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  • 1
    Electronic Resource
    Electronic Resource
    Friction Wear of Commercial Aluminum Alloys (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 331-337 (May 2000), p. 1519-1524 
    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/2011/0528/02/04/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.331-337.1519.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Microstructural Change of Beta Type Titanium Alloy by Intense Plastic Deformation (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 503-504 (Jan. 2006), p. 705-710 
    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: Usual static recrystallization treatment and a method to provide intense plastic deformation, ARB namely Accumulative Roll-Bonding, have been applied to two beta type titanium alloys, i.e. Ti-29Nb-13Ta-4.6Zr and Ti-15V-3Cr-3Sn-3Al. Microstructural change as well as work-hardening behavior was examined as a function of plastic strain. Both the work-hardening rate and the hardness at the initial as-hot-rolled state were smaller in the Ti-Nb-Ta-Zr alloy than in the Ti-V-Cr-Sn-Al alloy. Recrystallized grains of 14μm in size were obtained by the usual static recrystallization treatment, which was significantly smaller than that of the starting as-hot-rolled plate of 38μm. No significant change other than flattening and elongating of the original grains was found in the optical microscopic scale. It was revealed, however, from a TEM observation combined with selected area diffraction technique that geometric dynamic recrystallization occurred in the Ti-Nb-Ta-Zr alloy deformed at room temperature by a true strain of 5, resulting in an ultra-fine-grained microstructure where the grain size was roughly estimated to be about 100nm
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/11/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.503-504.705.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanical Behaviors of Ti-29Nb-13Ta-4.6Zr-XO for Biomedical Applications Subjected to Cold Working and Various Heat Treatments (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1471-1476 
    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 oxygen content on aging behavior and invar characteristics ofTi-29Nb-13Ta-4.6Zr (TNTZ) were investigated. The age hardening of TNTZ aged at 573 K and 723K is enhanced with the oxygen content. The ω phase precipitates and grows from early stage ofaging in TNTZ regardless of the oxygen content when aged at 573 K. The lath-like shape α phaseprecipitated in TNTZ aged at 723 K increases in size with the oxygen content. The elastic modulusincreases with the oxygen content and aging. The ω phase increase the elastic modulus to a greaterextent than the increase due to the α phase. The tensile strength increases with the oxygen contentand aging, while the elongation decreases. TNTZ with oxygen content of 0.1 mass% exhibitsinvar-like characteristics through severe cold working. A higher oxygen content suppresses theinvar-like characteristics of TNTZ
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1471.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Mechanical Properties and Microstructures of Beta-Type Titanium Alloy for Biomedical Applications (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 557-562 
    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: Plain and notch fatigue properties of a β-type titanium alloy, Ti-29Nb-13Ta-4.6Zr (TNTZ),which was subjected to various thermomechanical treatments, were investigated in order to judge itspotential for biomedical applications.Microstructures of TNTZ aged at 723 K for 259.2 ks after cold rolling and those aged at 723 K for259.2 ks after solution treatment are composed of a precipitated α phase in the β phase. However,microstructures of TNTZ aged at 598 and 673 K for 259.2 ks after cold rolling and aged at 598 K and673 K for 259.2 ks after solution treatment are composed of a precipitated ω phase, and precipitated αand ω phases in the β phase, respectively. Futher, plain fatigue strengths of TNTZ aged after solutiontreatment and those of TNTZ aged after cold rolling increase with the aging temperature. In particular,TNTZ aged at 723 K after cold rolling exhibits the highest fatigue strength in both the low- andhigh-cycle fatigue life regions. Futher, the run-out, which is about 770 MPa, is nearly equal to that ofhot-rolled Ti-6Al-4V ELI conducted with aging, which is one of the representative α+β-type titaniumalloys for biomedical applications. The notch fatigue strengths of TNTZ aged at stress concentrationfactors of 2 and 6 decrease by 30% – 40% and 50% – 60%, respectively, as compared with the plainfatigue strengths in the low-cycle fatigue life region. Futher, the notch run-out range from 450 to 490MPa and from 220 to 300 MPa, respecitvely; an exception to this is TNTZ aged at 598 K after coldrolling, which has a high volume fraction of the ω phase. Single- and multi- fatigue cracks initiate atthe bottom of the notch at stress concentration factors of 2 and 6, respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.557.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanical Properties and High Temperature Deformation of Beta Titanium Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1379-1382 
    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: Because of its excellent environmental resistance and cold-working capacity, beta titaniumalloy Ti-15-3 has attracted more and more attention in aerospace manufacture industry. Another betatitanium alloy, Ti-29-13, has been recently developed for biomedical implant materials. Themechanical properties of three alloys including two β and one α+β are presented, particularly thecharacteristic of β alloy differing from that of α+β alloy. The high temperature deformation behaviorsof two alloys are also presented. Excellent formability of Ti-15-3 highlights the metal sheetapplication in commercial and military airplane. Band structure in Ti-29-13 has been found.Thermalmechanical processing is carried out to reduce the band structure and improve the elongation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1379.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Hard-Ceramic Layer Formed on Ti-29Nb-13Ta-4.6Zr and Ti-6Al-4V ELI during Gas Nitriding (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1509-1512 
