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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Y Ion Implantation on Oxidation Behavior of IC6 Alloy at 1100°C (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 767-770 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effect of ion implantation of yttrium on the oxidation behavior of Ni3Al base alloyIC6 at 1100℃ was investigated by SEM/EDS, TEM and XRD methods. The results indicated that after Y ion implantation, the surface of IC6 alloy changed from large column crystals to fine distributed nano-crystals, and the density of dislocations in distorted region increased with the implanted ions dose, which can act as high-diffusivity path and oxide core. Comparing to un-implanted IC6 alloy, Y-implantation increased the oxidation rate of IC6 alloy in initial 25 h at 1100℃, but decreased the maximum weight gain and the oxidation rate in final period. Moreover, the oxide scales of Y-implanted IC6 alloy were more continuous and compact due to the benefit effect of yttrium, and had better coherence to substrate through reduction of oxide grain size resulting in oxide scale plasticity improvement. Hence the proper amount of implanted Y could improve the oxidation resistance of IC6 alloy at 1100℃ in air slightly
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.767.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Finite Element Simulation of Canned Forging on TiAl Alloy Containing High Nb (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 813-816 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A rigid plastic finite element simulation method on canned forging was introduced to explain and optimize the large ingot deformation of TiAl alloy containing high content of Nb. By this method the process of deformation and the distribution of stress and strain especially on the interface can be obtained, thus the influence of capsule on the deformation and final shape of ingot can be easily explained and an appropriate processing of canned forging was ingot
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.813.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructures and Properties of Refractory Niobium-Silicide-Based Composites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 737-740 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The microstructures, mechanical properties and oxidation resistance of the refractory Nb-silicide-based composites have been investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), compression tests and high-temperature oxidation experiments. The results showed that 1773K/100h heat-treatment was an optimum processing for acquiring equilibrium Nb solid solution and silicides microstructure. In the binary Nb-Si system, the microstructure consisted ofcontinuous Nb5Si3 equilibrium matrix and dispersed Nb particles, while in the theNb-Ti-Cr-Al-Si-(Hf) multicomponent system, there are two typical microstructures, i.e., a two-phase structure of β (Nb solid solution)+D81 Nb5Si3-type silicide in the alloys with the Si+Al content (15at.% and 6at.%, respectively), and a three-phase structure of β+D81 Nb5Si3-type + D88 Ti5Si3-type silicides in the alloys with lower Si+Al content (10at.% and 8at.%, respectively). The results of compression tests showed that all alloys display high strength at both room and high temperatures, only a slight decrease in compression properties occured for Nb-Ti-Cr-Al-Si alloys, comparing to the binary Nb-Si in-situ composites. This type of alloys possesses good high temperature strengths up to at least 1473K. The results of high-temperature oxidation experiments showed that the oxidation rates of the alloys with Ti, Cr, Al and Hf addition were at least one order of magnitude lower than those of the Nb-Si binary alloys
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.737.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Ta on the Oxidation Resistance of a Cast Nickel-Base Die Material with Low Cr and High W Content (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 669-672 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A conventional cast nickel-base superalloy with the chemical composition of Ni-16W-2Mo-1.5Cr-6Al wt % has been recently developed as isothermal forging die material operating at temperatures above 1000℃. The oxidation test results showed that the oxide scale spalled heavily after exposure in air at 1050℃ for 100 h, which is unacceptable for the process of isothermal forging. To improve the high temperature oxidation resistance, 3 wt% Ta was added into the alloy. Specimens after oxidation test were analyzed by the scanning electron microscope (SEM) and the X-ray diffraction analysis (XRD). The results showed that the oxides were mainly NiO, NiWO4, and NiAl2O4 for all the samples. The oxidation resistance of the alloy with 3wt%Ta was fairly good at 1050℃ with the mass gain rate of around 0.016g/m2•h and spallation of oxides less than 2g/m2 within 100h.The SEM results showed that a continuous protective layer of Al2O3 has been formed under the layer of NiO for the alloy containing Ta
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.669.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Oxidation Resistant Silicide Coatings for Nb〈sub〉ss〈/sub〉/Nb〈sub〉5〈/sub〉Si〈sub〉3〈/sub〉 In-Situ Composites (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 741-744 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Oxidation protective silicide coatings for the new Nbss/Nb5Si3 in-situ composites were prepared by molten salt method at 900℃. The experiment results indicated that the majority phase in the coating was NbSi2. More Nb5Si3 was formed at the interface between the substrate and NbSi2 layer during the oxidation. The oxidation resistance of the composites was improved by the coating, significantly. The improvement in the oxidation resistance of the composites maybe mainly attributed to the formation of large amount of SiO2 and Al2O3 on surface of coating
