests were performed at temperatures from 350 to 450 °C with different strain rates of 1.0×10−2 and 1.0×10−1 s−1. The microstructures of deformed samples were investigated by electron backscatter diffraction (EBSD). Microstructure observations indicated that under present deformation conditions, fraction of new grains increases with the Z value. It was found that different nucleation mechanisms for DRX were operated in hot deformed 7055 alloy, which was closely related to deformation condition. DRX nucleation and development were discussed in consideration of bulging of original grain boundaries and occasional subgrain rotation near the grain boundaries. Discontinuous dynamic recrystallization (DDRX) which occurred in a local area was also proved to be a nucleation mechanism at higher Z value for 7055 alloy.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.650
    DOI: 10.4028/www.scientific.net/MSF.650.295
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2010
    detail.hit.zdb_id: 2047372-2
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  • 2
    Online Resource
    Online Resource
    The DSC Investigation on Phase Transformations of Directionally Solidified (DS) and Powder Metallurgy (PM) Ni-Base Superalloys
    Trans Tech Publications, Ltd. ; 2018
    In:  Materials Science Forum Vol. 941 ( 2018-12), p. 1035-1040
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 941 ( 2018-12), p. 1035-1040
    Abstract: The phase transformations of the directionally solidified (DS) and powder metallurgy (PM) Ni-base superalloys were investigated by JMatPro, synchrotron XRD (SXRD) and differential scanning calorimetry (DSC). The minor phases, such as MC, eutectic γ′ and Ni 5 Hf, and γ matrix with secondary γ′ existed in as-cast microstructure of DS DZ22. However, only γ matrix was found in PM625 alloy powders. The phase change in both heating (melting) and cooling (solidification) process was investigated by DSC on DZ22 test bar and PM625 alloy powders respectively. The DSC experiment with different heating/cooling rates (5-40°C/min) was performed on DS superalloy DZ22. The results indicated that the heating/cooling rate had obvious effect on the DSC results of the phase transformation temperatures of liquidus, MC carbides, solidus, eutectic (γ+γ′) and secondary γ′. The heating and cooling DSC curves shifted to high and low temperature direction respectively, accompanied by the heating/cooling rate increased. However, the average values of specific peaks of heating and cooling curves are relatively consistent which is close to the equilibrium phase change temperatures of the alloy and makes the results comparable. Besides the average value method, the liquidus temperature of the alloy (0°C/min) can also be obtained by method of linear-fit/extrapolating from 5-40°C/min heating/cooling rates or inflection point deviate from the baseline of DSC cooling curves which could minimize the heating/cooling rate effects. The DSC experiment was carried out on PM625 superalloy powders with different particle size range (0-355μm), the results indicated that the particle size had minor effect on liquidus and solidus temperatures of DSC heating curves, the differences were less than 2°C. The change in phase transformation temperatures under different heating/cooling rate should be considered for selecting the process parameter (heat treatment, HIP or casting) for manufacturing Ni-base superalloy components.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.941
    DOI: 10.4028/www.scientific.net/MSF.941.1035
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2018
    detail.hit.zdb_id: 2047372-2
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  • 3
    Online Resource
    Online Resource
    How to Build Affordable but High Quality Houses for Villagers: Appropriate Design for Aini Vernacular Houses in Xishuangbanna
    Trans Tech Publications, Ltd. ; 2012
    In:  Key Engineering Materials Vol. 517 ( 2012-6), p. 290-302
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 517 ( 2012-6), p. 290-302
    Abstract: Yunnan is very rich in natural resources, and using natural materials for building is an ancient tradition in local minority. In the remote poverty national areas, we always concern about making use of appropriate technical means, following the tradition of local construction, and efficiently applying local natural building materials. In addition, we pay close attention to improving their living quality effectively by the techniques. In this article, from a specific practice casethe United Nations GEF small grants programme, we make multiple detailed comparative analysis with traditional houses at the first, next we discuss appropriate design in the new residential construction of Aini in Xishuangbanna. And then we focus on using the local natural building materials such as bamboo, wood, adobe and other materials, by which we can make the improved design on roof system, wall system and floor system, so as to reduce construction costs and technical complexity, as well as we can effectively improve the living quality of construction at the same time. A demo project was constructed to show how these natural materials were integrated into a system to form the whole building. Joint team consists of local craftsmen and engineers constructed the demo-project so that the technology can be localized.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.517
