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  • 2005-2009  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Brazing of Ti Using a Zr-Based Amorphous Filler (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 135 (Feb. 2008), p. 131-134 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The microstructure and mechanical properties of Ti joints brazed with aZr41.2Ti13.8Ni10.0Cu12.5Be22.5 (at.%) amorphous filler were investigated. With a Zr-based amorphousfiller, in this study, Ti joints with a homogeneous composition could be obtained by heating to wellbelow the α-β transformation temperature for a short time, so that the undesirable effects of the hightemperature heating are considerably diminished. The joints brazed at 790 °C for 10 min consisted ofthe coarse acicular structure rather than the fine Widmanstätten structure which generally deterioratesthe ductility of the joints. The joints with the homogenous coarse acicular structure, i.e. without aresidual liquid region, show almost the same mechanical properties as those required for base metalswithout heating. Although the residual liquid region in the joints deteriorates the ductility of the joints,this region could be successfully removed by a diminution in the quantity of the filler
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.135.131.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Fabrication of Bulk Amorphous Alloy Sheets by Strip Casting (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 24-25 (Sept. 2005), p. 371-374 
    Details
    ISSN: 1422-6375
    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/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.24-25.371.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Solidification Behavior of Fe-Base Amorphous Alloys during Twin-Roll Strip Casting (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 433-438 
    Details
    ISSN: 1662-8985
    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: Solidification behavior of two Fe-base amorphous alloys during twin-roll strip casting hasbeen investigated in the present study. Continuous cooling transformation (CCT) diagrams of bothalloys were calculated using the heterogeneous nucleation theory coupled with thermal data obtainedduring cooling. Cooling sequence during twin-roll strip casting was also simulated. These were usedfor the determination of the optimum twin-roll strip casting conditions at which desirablesolidification behavior could be achieved. It shows that twin-roll strip casting can continuouslyfabricate sheet product of Fe-base bulk amorphous alloys, despite their higher liquidus temperaturesand larger differences between liquidus and glass transition temperatures (Tg) than those of othereasier glass-forming bulk amorphous alloys
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.433.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    The Effect of Ag Diffusion Barrier on the Microstructure of a Titanium Dissimilar Joining (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 135 (Feb. 2008), p. 135-138 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In this study, joining characteristics of dissimilar Ti and Cu metals have beeninvestigated, when using both an Ag-based eutectic alloy as a filler and an Ag layer present on Tibase metal as a diffusion barrier. The observed microstructures were classified into threecharacteristic types, depending on the presence of a Ag layer at the Ti interface, e.g. first, thesample retaining thick continuous intermetallic layers, e.g. Ti2Cu, TiCu, Ti3Cu4, Ti2Cu3, and TiCu4by a significant dissolution of the Ti atoms into the molten filler, in the absence of a Ag coatinglayer onto the Ti base metal, second, the sample with relatively thin Ti-Cu intermetallic layers bythe reduced reaction of Ti with Cu due to a prominent decrease in the Ti dissolution, owing to therole of the Ag coating layer as a diffusion barrier, and finally, the sample without any brittle Ti-Cuintermetallics in the joint by a complete suppression of both the dissolution of the Ti atoms and itsreaction with the Cu elements in the molten filler due to the presence of a Ag layer
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.135.135.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Advancement in Prediction and Control of Welding Residual Stress and Distortion (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 3943-3948 
    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: Weld modeling technology and control and mitigation techniques of residual stress anddistortion have made a significant progress in the past decade. Q-Weld as the latest development inweld modeling technique can provide a solution in an extremely short time compared to a traditionalthermo-elastic-plastic analysis. Three distortion control techniques, transient thermal tensioning, lowstress non-distortion and in-process rolling, are discussed in this paper
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.3943.pdf
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Microstructure and Mechanical Properties of Twin-Roll Strip Cast Mg Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 119-126 
    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: Development of wrought Mg alloys, particularly in sheet form, is essential to support thegrowing interest for lightweight components in the automotive industry. However, development ofMg alloy sheets has been quite slow due to the complexity of sheet production originated from limiteddeformability of Mg. In this respect, twin-roll strip casting, a one-step processing of flat rolledproducts, can be an alternative for the production of Mg alloy sheets. In this study, AZ31 andexperimental ZM series alloys are twin-roll strip cast into 2 mm thick sheets. The microstructure ofthe as-cast AZ31 alloy sheet consists of columnar zones near the roll side and equiaxed zones in themid-thickness region. On the other hand, as-cast ZM series alloy sheets show equiaxed dendriticstructure through the thickness of sheet. These alloys were subjected to various thermo-mechanicaltreatments and their tensile properties were evaluated. Twin-roll strip cast AZ31 alloy in H24condition has equivalent yield and tensile strengths with similar ductility compared to commercialingot cast AZ31-H24 alloy, indicating that twin-roll strip casting is a viable process for the fabricationof Mg alloy sheets. The experimental ZM series alloys have a large volume fraction of fine dispersoidparticles in the microstructure, resulting from the beneficial effect of twin-roll strip casting onmicrostructural refinement. It has been shown that the experimental ZM series alloys have superiortensile properties compared to commercial ingot cast AZ31-H24 alloy, suggesting the possibility ofthe development of new wrought Mg alloy sheets by twin-roll strip casting
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.119.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Fabrication of High Density Y〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Ceramics by Magnetic Pulsed Compaction (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 119 (Jan. 2007), p. 175-178 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Highly dense Y2O3 ceramics have been fabricated by a magnetic pulsed compaction(MPC) which is capable of reaching a sufficiently high pressure (~1GPa) in a very short duration (afew microseconds), and a subsequent pressureless sintering at 1600℃. The Y2O3 green bodies witha relative density of about 68% were achieved by the application of the MPC process due to theeffect of an enhanced rearrangement and a high speed movement of the particles, without the helpof ceramic binder. Those compacts showed densities greater than 95%, which is very close to thetheoretical density, after the subsequent pressureless sintering process at 1600 oC. The shrinkagerates of the diameter for the samples compacted by the MPC process were markedly reduced, whencompared to those for the ones by the conventional compaction (CC) process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.119.175.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Microfracture Observation of Zr-Based Bulk Metallic Glasses (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 645-648 
    Details
    ISSN: 1013-9826
    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: Microfracture mechanisms of Zr-based bulk metallic glass (BMG) alloy containingductile crystalline particles were investigated by directly observing microfracture processes usingan in situ loading stage. Strength of the BMG alloy containing crystalline particles was lower thanthat of the monolithic BMG alloy, while ductility was higher. According to the direct microfractureobservation, crystalline particles initiated shear bands, acted as blocking sites of shear band or crackpropagation, and provided the stable crack growth which could be confirmed by the R-curveanalysis, although they negatively affected apparent fracture toughness. This increase in fractureresistance with increasing crack length improved overall fracture properties of the alloy containingcrystalline particles, and could be explained by mechanisms of blocking of crack or shear bandpropagation, formation of multiple shear bands, crack blunting, and shear band branching
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.645.pdf
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