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  • 1
    Online Resource
    Online Resource
    The Influence of Processing Parameters on Mechanical Properties and Microstructure of Welding Zone for Ti〈sub〉3〈/sub〉Al-TC4 Dual Alloy
    Trans Tech Publications, Ltd. ; 2005
    In:  Materials Science Forum Vol. 475-479 ( 2005-1), p. 445-448
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 475-479 ( 2005-1), p. 445-448
    Abstract: It has been investigated that the influence of processing parameters on mechanical properties of weld zone for Ti-24Al-15Nb-1.5Mo and TC4 dual alloy welded by electron beam in vacuum. The results shows the remarkable influence factors are heat treatment regime and deformation for yield strength of welded dual alloy samples at room temperature tensile test, and the remarkable influence factor is forging temperature for the elongation in tensile test at 500°C. From the combined analysis about other properties at room temperature and 500°C, the microstructure of the weld seam, it can been gotten the optimum parameters of processing dual alloy, i.e. forging at 1020°C, soaking for 12 hour at 700°C, air cooling, about 40% deformation and using billet of rolling state.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.475-479
    DOI: 10.4028/www.scientific.net/MSF.475-479.445
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2005
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  • 2
    Online Resource
    Online Resource
    Microstructural Evolutions of a High Temperature Titanium Alloy Processed by Thermal Mechanical Treatments
    Trans Tech Publications, Ltd. ; 2013
    In:  Materials Science Forum Vol. 747-748 ( 2013-2), p. 860-865
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 747-748 ( 2013-2), p. 860-865
    Abstract: TG6 alloy is a new titanium alloy which has been designed to reach the service temperature of 600°C. The microstructural evolutions of TG6 alloy under different thermal mechanical treatments were studied. It was found that lamellar microstructures with basketweave α lamella are obtained for TG6 alloy forged in β field. The evolution mechanism is transformed from dynamic recrystallization to dynamic recovery and the thickness of α lamella increases with increasing forging temperature. The aspect ratio of α lamella decreases firstly and then increases with increasing deformation degree. Grain boundary α lath appears when the deformation degree is less than 40%. The thermal mechanical treatments, including deformation in β field firstly and then deformation in α+β field result in the transformations of the microstructures drastically. The deformation degree in α+β field decides the final microstructure. The deformation degree of 20% in α+β field results in partial globular α phase.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.747-748
    DOI: 10.4028/www.scientific.net/MSF.747-748.860
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
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  • 3
    Online Resource
    Online Resource
    Linear Friction and Electron Beam Welded Joints of Ti〈sub〉2〈/sub〉AlNb/TC11
    Trans Tech Publications, Ltd. ; 2010
    In:  Advanced Materials Research Vol. 97-101 ( 2010-3), p. 3895-3898
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 97-101 ( 2010-3), p. 3895-3898
    Abstract: Dissimilar joining of Ti-22Al-25Nb alloy and an α+β titanium alloy TC11 were carried out using electron beam process and linear friction process, respectively. The microstructure and tensile properties of the joints were investigated. The results show that both EBW and LFW could be adopted to the dissimilar joining of Ti-22Al-25Nb/TC11. The EB welded joint exhibits higher strength than that of the LF welded joint, due to the precipitation of O phase in the fusion zone of the former one. These results can be expected to be of great technical interest as basic data for the use of EBW or LFW in aerospace industry.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.97-101
    DOI: 10.4028/www.scientific.net/AMR.97-101.3895
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2010
    detail.hit.zdb_id: 2265002-7
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  • 4
    Online Resource
    Online Resource
    Research of Superplasticity Deformation Behavior about Coarse-Grain Ti-22Al-25Nb Alloy
    Trans Tech Publications, Ltd. ; 2013
    In:  Advanced Materials Research Vol. 818 ( 2013-9), p. 9-13
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 818 ( 2013-9), p. 9-13
    Abstract: This study investigates the superplastic deformation mechanism of coarse-grain materials .Superplasticity deformation behavior of Ti-22Al-25Nb alloy with 200~410μm coarse grain has been investigated through tensile test at 940~990°C and 3.3× (10 -2 ~10 -4 ) s -1 strain rate. Results prove coarse-grain Ti-22Al-25Nb alloy primary depends on slipping of crystal planes between two phases to achieve superplasticity. Transformation from lath O phase to ring equiaxed O phase occurs as temperature rises and its volume percent falls, but percentage of recrystallized B 2 phase increases. Dislocation can move round ring equiaxed O phase. Good plasticity can be preserved because O phase can flow as solid particle in semisolid slurry in B2 grain.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.818
