Effects of Sn and Zr on the Microstructure and Mechanical Properties of Ti-Ta-Based Shape Memory Alloys

Tong, Y.X.; Guo, Bo; Zheng, Yufeng; Chung, C.Y.; Wang, Lok

doi:10.1007/s11665-010-9817-8

Cited by 34 publications

(16 citation statements)

References 19 publications

(12 reference statements)

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“…The well-known embrittling effects of the w phase and the probable difficulty of dislocation motion through the w phase may qualitatively account for the macroscopic brittle characteristics of the 1Mo alloy. A comparison of mechanical properties between the 5Mo alloy in present work and other recently reported b-titanium alloys [18,[44][45][46][47] has been displayed, Figure 7. The ascast 5Mo alloy shows superior tensile strength and comparable elongation.…”

Section: Resultsmentioning

confidence: 77%

Microstructures and mechanical properties of as‐cast titanium–zirconium–molybdenum ternary alloys

Yang

Wang

Shi

et al. 2018

Materialwissenschaft Werkst

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In this study titanium-zirconium-molybdenum alloys (Ti 50 Zr 50 ) 100-x Mo x (xMo; x = 0 at.%, 1 at.%, 3 at.%, 5 at.% or 7 at.%) were investigated, focusing on the effect of molybdenum addition on their microstructures and mechanical properties. Transmission electron microscopy observations revealed that the binary Ti 50 Zr 50 alloy was composed entirely of an acicular hexagonal structure of the a' phase. When the molybdenum content was 1 at.%, the alloy was composed of b and w phases. However, when 3 at.% or more molybdenum was added, only the equiaxed, retained b phase was observed. Tensile tests at room temperature indicated that the mechanical properties of the 1Mo alloy were inferior owing to the embrittlement effects of the w phase and the difficulty of dislocation motion through the w phase. Our research suggested that the 5Mo alloy had excellent ductility (16.5 %) as well as adequate strength (780 MPa). The improved mechanical properties were attributed to the enhanced stability of the b phase and the disappearance of the w phase.

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Section: Resultsmentioning

confidence: 77%

Microstructures and mechanical properties of as‐cast titanium–zirconium–molybdenum ternary alloys

Yang

Wang

Shi

et al. 2018

Materialwissenschaft Werkst

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“…Also, small holes were observed at the grain boundaries, the location and nature of the cavities suggest that those were formed during the etching process for metallurgical structure observation, and would not influence the corrosion stability [ 40 ]. However, there is the possibility that the loss of titanium was also connected with the etching process, because the solution used for etching could be more favorable for boundaries of grains and titanium [ 51 , 52 , 53 ].…”

Section: Resultsmentioning

confidence: 99%

Microstructure and Porosity Evolution of the Ti–35Zr Biomedical Alloy Produced by Elemental Powder Metallurgy

et al. 2020

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In the present study, the structure and porosity of binary Ti–35Zr (wt.%) alloy were investigated, allowing to consider powder metallurgy as a production method for new metallic materials for potential medical applications. The porous Ti–Zr alloys were obtained by milling, cold isostatic pressing and sintering. The pressure during cold isostatic pressing was a changing parameter and was respectively 250, 500, 750 and 1000 MPa. The X-ray diffraction study revealed only the α phase, which corresponds to the Ti–Zr phase diagram. The microstructure of the Ti–35Zr was observed by optical microscopy and scanning electron microscopy. These observations revealed that the volume fraction of the pores decreased from over 20% to about 7% with increasing pressure during the cold isostatic pressing. The microhardness measurements showed changes from 137 HV0.5 to 225 HV0.5.

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“…It was observed that the elastic modulus of Ti25Ta25Nb3Sn (65 GPa) was lower than Ti CP (110 GPa) and Ti6Al4V. The Young's modulus value was slightly higher than Ti25Ta25Nb alloy (55 GPa), however, the addition of Sn suppresses the transformation β to α″ verified to ternary alloy in the elastic deformation known as 'double yielding' [23]. A drop was observed in Ti25Ta25Nb3Sn, which can be attributed to stressinduced α″ formation during deformation [24].…”

Section: Resultsmentioning

confidence: 99%

Development of a new quaternary alloy Ti–25Ta–25Nb–3Sn for biomedical applications

Seixas¹,

Bortolini²,

Pereira³

et al. 2018

Mater. Res. Express

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Metallic biomaterials have been used for biomedical applications, such as cardiovascular, orthopaedics and orthodontics, due to excellent properties. In this study, the mechanical properties and corrosion resistance of new quaternary alloy Ti25Ta25Nb3Sn were evaluated. Alloys were processing in arc melting furnace with argon atmosphere and cold worked by rotary swaging. Alloy microstructure, crystalline phases and mechanical properties such as Young's modulus, yield strength and tensile strength were evaluated. Corrosion resistance was investigated in fluoride solution by electrochemical polarization and biocompatibility with human dermal fibroblasts were also evaluated. In our study, for quaternary alloy Ti25Ta25Nb3Sn the stabilization of beta phase was maintained. It was observed that the elastic modulus of Ti25Ta25Nb3Sn (65 GPa) was lower than CP Ti (105 GPa) and Ti6Al4V (110 GPa) and slightly higher than Ti25Ta25Nb (55 GPa) alloy. The addition of Sn suppressed the double yielding verified on ternary alloy Ti25Ta25Nb.Electrochemical studies showed that stable passive oxide film was formed on the Ti25Ta25Nb3Sn surface and an increase of HDF adhesion and proliferation on alloy surface, indicating that the alloy is noncytotoxic may provide a favorable material for biomedical applications. Results obtained showed that Ti25Ta25Nb3Sn alloy is indicated for biomedical applications.

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Effects of Sn and Zr on the Microstructure and Mechanical Properties of Ti-Ta-Based Shape Memory Alloys

Cited by 34 publications

References 19 publications

Microstructures and mechanical properties of as‐cast titanium–zirconium–molybdenum ternary alloys

Microstructures and mechanical properties of as‐cast titanium–zirconium–molybdenum ternary alloys

Microstructure and Porosity Evolution of the Ti–35Zr Biomedical Alloy Produced by Elemental Powder Metallurgy

Development of a new quaternary alloy Ti–25Ta–25Nb–3Sn for biomedical applications

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