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  • 1
    Electronic Resource
    Electronic Resource
    Theoretical Study of Twin Boundary Structure and Twin Boundary Energy of Mo-Re Alloy (1993)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 126-128 (Jan. 1993), p. 113-116 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.126-128.113.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Ausageing on the Precipitation Behavior of MX Carbonitride in Modified 9Cr-1Mo Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 2976-2981 
    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 precipitation behavior of MX carbonitride during a normalizing heat treatment with andwithout ausageing was investigated in a modified 9Cr-1Mo steel. The normalizing heat treatment wasperformed at 1150 oC for 1800 s. Ausageing was conducted at 765 and 500 oC for 1800 to 86400 s during thecooling from the heat treatment. The matrix of the steel was austenite single phase during normalizing andausageing, except for that ausaged at 765 oC for 86400 s. The initial austenite grain size and hardness werenot influenced by ausageing, except for the sample ausaged at 765 oC for 86400 s. Although Nb-rich MX(NbX) and cementite were observed, V-rich MX (VX) was not observed under any of the conditionsinvestigated. The amount of NbX in the steel ausaged at 500 oC was at least twice as large as that under theother conditions, and the amount in the steel ausaged at 760 oC was slightly larger than that in the steel thatdid not undergo ausageing. The precipitation of NbX took place during ausageing in the austenite matrix. Onthe other hand, it is well known that VX precipitates during tempering. An equilibrium mole fraction of VXin the austenite matrix calculated by Thermo-Calc. was larger than that of NbX at the ausageing temperatures.It is proposed that VX is an equilibrium phase at the ausageing temperature; however, VX nucleation takesmuch longer in the austenite matrix. It is postulated that the precipitation of VX is more strongly influencedby the interfacial energy rather than supersaturation. It is concluded that the precipitation of MX carbonitride,especially NbX, can be controlled by ausageing during cooling after a normalizing heat treatment
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2976.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Microstructural Control of Nb-Si Alloy with Invariant Reactions (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 1507-1512 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.1507.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Recovery in 15%Cr Ferritic Stainless Steel after Large Strain Deformation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 558-559 (Oct. 2007), p. 119-124 
    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: 15%Cr ferritic stainless steel was machined in rectangular samples and then processed bymultiple forging to a total cumulative strain of 7.2 at an ambient temperature. The large straindeformation resulted in almost equiaxed submicrocrystalline structure with a mean grain/subgrainsize of 230 nm and about 2.2×1014 m-2 dislocation density in grain/subgrain interiors. The annealingat a relatively low temperature of 500oC did not lead to any discontinuous recrystallizations. Thegrain/subgrain size and the interior dislocation density slightly changed to 240 nm and 2.1×1014 m-2,respectively, after annealing for 30 min, while the Vickers hardness decreased from 3140 MPa inthe as-processed state to 2900 MPa. This annealing softening was attributed to remarkable release(by 50%) of internal stresses, which are associated with a non-equilibrium character ofstrain-induced grain/subgrain boundaries
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.558-559.119.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Phase Equilibria and Atomic Diffusion in the Ir/CoAl System (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 477-480 
    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: Aiming for the design of simple thermal coatings including Ir as a diffusion barrier layerwith B2 aluminides bond coat such as CoAl, diffusion behavior and phase equilibria at the Ir/CoAlinterface have been investigated to understand thermal and chemical stability of the interface.Diffusion couples were prepared with various conditions of Ir, plate, powder and film deposited toexamine the effects on diffusion behavior. Moreover, the interdiffusion coefficient of binary Ir-M inthe Ir solid solution, DIr-M was determined using Boltzmann-Matano method, where M is selectedform elements used in heat resistant alloys. The potential of Ir as a diffusion barrier has beenevaluated particularly against diffusion of Al
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.477.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Compatibility between carbon fibre and binary aluminium alloys (1984)
    Springer
