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  • Trans Tech Publications, Ltd.  (7)
  • Nie, Zuo Ren  (7)
  • 2020-2024  (7)
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  • Trans Tech Publications, Ltd.  (7)
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Language
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  • 2020-2024  (7)
Year
  • 1
    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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    Online Resource
  • 2
    Online Resource
    Online Resource
    Effect of Primary α Phase Content on Creep Property of High Temperature Titanium Alloy
    Trans Tech Publications, Ltd. ; 2020
    In:  Materials Science Forum Vol. 993 ( 2020-5), p. 217-222
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 993 ( 2020-5), p. 217-222
    Abstract: The effect of the primary α content and precipitate on the creep resistance of a high-temperature titanium alloy with a small amount of Hf addition were studied. The microstructures with different primary α contents were prepared by the heat treatment of 920~1010 °C /1 h+700 °C/5 h, and the creep test (600 °C/150 MPa/100 h) was carried out. The interaction between the precipitation phase and the dislocation configuration was analyzed. The results showed that with the increase of solution temperature, the volume fraction of primary α phase decreased from 44.9% at 920 °C to 0% at 1010 °C, and the steady state creep rate of the alloy decreased from 60.60×10 -4 %/h to 3.72×10 -4 %/h, indicating that the creep property was significantly improved with the decrease of solution temperature. The basket structure with optimal creep resistance was obtained under the heat treatment of 1010 °C/1 h+700 °C/5 h. It is believed that during the high temperature creep test, the precipitated α 2 phase and the hafnium-containing silicide hinder the dislocation motion in α crystal and the phase boundary, thereby improving the creep resistance of the alloy.
    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.993.217
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2020
    detail.hit.zdb_id: 2047372-2
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Investigations on the Hardness Distribution and Microstructure of Friction-Stir-Welded 6082 Aluminum Alloy
    Trans Tech Publications, Ltd. ; 2020
    In:  Materials Science Forum Vol. 993 ( 2020-5), p. 116-122
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 993 ( 2020-5), p. 116-122
    Abstract: The hardness and microstructure of friction stir welded (FSW) 6082 aluminum alloy joint were investigated by Vickers microhardness test, optical microscopy (OM), electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The hardness distribution is in a W shape, and from the base metal to the heat affected zone (HAZ) the hardness decreases from 103 HV to 72 HV, then gradually increases to 84 HV at the nugget zone (NZ). The grains of base metal (BM) are elongated and composed of a great quantity of low-angle grain boundaries. The nugget zon was of quite fine recrystallized grains. For the thermomechanical affected zone (TMAZ), the grain size is a little smaller than that of base metal and some low-angle grain boundaries remain. In the heat affected zone, the grain size was similar to that of the base metal. The β'' phase (Mg5Si6) and Al-Mn-Si particles are dispersed in the base metal. . In the heat affected zone, β'' phase transforms to β' phase (Mg9Si5). The hardness distribution in a W-shape was discussed on the basis of grain size, density of low-angle grain boundary and secondary phases.
    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.993.116
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2020
    detail.hit.zdb_id: 2047372-2
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Effect of Heat Treatment on Microstructure and Mechanical Properties of AlSi10Mg Alloy Fabricated by Selective Laser Melting
    Trans Tech Publications, Ltd. ; 2021
    In:  Materials Science Forum Vol. 1035 ( 2021-06-22), p. 312-317
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 1035 ( 2021-06-22), p. 312-317
    Abstract: The effects of the heat treatment process parameters on the microstructure and mechanical properties of a selective laser melted (SLMed) AlSi10Mg alloy were systematically investigated. The SLMed AlSi10Mg alloy was treated with T1 (180°C× 4h + air cooling) process, which had the microstructure of fine α-Al grains, fine Si phase, and nano-sized precipitations. The microhardness significantly increased to 150 HV, which is even higher than as-SLMed one (126 HV). The microhardness of SLMed AlSi10Mg alloy treated with T4 (540°C × 2h + water cooling) heat-treatment process significantly decreased to 62 HV due to the growth of α-Al grains, Si phase and the formation of β-AlFeSi phase. However, the microhardness and ultimate tensile strength of AlSi10Mg alloy treated with T6 (540°C × 2 h water cool + 180°C × 4 h air cool) process decreased to 91 HV, although the strengthening precipitation of Mg 2 Si phase formed. It indicates that the Mg 2 Si phase cannot compensate for the adverse effect of grain growth. It may provide the best potential heat treatment method for fabricating the high strength SLMed AlSi10Mg alloy.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.1035
