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  • 1
    Electronic Resource
    Electronic Resource
    Characterisation of Ti(Al,O)-Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Composite Powders and Thermally Sprayed Coatings (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 29-30 (Nov. 2007), p. 135-138 
    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: A feedstock of Ti(Al,O)-Al2O3 composite powders was produced by high energy millingof a mixture of Al and TiO2 powders followed by a thermal reaction process. The feedstock wasthen thermally sprayed using a high velocity oxygen-fuel (HVOF) technique on H13 steel substratesto produce Ti(Al,O)-Al2O3 composite coatings. The performance of the coatings was assessed interms of thermal fatigue behaviour and reaction with molten aluminium (soldering). The compositepowders and coatings were characterised using scanning electron microscopy (SEM) and X-raydiffractometry (XRD). This paper reports the experimental observations and discussescharacteristics and potential applications of the composite coatings
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.135.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrafine Grained Ti-47Al-2Cr (at%) Alloy Prepared by High Energy Mechanical Milling and Hot Isostatic Pressing (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 29-30 (Nov. 2007), p. 139-142 
    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: Gamma TiAl based alloys are important materials with potential applications in aerospaceand automotive applications due to their high specific strength and creep resistance. The major barrierfor their applications is their limited ductility at room temperature and limited hot workability. Oneway of overcoming this barrier is to reduce the grain sizes to ultrafine grained (〈500μm) ornanostructured (〈100nm) level. In our present study, we attempt to produce bulk ultrafine grained Ti-47Al-2Cr (at%) alloy using a combination of high energy mechanical milling of elemental powders toproduce a very fine structured Ti/Al/Cr composite powder and consolidation of the powder using hotisostatic pressing (HIPping). It was confirmed that high energy ball milling using a planetary ball millled to the formation of extremely fine Ti and Al layered composite structure. The thermal behaviour ofthe powder was studied using differential thermal analysis, and it was shown that the reactions betweenthe Ti and Al phases in the fine structured composite powder occur at fairly low temperatures, belowthe melting point of the Al phase (660oC). The macrostructure and phase structure of the HIPpedsamples were also examined using optical and scanning electron microscopy and X-ray diffractometry(XRD). This paper is to report and discuss the results of this investigation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.139.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Consolidation of TiAl Powder by Thermal Spray Processes (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 29-30 (Nov. 2007), p. 159-162 
    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: Thermal spray deposition has been widely used as a coating process for applying thinprotective layers to the need-to-protect materials, or substrates. Recent technological developmentsin thermal spray processing, particularly cold gas spraying (CGS) and supersonic plasma spraying(S-PS), have enabled some emerging applications for making structural components. This paperreports on the results of our recent attempts to obtain thick TiAl coatings using three coatingtechniques: atmospheric plasma spraying (APS), S-PS and CGS. We successfully achieved a 3 mmthick coating using both APS and S-PS techniques, but failed in cold spray. A significant phasechange was observed of the powder particles experienced during both APS and S-PS processes.Nevertheless, a considerable quantity of titanium oxides was observed in the APS coating
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.29-30.159.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    The Effect of Manganese on the Grain Size of Commercial AZ31 Alloy (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 488-489 (July 2005), p. 139-142 
    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 manganese on grain refinement of a commercial AZ31 alloy has beeninvestigated using an Al-60%Mn master alloy splatter as an alloying additive at 730 °C in aluminium titanite crucibles. It is shown that grain refinement by manganese is readily achievable in AZ31. Electron microprobe analyses reveal that prior to the addition of extra manganese the majority of the intermetallic particles found in AZ31 are of the Al8Mn5 type. However, after the addition of extra manganese in the range from 0.1% to 0.8%, the predominant group of intermetallic particles changes to the metastable AlMn type. This leads to a hypothesis that the metastable AlMn intermetallic particles are more effective than Al8Mn5 as nucleation sites for magnesium grains. The hypothesis is supported by the observation that a long period of holding at 730 °C leads to an increase in grain size, due probably to the transformation of the metastable AlMn to the stable Al8Mn5. The hypothesis hasalso been used to understand the mechanism of grain refinement by superheating
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.488-489.139.pdf
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Fabrication of TiAl Target by Mechanical Alloying and Applications in Physical Vapour Deposition Coating (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 805-808 
    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 research involves the development of a powder metallurgical route for producinggood quality TiAl targets for making physical vapour deposition (PVD) coatings. Mixtures ofelemental titanium and aluminium powders were mechanically milled using a novel discus millingtechnique under various conditions. Hot isostatic pressing (HIP) was then employed forconsolidation of the mechanically alloyed powders. A cathodic arc vapour deposition process wasapplied to produce a TiAlN coating. A microstructural examination was conducted on the targetmaterial and PVD coatings, using X-ray diffractometry (XRD), X-ray photoelectron spectrometry(XPS) and scanning electron microscopy (SEM). It has been found that combining mechanicalalloying and HIP enable us to produce a fairly good quality of TiAl based target. The PVD coatingsobtained from the TiAl target showed very high microhardness values
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.805.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Fabrication of Ti(Al,O)-Al〈sub〉2〈/sub〉O〈sub〉3〈/sub〉 Powder Feedstock for Thermal Spraying and Evaluation of Composite Coating (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 421-424 
    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: Ti(Al,O)-Al2O3 composite powders were produced by high energy mechanical milling ofa mixture of Al and TiO2 powders followed by combustion reaction. The powders were thenthermally sprayed on H13 steel substrates. Microstructural examination was conducted on thecomposite powders and thermally sprayed coatings using X-ray diffractometry (XRD) and scanningelectron microscopy (SEM). The performance of the coatings was evaluated in terms of microhardnessand thermal fatigue. The thermally sprayed coatings showed fairly good performance inthe preliminary thermal fatigue tests and did not display any wetting tendency to molten aluminum
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.421.pdf
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    Paper (German National Licenses)
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