    DOI: 10.4028/www.scientific.net/KEM.517.290
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2073306-9
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  • 4
    Online Resource
    Online Resource
    Influence of Metal Cations on the Structure and Release Property of Layered Double Hydroxide-Ibuprofen Host-Guest Materials
    Trans Tech Publications, Ltd. ; 2010
    In:  Advanced Materials Research Vol. 152-153 ( 2010-10), p. 556-559
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 152-153 ( 2010-10), p. 556-559
    Abstract: Layered double hydroxide (LDH)-ibuprofen (IBU) host-guest materials were prepared by in situ coprecipitation method for the purpose of drug controlled release. Three hosts containing different metal cations, MgAl-, ZnAl-, and MgFe-LDH, were studied. The results showed that the types of the metal cations had great influence on the structures of the host-guest materials and thus led to different drug release properities.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.152-153
    DOI: 10.4028/www.scientific.net/AMR.152-153.556
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2010
    detail.hit.zdb_id: 2265002-7
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    Online Resource
  • 5
    Online Resource
    Online Resource
    A Project of Protection Digital Evidence
    Trans Tech Publications, Ltd. ; 2011
    In:  Advanced Materials Research Vol. 268-270 ( 2011-7), p. 1653-1656
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 268-270 ( 2011-7), p. 1653-1656
    Abstract: To protect digital evidence during Computer Forensics, the measure of protection digital evidence was analyzed, and a project of protection digital evidence (Digital Evidence Protection System, called DEPS) was designed. In this paper, the framework and element of DEPS was introduced, and the mechanism of multi-digital-signature and digital time-stamp of DEPS was described.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.268-270
    DOI: 10.4028/www.scientific.net/AMR.268-270.1653
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2011
    detail.hit.zdb_id: 2265002-7
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  • 6
    Online Resource
    Online Resource
    Stress and Fatigue Analysis of Pressurizer Surge Line under Thermal Stratification
    Trans Tech Publications, Ltd. ; 2019
    In:  Key Engineering Materials Vol. 795 ( 2019-3), p. 268-275
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 795 ( 2019-3), p. 268-275
    Abstract: Pressurizer surge line is one of the key equipments of nuclear power plants. The thermal stratification due to the intersection of hot and cold fluids inside the pressurizer surge line may affect the safe operation of nuclear power plant. In order to investigate the stress distribution and fatigue characteristics of surge line subjected to long-term thermal stratified loadings, a mechanical model of the surge line was established. And then, according to different temperature distribution assumptions, thermal stress analysis and fatigue assessment were conducted. The results show that the maximum stress appears under the load condition with maximum temperature difference, and finer temperature distribution can obtain more accurate stress and displacement results. The maximum value of fatigue cumulative coefficient appears at the junction of straight pipe and elbow with large temperature difference.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.795
    DOI: 10.4028/www.scientific.net/KEM.795.268
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2019
    detail.hit.zdb_id: 2073306-9
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  • 7
    Online Resource
    Online Resource
    Development of Soil Screening Levels for Contaminated Sites Assessment in Beijing
    Trans Tech Publications, Ltd. ; 2012
    In:  Applied Mechanics and Materials Vol. 209-211 ( 2012-10), p. 1100-1105
    Details
    In: Applied Mechanics and Materials, Trans Tech Publications, Ltd., Vol. 209-211 ( 2012-10), p. 1100-1105
    Abstract: The Risk Based Corrective Action (RBCA) Tool Kit for Chemical Releases was used to develop Soil Screening Levels (SSLs) for contaminated sites assessment in Beijing. A total 88 contaminants, including inorganic compounds, volatile organic compounds, semi-volatile organic compounds, pesticides, polybrominated biphenyls and others, were identified as the priority compounds of concern, and a range of exposure parameters, toxicological data and site factors based on the environmental monitoring data from several contaminated sites in Beijing, were used as model inputs to derive SSLs. The proposed SSLs were evaluated and validated by comparing with corresponding values in some other countries/regions. The present study has an important guiding significance for the development of risk-based SSLs in other provinces/cities of China.