    DOI: 10.4028/www.scientific.net/MSF.1035.312
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2021
    detail.hit.zdb_id: 2047372-2
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Microstructure Evolution of near α Titanium Alloy during Multi-Step Thermomechanical Deformation Process
    Trans Tech Publications, Ltd. ; 2021
    In:  Materials Science Forum Vol. 1035 ( 2021-06-22), p. 305-311
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 1035 ( 2021-06-22), p. 305-311
    Abstract: A new type of near α high temperature titanium alloy of Ti-Al-Sn-Zr-Mo-Si-Er was studied. The samples with different primary α phase content were prepared by solid solution at 950 °C/1 h—1010 °C/1 h. The multi-step hot compression experiments were carried out by Gleeble-3500 in a sequence of upper region of α + β phase, then followed by lower region of α + β phase. The effects of primary α phase content and deformation temperature on the microstructure of the alloy were studied by means of true stress-strain curve and optical microscope. The results show that the content of primary α phase gradually decreases from 45.4% at 950°C to 0% at 1010°C. As the deformation temperature decreases from 940°C to 900°C, the content of α phase increases gradually from 65% to 94%, which is changed from dynamic recrystallization to deformed structure elongated along RD direction. It is found that the arrangement of α phase along RD direction is the longest at 920°C. With the increase of the deformation temperature in the multi-step high temperature region from 970°C to 990°C, the width of deformed α phase decreases from 3.64 μm at 970°C to 2.71 μm at 990°C. The optimized microstructure is composed of 20% primary α phase arranged along RD direction. This process has a certain potential in the process of hot deformation of the alloy. Key words: high temperature titanium alloy, primary α phase, multi-step hot deformation
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.1035
    DOI: 10.4028/www.scientific.net/MSF.1035.305
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2021
    detail.hit.zdb_id: 2047372-2
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    Online Resource
  • 6
    Online Resource
    Online Resource
    Effect of Hydrothermal Conditions on Crystal Structure, Morphology and Visible-Light Driven Photocatalysis of WO〈sub〉3〈/sub〉 Nanostructures
    Trans Tech Publications, Ltd. ; 2020
    In:  Materials Science Forum Vol. 993 ( 2020-5), p. 893-898
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 993 ( 2020-5), p. 893-898
    Abstract: Tungsten trioxide (WO 3 ) nanostructures were synthesized by a hydrothermal method, and the influence of essential hydrothermal conditions, temperature and time, on their crystal structure, morphology and visible-light driven photocatalysis was studied. The hydrothermal temperature was varied from 120 °C to 200 °C, and the hydrothermal time changed from 12 h to 32 h. The crystal structure, morphology and photocatalytic performance of WO 3 nanostructures were characterized by XRD, SEM and UV-Vis. The crystal structure of WO 3 nanostructure was triclinic phase and their morphology was mainly one dimensional nanorods. Methylene blue was used as the target to evaluate their photocatalytic performance under visible light (λ 〉 420 nm). The photocatalytic results suggest the suitable hydrothermal conditions to synthesize WO 3 nanostructures for the wastewater treatment application.
    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.993.893
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2020
    detail.hit.zdb_id: 2047372-2
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  • 7
    Online Resource
    Online Resource
    Microstructure Evolution of Al-Zn-Mg-Cu Alloy with Erbium during Homogenization
    Trans Tech Publications, Ltd. ; 2021
    In:  Materials Science Forum Vol. 1035 ( 2021-06-22), p. 253-258
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 1035 ( 2021-06-22), p. 253-258
    Abstract: The microstructure evolution of Al-Zn-Mg-Cu alloy with erbium was studied by optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) during homogenization process. The results showed that there were serious component segregation in the as-cast structure of the alloy, mainly composed of T(AlZnMgCu) , S(Al 2 CuMg) and a small amount of Al 8 Cu 4 Er and Al 7 Cu 2 Fe. The overheating temperature of the alloy was 482.5 °C. After homogenized at 470 °C for 24 h, the dissolution of T(AlZnMgCu) phase and S(Al 2 CuMg) phase reached to a balance, but the residual Al 8 Cu 4 Er phase could not be dissolved completely. Compared with single-stage homogenization, Al 3 (Er,Zr) dispersion phase with smaller grain size and more uniform distribution can be obtained after two stage homogenization process of 400 °C for 8 h followed by 470 °C for 24 h. By comparing the residue of non-equilibrium eutectic phase, two-stage homogenization is the best.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.1035
    DOI: 10.4028/www.scientific.net/MSF.1035.253
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2021
    detail.hit.zdb_id: 2047372-2
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