    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
    Notes: The surface of Ti-29Nb-13Ta-4.6Zr (TNTZ) subjected to gas nitriding at 1023–1223 Kwas investigated in comparison with the conventional biomedical titanium alloy, Ti-6Al-4V ELI(Ti64). After gas nitriding, the microstructures near the surface of these alloys were observed byoptical microscopy, X-ray diffraction, Auger electron spectroscopy, and X-ray photoelectronspectroscopy. In both alloys, two titanium nitrides (TiN and Ti2N) are formed and the α phaseprecipitated by gas nitriding. Furthermore, oxygen impurity in the gas nitriding atmosphere reactswith the titanium nitrides; thus, TiO2 is formed at the outermost titanium nitride layer. The surfacehardening was also evaluated by Vickers hardness measurement. The Vickers hardness near thesurface of TNTZ and Ti64 increases significantly by gas nitriding
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1509.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Change in Tensile and Fatigue Properties of Biomedical Ti-29Nb-13Ta-4.6Zr Alloy Fabricated by Various Processings (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 561-565 (Oct. 2007), p. 1505-1508 
    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 tensile and plain fatigue properties of the β-type titanium alloy, Ti-29Nb-13Ta-4.6Zralloy (TNTZ), which was subjected to various thermomechanical treatments, and cast TNTZ wereinvestigated in order to judge its potential for biomedical and dental applications.The tensile strengths of TNTZ aged after solution treatment and that aged after cold rolling decreasewith an increase in the aging temperature; however, their elongation exhibits an opposite trend.TNTZ composed of the ω phase or the ω and α phases in the β phase exhibits a tensile strength ofabout 1000 MPa or more. The tensile properties of the cast TNTZ with and without a surfacereaction layer is are not significantly different, and are almost identcal to those of as-solutionizedTNTZ. The plain fatigue strengths of TNTZ aged after solution treatment and those of TNTZ agedafter cold rolling increase with the aging temperature. In particular, TNTZ aged at 723 K after coldrolling exhibits the highest fatigue strength in both the low- and high-cycle fatigue life regions.Further, the plain fatigue limit, which is about 770 MPa, is nearly equal to that of hot-rolledTi-6Al-4V ELI alloy subjected to aging after solution treatment; Ti-6Al-4V ELI alloy is arepresentative α+β-type titanium alloy for biomedical applications. The plain fatigue strength ofcast TNTZ with a surface reaction layer is considerably less than that of the as-cold-rolled andas-solutionized TNTZ. Consequently, in the low-fatigue life region, the fatigue crack easily occursat the surface reaction layer, which is brittle, and in the high-fatigue life region, the fatigue crackoccurs at the sites of casting defects (shrinkage). The fatigue limits range from 180 MPa to 200MPa
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1505.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Recent Research and Development in Metallic Materials for Biomedical, Dental and Healthcare Products Applications (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 193-200 
    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: Non-toxic allergy free alloying elements are mostly selected for preparing metallicbiomaterials. Currently, functionalities such as low modulus, shape memory, super elasticity, etc. arerequired for the metallic biomaterials, especially for β type titanium alloys. The harmonization ofmetallic, ceramic, and polymer biomaterials is needed for advanced biomaterials in the future.Titanium and its alloys are attracting considerable attention with regard to applications not only in thebiomedical field, but also for dental and healthcare products. In dentistry, titanium and its alloys areapplied to dental products such as crowns, inlays, bridges, etc., as well as dental implants. Forfabricating dental products, the dental precision casting process is important. A new dental precisioncasting process using calcia is currently being developed. Noble alloys such as gold base or silverbase alloys are widely applied for the precision casting of dental products. Allergy-free elements,particularly Pd-free low- noble dental alloys are required
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.193.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of Stress Triaxiality on Fracture Behaviour of Al-Li System Alloy (1996)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 217-222 (May 1996), p. 1499-1504 
    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/2011/0528/02/02/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.217-222.1499.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Fabrication of Ti-6Al-7Nb Alloys by Metal Injection Molding (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 357-360 
    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 metal injection molding process was applied to produce Ti-6Al-7Nb alloys using 3types of mixed powders. The first is a mixture of Ti and Al-Nb pre-alloyed powders, the second is amixture of Ti, Ti-Al alloy and Nb powders, and the third is a mixture of elemental powders of Ti,Al and Nb. The sintered compacts using the first and second powders showed higher density andmechanical properties than the compacts using the third powder which showed many large poresformed due to the dissolution of Al particles during the sintering steps. Eventually, the compactsusing a mixture of Ti+Al-Nb or Ti+Ti-Al+Nb powders showed tensile strength of above 800MPaand elongation of above 10%, which are similar to the properties of wrought materials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.357.pdf
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