    DOI: 10.4028/www.scientific.net/AMR.818.9
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
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  • 5
    Online Resource
    Online Resource
    The Change of Processing Maps in Hot Compression Procession for Ti-6.0Al-7.0Nb Biomedical Titanium Alloy
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 906 ( 2014-4), p. 254-258
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 906 ( 2014-4), p. 254-258
    Abstract: Isothermal compression tests were carried out on Ti-6.0Al-7.0Nb biomedical titanium alloy at the temperatures of 750900°C (all below β phase transition temperature about 1010°C) and strain rates of 0.0011.0s -1 . The processing maps were constructed to evaluate the efficiency of power dissipation ( η ) and recognize the flow instability regimes. True strain takes great effect on the efficiency of power dissipation η under the different temperatures and strain rates. The value of power dissipation η increases from 0.1 to 0.7 in most areas. When the strain is 0.9, the value of power dissipation η in most regimes is from 30% to 40%. There are two instability regimes respectively located around 780°C/1.0s -1 and 860-900°C/0.001-0.01s -1 when the strains are below 0.5. One of the instability regimes disappears when the strains are 0.5-0.7. When the strain is 0.9, there are still two instability regimes. The safe regime located around 780-840°C/0.1-0.01s -1 , and hot deformation can be carried out in this area.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.906
    DOI: 10.4028/www.scientific.net/AMR.906.254
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
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  • 6
    Online Resource
    Online Resource
    Temperature Effects of ECAP and Annealing after ECAP on Microstructure of TA15 Alloy
    Trans Tech Publications, Ltd. ; 2010
    In:  Advanced Materials Research Vol. 97-101 ( 2010-3), p. 332-336
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 97-101 ( 2010-3), p. 332-336
    Abstract: A study was conducted by optical microscope (OM) and transmission electron microscope (TEM) on the microstructure evolution of TA15 alloy by severe plastic deformation (SPD) and annealing after SPD. In this study, equal channel angular pressing (ECAP) was taken as the method of SPD. The chief aim of the present work is to investigate the temperature effects of ECAP and annealing after ECAP on microstructure of TA15 alloy. The results indicate that equiaxed microstructure has been obtained by ECAP at the temperatures of α+β phase region, and that with the increase in pressing temperature, equiaxed grains have become coarser and the content of α phase has reduced. β grains have been coarsened severely since the pressing temperature was above the α-β transformation temperature (Tβ). Annealed at proper temperature after ECAP, the α phase of TA15 alloy has been more homogeneous, prior α phase has been well globularized, and grains have not grown obviously. According to the testing of TA15 alloy, the optimized temperature parameters of ECAP and annealing after ECAP are 900°C and 700°C. Observation and Analysis of the TEM morphological images illustrate that a quantity of twinning deformations have been produced by ECAP at the temperatures below Tβ, which leads to the continued plastic deformation through the restarting of many slip bands.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.97-101
    DOI: 10.4028/www.scientific.net/AMR.97-101.332
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2010
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  • 7
    Online Resource
    Online Resource
    Research on the Mechanism of Interface Strengthening for Ti〈sub〉3〈/sub〉Al/TC11 Dual Alloy
    Trans Tech Publications, Ltd. ; 2011
    In:  Advanced Materials Research Vol. 314-316 ( 2011-8), p. 709-712
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 314-316 ( 2011-8), p. 709-712
    Abstract: The Ti3Al/TC11 dual alloy bar joined by electron beam welding was deformed by near isothermal forging and then processed by gradient heat treatment. Afterwards, the mechanism of interface strengthening has been investigated according to the microstructure evolution and properties. The results show the brittle phases formed in the re-solidification can be broken by near isothermal forging; the lattice distortion energy is increased obviously due to deformation, so the nucleation ratio of recrystallization is improved, which method is fine-crystal strengthening. After the dual alloy deformed by near isothermal forging is further processed by gradient heat treatment, the room temperature tensile strength of the joint is higher than that of the Ti3Al alloy; the high temperature tensile strength of the joint is equal to or higher than that of the TC11 alloy. The reason is that the finer and phases are precipitated from the phase transus microstructure in the welding interface, which produces the effects of fine-crystal strengthening and dispersion strengthening.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.314-316
