Beta Ti alloys represent suitable candidates for interesting biomedical applications. The lower elastic modulus compared to alpha-beta alloys (e.g. Ti6Al4V), better matches that of human bones. Furthermore, their composition can be tailored to remove elements like V, detrimental to biocompatibility. Finally, their possibility to reach a fully beta structure after rapid solidification makes them very interesting alloys for additive manufacturing. In this work, the authors considered a beta Ti21S alloy powder (15%Mo, 3.2%Al, 2.8%Nb...) processed by laser powder bed fusion. The mechanical properties in the as-built state are interesting, evidencing a low elastic modulus (53GPa), good mechanical strength (Sy=700MPa, UTS=820MPa), and good fracture elongation (e=21%). The aged alloy shows a distinct strengthening at 650°C, due to the precipitation of the alpha phase, and recovery of the original solidification microstructure. The transformation is accompanied by a reduction in ductility and an increase of the elastic modulus.

Ageing behavior of Beta-Ti21S produced by laser powder bed fusion / Pellizzari, Massimo; Jam, Alireza; Tonon, Vassili; Benedetti, Matteo; Lora, Carlo. - In: LA METALLURGIA ITALIANA. - ISSN 0026-0843. - ELETTRONICO. - 2021:2(2021), pp. 42-49.

Ageing behavior of Beta-Ti21S produced by laser powder bed fusion

Pellizzari, Massimo;Jam, Alireza;Benedetti, Matteo;
2021

Abstract

Beta Ti alloys represent suitable candidates for interesting biomedical applications. The lower elastic modulus compared to alpha-beta alloys (e.g. Ti6Al4V), better matches that of human bones. Furthermore, their composition can be tailored to remove elements like V, detrimental to biocompatibility. Finally, their possibility to reach a fully beta structure after rapid solidification makes them very interesting alloys for additive manufacturing. In this work, the authors considered a beta Ti21S alloy powder (15%Mo, 3.2%Al, 2.8%Nb...) processed by laser powder bed fusion. The mechanical properties in the as-built state are interesting, evidencing a low elastic modulus (53GPa), good mechanical strength (Sy=700MPa, UTS=820MPa), and good fracture elongation (e=21%). The aged alloy shows a distinct strengthening at 650°C, due to the precipitation of the alpha phase, and recovery of the original solidification microstructure. The transformation is accompanied by a reduction in ductility and an increase of the elastic modulus.
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Pellizzari, Massimo; Jam, Alireza; Tonon, Vassili; Benedetti, Matteo; Lora, Carlo
Ageing behavior of Beta-Ti21S produced by laser powder bed fusion / Pellizzari, Massimo; Jam, Alireza; Tonon, Vassili; Benedetti, Matteo; Lora, Carlo. - In: LA METALLURGIA ITALIANA. - ISSN 0026-0843. - ELETTRONICO. - 2021:2(2021), pp. 42-49.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/299065
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