Composition optimization of low modulus and high-strength TiNb-based alloys for biomedical applications.
The effect of chemical composition on microstructure and tensile properties of a series of low modulus Ti-Nb-Cu-Ni-Al alloys was studied. These alloys consist of primary micrometer-sized β-Ti dendrites surrounded by intermetallic phases. The morphology of the intermetallic phases is strongly affected by composition. Due to the composite microstructure, the alloys exhibit a low Young's modulus (77-84GPa) together with a high yield strength of about 1000MPa as well as moderate tensile ductility. The results demonstrate that complete substitution of Al by Ti reduces the Young's modulus by 5%. Increasing Nb content at the expense of Ti causes a significant improvement of tensile ductility.
IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069 Dresden, Germany; TU Dresden, Institut für Werkstoffwissenschaft, D-01062 Dresden, Germany; Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany. Electronic address: okulovilya@yandex.ru.
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Okulov
IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069 Dresden, Germany; Institute of Natural Sciences, Ural Federal University, 620000 Ekaterinburg, Russia.
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Volegov
School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth, WA 6027, Australia.
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Attar
IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069 Dresden, Germany.
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Bönisch
School of Engineering, Edith Cowan University, 270 Joondalup Drive, Joondalup, Perth, WA 6027, Australia.
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Ehtemam-Haghighi
IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069 Dresden, Germany.
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Calin
Erich Schmid Institute of Materials Science, Austrian Academy of Sciences (ÖAW), Jahnstraße 12, A-8700 Leoben, Austria; Department Materials Physics, Montanuniversität Leoben, Jahnstraße 12, A-8700 Leoben, Austria.
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Eckert
D000497:Alloys; D055119:Elastic Modulus; D008422:Materials Testing; D009556:Niobium / Q000032:analysis*; D013718:Tensile Strength; D014025:Titanium / Q000032:analysis*
D000497:Alloys; D009556:Niobium; D014025:Titanium
Biomedical alloy; Deformation mechanism; Implant material; Low Young's modulus; Titanium alloy