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.741.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of B on the Microstructures and High Temperature Oxidation Resistance of a Nb-Si System In Situ Composite (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1489-1494 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Nb-16Si-24Ti-6Cr-6Al-2Hf-xB(x=0, 0.5, 1, 2, 4, 6) in situ composites were prepared byarc-melting. Microstructure and the effect of boron on 1250[removed info]C oxidation resistance of the compositeswere investigated by scanning electron microscopy(SEM) and X-ray energy disperse spectrum(EDS)as well as X-ray diffraction(XRD). The experimental results showed that the high temperatureoxidation resistance of the alloy was remarkably improved by adding proper amount of boron. Thismay be resulted from several beneficial roles of boron, i.e., boron improves the resistance of Nb5Si3by solid solution strengthening, inhibits the diffusion of oxygen in the matrix, improves the adherencebetween the oxide scale and the substrate and increases the cracking resistance of the oxide scale.[removed info]
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1489.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Study on Interface Reactions between Nb-Si System In Situ Composite and Ceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1495-1500 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A Nb-Si system in-situ composite Nb-16Si-24Ti-6Cr-6Al-2Hf(at%) was fabricated usingvacuum arc melting method, and then was metallurgically reacted with four kinds of ceramics ZrO2,Y2O3 stabilized ZrO2, Y2O3, SiC+Si3N4 at elevated temperature. The microstructures in the interfacereaction zones were investigated by SEM and EDS. The results showed that different extent chemicalreactions between the composite and these four kinds of ceramics took place. It has been found thatHfO2 riched layer formed near the interfaces between the Nb-Si in-situ composite and three ceramicsof ZrO2, Y2O3 stabilized ZrO2 and Y2O3, and thickness of the reaction zones were about 100μm,10μm, 1μm respectively. C and N elements in SiC+Si3N4 ceramic diffused to the composite atelevated temperature, and a new phase that rich of Ti, C and N elements appeared nearby the interfaceand accumulated inhomogenously. It may be concluded that the interface reactions of both ZrO2 andSiC+Si3N4 with Nb-Si composite were very violent, therefore they are not suitable as face-coatmaterials of shell molds for investment casting; the interface reaction of Y2O3 stabilized ZrO2 andNb-Si composite was slighter than ZrO2 and SiC+Si3N4, and it can be used as face-coat material ofshell molds, the interface reaction of Y2O3 and Nb-Si composite was very slight, and is recommendedas an ideal face-coat materials of shell molds
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1495.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of Heat Treatment on Microstructure and Mechanical Properties for a Ni〈sub〉3〈/sub〉Al Base Single Crystal Alloy DDIC6 (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1443-1446 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effect of heat treatment on microstructures and stress rupture property of a Ni3Al basesingle crystal alloy DDIC6 was studied in the present investigate. The single crystal specimens wereproduced by screw selection crystal method. The heat treatment for the alloy was1300°C/10h+1120°C/4h+870°C/32h and 1300°C/10h+870°C/32h.The microstructures wereexamined by SEM, TEM and X-ray EDS techniques. The stress rupture tests were carried out in air byconstant load creep machines under 1100°C/130MPa with the specimens size of φ5×25 mm. Theexperimental results showed that the as-cast large size γ′ phases entirely dissolved after 1300°C/10h,and secondary fine γ′ phases precipitated by following aging at 1120°C and 870°C for certain periodsof time. The stress rupture life under 1100°C/130MPa increased from 20~30hrs for as-cast conditionto 60~100hrs for heat treatment condition. The improvement of the creep resistance of the alloy mayattribute to the decrement of the elements segregation at dendrite and interdendritic areas, and theproper size and distribution of γ′ phases
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1443.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of Ru on Microstructure of a Single Crystal Nickel-Base Superalloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1195-1200 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The effect of Ru on the microstructure of a high content refractory elements nickel baseSuperalloy has been studied in the present investigation. The results showed that, the adding of 3%Rudid not prevent the precipitation of TCP phase during high temperature exposure, and evenaccelerated the formation of TCP phase,however the addition of Ru decreased the growth rate of μphase significantly. In addition, the adding of Ru decreased the solving temperature of γ/γ′ eutectic by5°C, and increased the tendency of γ′ rafting during high temperature exposure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1195.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of Ru Additions on the Microstructures and Stress Rupture Life of a Directionally Solidified Ni-Based Cast Superalloy (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1201-1206 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Two directionally solidified (DS) Ni-based cast superalloys without and with 3wt. % Ruwere prepared. The effects of Ru addition on the microstructures and stress rupture properties of theheat treated superalloys were investigated. It is shown that the amount of eutectic in 3wt. % Ru alloywas less than that in alloy without Ru. The incipient melting structure was found after quenchingfollowed by 1295°C and 1300°C solid solution treatments in 3wt. % Ru alloy and in the alloy withoutRu, respectively. The temperature at which the eutectic pools dissolved completely was higher thanthe temperature at which incipient melting appears. In order to obtain the better mechanicalproperties, double aging treatment was carried out for both alloys to optimize the sizes, morphologiesand distribution of the γ′ phase. The stress rupture lives of the alloys were 55h and 108h under thecondition of 1070°C and 137MPa the alloys without Ru and with 3wt. % Ru respectively. It issuggested that 3wt. % Ru addition can prolong the stress rupture life of the alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1201.pdf
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