    Type of Medium: Online Resource
    ISSN: 1662-7482
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMM.209-211
    DOI: 10.4028/www.scientific.net/AMM.209-211.1100
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2251882-4
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  • 8
    Online Resource
    Online Resource
    Preparation of High-Performance Continuous Boron Nitride Fibers from Boracic Acid
    Trans Tech Publications, Ltd. ; 2014
    In:  Key Engineering Materials Vol. 602-603 ( 2014-3), p. 151-154
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 602-603 ( 2014-3), p. 151-154
    Abstract: Continuous multi-filament boron nitride fibers have been prepared on a large scale using the melt drawn technique from a low-cost boracic acid. Boracic acid was heated to obtain the molten boric oxide in a melting tank. Molten boric oxide was melt spun in a conventional manner through an 200-tip bushing to produce a continuous multifilament yarn consisting of 200 filaments of boric oxide. Boric oxide fibers were nitrided in an ammonia and were annealed in an inert atmosphere while simultaneously subjecting the fibers to sufficient longitudinal tension as to at least prevent longitudinal shrinkage of the fibers. The resulting fibers, consisting essentially of boron nitride, were less than about 8 μm in diameter and greater than 500 m in length. It indicated that the boron nitride fibers has a sound mechanical function with tensile strength of 1.40 GPa. The continuous boron nitride fibers of high-performance were especially suitable for reinforcing plastic, ceramic or metal matrices in the preparation of fiber reinforced composites.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.602-603
    DOI: 10.4028/www.scientific.net/KEM.602-603.151
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2073306-9
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  • 9
    Online Resource
    Online Resource
    Microstructure and Chemical Composition of Boron Nitride Fibers
    Trans Tech Publications, Ltd. ; 2013
    In:  Key Engineering Materials Vol. 591 ( 2013-11), p. 16-19
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 591 ( 2013-11), p. 16-19
    Abstract: Boron nitride(BN) fibres were synthesized by modified technique of Economy’s method. The products were characterized by X-ray diffraction (XRD), fourier transform infrared (FT-IR) absorption spectroscopy, field-emission scanning electron microscopy (FE-SEM), X-ray energy dispersive spectrum (EDS) and X-ray photoelectron spectroscopy (XPS). The results showed that BN fibers were mainly hexagonal boron nitride ( h -BN) with diameters of 5-8 μm and the major compositions of BN fibers are B and N with a very small amount of O and C. At last, the chemical composition of samples were determined by the chemical analysis test method like GB/T 16555-2008 and GJB 507-1998.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.591
    DOI: 10.4028/www.scientific.net/KEM.591.16
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2073306-9
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  • 10
    Online Resource
    Online Resource
    Zirconia Fiber Separator for Nickel-Hydrogen Battery
    Trans Tech Publications, Ltd. ; 2014
    In:  Key Engineering Materials Vol. 602-603 ( 2014-3), p. 898-901
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 602-603 ( 2014-3), p. 898-901
    Abstract: Zirconia fiber separator is one of the important materials of nickel-hydrogen battery .In this paper,we studied the factors affecting the properties of zirconia fiber separator used as nickel-hydrogen battery separator, which prepared by precursor process, including the precursor fibers,fibrous cloths,concentration of the precursor solution and the heating rate before 500oC.The results show that, because the gully structure copied the precursor fibers, as well as smaller diameter of the fiber has larger specific surface area, so the zirconia cloth has the higher absorption capacity and retention ability of alkal. In the same way as woven, the low fabric areal density is beneficial to the absorption ability. When the concentration of the precursor solution is 1.36g/ml, the properties of the zirconia fiber separator is the best. If the heating rate is too fast, will cause a decrease in performance of zirconia fiber separator. The diameter of the fibers in the zirconia fiber sepatator is about 4-5μm, the main phase of the separator is tetragonal zirconia.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.602-603
    DOI: 10.4028/www.scientific.net/KEM.602-603.898
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2073306-9
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