    Journal of materials science 19 (1984), S. 3107-3114 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Compatibility between carbon fibre and various binary aluminium alloys is investigated. Series of aluminium alloys are coated onto the fibre surface and the wetting behaviour of these alloys are observed by scanning electron microscopy after heating the coated fibres at 1073 K, well above the melting point of the alloys. It is found that the aluminium alloys containing such elements as indium, lead and thallium showed excellent wetting behaviour. These alloying elements have significantly smaller surface energies as compared to aluminium and they are practically insoluble with aluminium, even in the liquid states. Tensile test shows that the strength of carbon fibres is not degraded after heating at 1073 K when fibres are coated with an Al-1 at % Tl alloy. The reasons for these elements in aluminium to substantially improve the compatibility against carbon fibres are discussed from the thermodynamical point of view.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01026990
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  • 7
    Electronic Resource
    Electronic Resource
    Microstructure Control of Co〈sub〉3〈/sub〉AlC-Base Heat Resistant Alloys Using Optical Floating Zone Melting (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 833-836 
    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: Aiming for further improvement of mechanical properties of Co3AlC-based heat resistant alloys, microstructure control was conducted using optical floating zone (OFZ) melting. Unidirectional solidification was performed to align Co3AlC/a(Co) two-phase eutectic microstructure. Co3AlC single phase poly-crystal alloys were successfully fabricated for the first time by taking advantage of OFZ. Mechanical properties were evaluated for selected alloys by compression tests at ambient temperature, 1073 K and 1273 K. Excellent elevated temperature strength is achieved in Co3AlC single phase alloys and ductility is sufficiently improved in Co3AlC/a(Co) two-phase 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.475-479.833.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Precipitation Behavior and Phase Stability of Intermetallic Phases in Fe-Cr-W-Co Ferritic Alloys (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 845-848 
    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: Precipitation behavior of intermetallic phases in ferrite matrix is investigated bytransmission electron microscopy (TEM) in Fe-10Cr-1.4W-4.5Co (at%) alloys with and without 0.3at%Si. It is intended to provide basic information for the alloy design of ferritic heat resistant alloys strengthened by intermetallic compounds. In the alloy containing Si, icosahedral quasicrytalline phase (I-phase) is found to precipitate during aging at 873K. It is confirmed that selected area diffraction (SAD) patterns of the precipitates exhibit two-, three- and five-fold symmetry and have diffraction spots in the positions related to the golden section. In the Si-freealloy, the R-phase precipitates instead of I-phase at 873K, and the Laves phase precipitates in both alloys during aging at higher temperature, 973K. The Laves phase formed at 973K transforms to the I-phase in the Si-added alloy but to the R-phase in the Si-free alloy during subsequent aging at 873K. The factors in controlling the phase stability of I-phase, R-phase and Laves phase precipitatesin Fe-based alloys are discussed by the atomic size ratio and electron concentration factor (e/a)
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.845.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Fabrication of a carbon fibre/aluminium alloy composite under microgravity (1986)
    Springer
    Journal of materials science 21 (1986), S. 2763-2766 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Fabrication of a composite material with ultra low density and high stiffness under microgravity is the objective of the present investigation. The composite structure to be obtained is a random three-dimensional array of high modulus, short carbon fibres bounded at contact points by an aluminium alloy coated on the fibres. The material is highly porous and thus has a very low density. The motivation toward the investigation, simulation experiments, choice of the component materials and in-flight experiment during ballistic trajectory of a National Space Development Agency rocket are described herein. Supporting experimental evidence shows that the cohesion between the carbon fibre and the aluminium alloy is excellent, by which the achievement of desired properties of such composites seems probable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00551485
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature dependence of strength in a Cu3Au-5% Ni alloy and its relevance to the APB morphology (1983)
    Springer
    Journal of materials science 18 (1983), S. 1881-1886 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Temperature dependence of yield strength in a Cu3Au-5%Ni alloy is investigated by compression tests over a temperature range between 77 and 700 K. The ordered alloy having L12 crystal structure exhibits swirl-like antiphase boundary morphology and was found not to possess the anomalous positive temperature dependence of strength. Nickel free Cu3Au alloy has been reported to have the mechanical anomaly like Ni3Al and to exhibit maze-like APB morphology. Such relevance between APB morphology and the temperature dependence of strength in L12 ordered alloys is discussed in terms of the relative phase stability between L12 and long period superlattice structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00542085
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