    DOI: 10.4028/www.scientific.net/AMR.314-316.709
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2011
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  • 8
    Online Resource
    Online Resource
    Effects of Annealing on Microstructure and Microhardness of TA15 Titanium Alloy Processed by Equal Channel Angular Pressing
    Trans Tech Publications, Ltd. ; 2011
    In:  Materials Science Forum Vol. 675-677 ( 2011-2), p. 735-738
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 675-677 ( 2011-2), p. 735-738
    Abstract: The primary purpose of the present work is to investigate the effects of annealing after equal channel angular pressing (ECAP) on microstructure and microhardness of TA15 titanium alloy. A study was performed by annealing treatment on the microstructure evolution and microhardness variation of ECAPed TA15 alloy. The results state that, static recrystallization occurred distinctly during annealing after ECAP. Since a sample was annealed at a proper temperature and for proper time after ECAP, a larger amount of well globularized and more homogeneous equiaxed α phase has been attained, grains have not grown observably, and the relief of residual stress and work hardening for subsequent processing and using has also been achieved. Accordingly, the optimum annealing parameters of ECAPed TA15 alloy were optimized to be 973 K and 1 hour. The microhardness level of the sample annealed after ECAP was lower than that unannealed, and the microhardness level decreased with the increasing annealing temperature and time.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.675-677
    DOI: 10.4028/www.scientific.net/MSF.675-677.735
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2011
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  • 9
    Online Resource
    Online Resource
    Effect of ECAP Hot Processing on Grain Refinement and Superplasticity of 1933 Aluminium Alloy
    Trans Tech Publications, Ltd. ; 2007
    In:  Materials Science Forum Vol. 551-552 ( 2007-7), p. 193-198
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 551-552 ( 2007-7), p. 193-198
    Abstract: Cold and hot Equal-Channel Angular Pressing (ECAP) is an effective method to refine metallic grains. In this paper, superplastic properties of 1933 aluminium alloy were evaluated and the effect of hot ECAP on grain refinement and superplasticity was investigated. The testing results show that the refinement of grains can not be infinitely increased with the increasing of ECAP passes (or total strain). Under the isothermal ECAP conditions of the present study, optimum ECAP passes for 1933 alloy are 4 passes. The grain size of 1933 alloy was refined from 20~50μm to 7~12μm by means of ECAP for 4 passes at 300°C (route Bc), so its superplasticity was improved. Compared with original samples annealed at 400°C, the superplastic elongation of samples processed by ECAP for 4 passes increases by a factor of 130% about, and the range of superplastic temperature varies from 140°C to 210°C. The optimal superplastic temperature and initial strain rate is 510°C and 3.3×10-4s-1 individually, at which the elongation reaches 262% and the flow stress is 7.8MPa only. In a word, 1933 aluminium alloy can present more excellent superplasticity in wide range of superplastic temperature and strain rate.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.551-552
    DOI: 10.4028/www.scientific.net/MSF.551-552.193
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2007
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  • 10
    Online Resource
    Online Resource
    Influence of Isothermal Forging Temperature on Microstructure and Tensile Properties of Ti-5.8Al-4.0Sn-4.0Zr-0.7Nb-0.4Si-1.5Ta Near-α Titanium Alloy
    Trans Tech Publications, Ltd. ; 2010
    In:  Advanced Materials Research Vol. 97-101 ( 2010-3), p. 153-157
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 97-101 ( 2010-3), p. 153-157
    Abstract: The microstructures and room temperature and 600°C tensile properties of Ti-5.8Al-4.0Sn-4.0Zr-0.7Nb -0.4Si-1.5Ta alloy after isothermal forging have been studied. The forging temperature range was from 850°C to 1075°C, and the constant strain rate of 8×10-3/S-1 was adopted. With the increase of forging temperature, the volume fraction of primary α phase decreased and the lamellar α phase became thicker when the temperatures were in range of 850°C -1040°C; The grain size became uneven and the α phase had different forms when the forging temperature was 1040°C and 1075°C respectively; The tensile strength was not sensitive to the temperature and the most difference was within 20MPa. Tensile strength and yield strength attained to the maximum when temperature was 1020°C; the ductility decreased with the increase of forging temperature, and this trend became more obvious if forging temperature was above the β-transus temperature.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.97-101
    DOI: 10.4028/www.scientific.net/AMR.97-101.153
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2010
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