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  • 2005-2009  (5)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Wear Loss and Elution of C.P.Ti and Titanium Alloys in Simulated Body Fluids (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 2333-2336 
    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: Wear behavior of titanium materials such as C.P.Ti, Ti-6Al-4V and Ti-6Al-7Nb, wasstudied in simulated body fluids by means of the pin-on-disk type wear testing. The mass loss in wear testing increased with increasing the sliding distance. The a+b type titanium alloys, Ti-6Al-4V and Ti-6Al-7Nb, exhibited higher wear resistance than the C.P.Ti. Average size of the wear debris was 4.5 µm and 3.7 µm for C.P.Ti and the a+b type titanium alloys, respectively. The elution of metallic constituents into 1 mass% lactic acid solution was detected after the wear test
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.2333.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Surface Hardening Treatment in Use of CO Gas and Post-Heat Treatment in C.P. Titanium and Titanium Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 109-114 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Surface hardening treatment of titanium materials in use of CO gas was studied includinginvestigation of post heat treatment under vacuum. C.P. titanium, α+β type SP-700 alloy withTi-4.5%Al-3%V-2%Mo-2%Fe and β type alloy with Ti-15%Mo-5%Zr-3%Al were used. Surface hardeningwas conducted by heating these materials at 1073K for 21.6ks in Ar-5%CO gas. Subsequently, specimenssubjected to surface hardening were heated at 1073k for various time periods under vacuum. While themaximum surface hardness value was the largest in C.P. titanium and the least in SP-700 alloy, hardeninglayer thickness was the thickest in β type alloy and the thinnest in C.P. titanium. Surface hardening in C.P.titanium was brought about by solid solution hardening due to oxygen and carbon. Enrichment of theseelements in the surface layer of both titanium alloys caused continuous variations of the microstructure suchas β to α+β, or their volume fractions in the surface hardening layer. Post heat treatment at 1073K increasedthe maximum surface hardness and hardening layer thickness with an extension of the heating time in C.P.titanium, but the surface maximum hardness decreased continuously in β type titanium alloy. Post heattreatment could remove the thin oxide layer formed by surface hardening treatment
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.109.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Calcium Phosphate Films Coated on Titanium by RF Magnetron Sputtering for Medical Applications (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 551-556 
    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: Calcium phosphate films were coated on commercially pure titanium substrates byradiofrequency magnetron sputtering using β-tricalcium phosphate targets. The films consisted ofamorphous calcium phosphate and oxyapatite phases. Immersion tests of the films were carried out inHanks’ solution and PBS(-), and apatite formation and calcium ion elution from the films wereinvestigated. The titanium cylinders coated with calcium phosphate films were implanted into themandibles of beagle dogs. These results suggest that coating with calcium phosphate improves thebiocompatibility of titanium implants with bone tissue
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.551.pdf
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The Effect of Small Amounts of Yttrium Addition on Static and under Superplastic Deformation Grain Growth in Newly Developed α+β Type, Ti-4.5Al-6Nb-2Mo-2Fe Alloy (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 970-975 
    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: New α+β type titanium alloy with Ti-4.5Al-6Nb-2Mo-2Fe was developedon the basis of using biocompatible elements and eliminating the cytotoxic ones suchas Vanadium, while achieving the desirable mechanical properties such as appropriatestrength, cold workability and low superplastic forming (SPF) temperature. Thepresent study was conducted to investigate the effect of yttrium addition of less than0.05% into this alloy on static and under superplastic deformation grain growthbehavior. The new alloy bar manufactured by α+β processing and annealed at 1073Kyielded extremely fine two-phase microstructure with α grain size around 2μm.Specimens were heated at temperatures of 1048, 1073 and 1098K and kept for timesbetween 3.6 to 172.8KS. Yttrium forms in-situ Y2O3 particles, and the presence ofthese particles yield finer two phase microstructure due to their retardation effect on βphase grain growth. Grain growth behavior during hot deformation was investigatedby hot compression test in use of a hot working simulator of THERMEC-Master Z.Strain rate was varied from 2×10-2 to 2×10-4S-1 and strain was 0.69. Grain size ofboth α and β phases increased with a reduction of strain rate, and Y2O3 particle wasalso effective to retard grain growth under hot deformation. It was confirmed fromcomparison of grain growth during isothermal heating with and without hotdeformation that grain growth was much accelerated by deformation. All of theseresults were discussed based on grain growth mechanism or model for two-phasemicrostructures as well as superplastic deformation mechanism
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.970.pdf
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of Cooling Rate and Direct Hot Deformation Conditions after Solidification on the Austenitic Microstructure Evolved by Simulated Strip Casting and Thin Slab Casting Processes in HSLA Steels (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 15-17 (Feb. 2006), p. 726-731 
    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: Currently new continuous casting processes such as thin slab caster or strip casting areindustrialized or under developing in the world steel makers. In these casting processes, cooling rateafter solidification becomes much faster compared with thick slab caster, and hot rolling millconnected directly with casting machine tends to be installed. The present study was conducted toinvestigate variations of austenitic grain size and micro segregation with cooling rate aftersolidification and also direct hot deformation conditions in austenite immediately after solidificationin HSLA steels. HSLA steels were 0.15%C-0.25%Si-1.50%Mn, 0.028%Nb and0.028%Nb-0.015%Ti with the same basic compositions. A hot working simulator ofTHERMECMASTER-Z was used, and the center part of tensile specimen set up in this machinewas partially or fully levitation-melted by induction heating under argon gas atmosphere. Aftermelting, specimens were cooled at cooling rate from 0.4K/s to 40K/s, and this range coveredcooling rates after solidification in heavy thick slab caster and strip casting. Direct hot tensilestraining in austenite after solidification was conducted at strain rates from 1.4×10-3s-1 to 2.6s-1,corresponding to an extracting speed in a respective caster. The increase of cooling rate refinedcontinuously as cast austenitic grain size, and it was enhanced in micro alloyed steels. Microsegregation such as Mn was improved by faster cooling. Direct straining after solidificationmarkedly refined austenitic grain size through dynamic or static recrystallization occurringdepending on strain rate
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.15-17.726.pdf
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    Paper (German National Licenses)
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