A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Influence of annealing on microstructure and mechanical properties of ultrafine-grained Ti45Nb
Beta-Ti alloys have been intensively investigated in the last years because of their favorable low Young's moduli,biocompatibility and bio-inertness, making these alloys interesting candidates for implant materials. Due to theirlow mechanical strength, efforts are currently devoted to increasing it. A promising way to improve the strengthis to tailor the microstructure using severe plastic deformation (SPD). In this investigation high pressure torsionwas used to refine the microstructure of a Ti-45wt.%Nb alloy inducing a grain size of ~50 nm. The main focus ofthe subsequent investigations was devoted to the thermal stability of the microstructure. Isochronal heat-treatments performed for 30 min in a temperature range up to 500 °C caused an increase of hardness with apeak value at 300 °C before the hardness decreased at higher temperatures. Simultaneously, a distincttemperature-dependent variation of the Young's modulus was also measured. Tensile tests revealed an increasein strength after annealing compared to the SPD-state. Microstructural investigations showed that annealingcauses the formation ofα-Ti. Thefindings suggest that the combination of severe plastic deformation with sub-sequent heat treatment provides a feasible way to improve the mechanical properties of SPD-deformedβ-Ti al-loys making them suitable for higher strength applications
Influence of annealing on microstructure and mechanical properties of ultrafine-grained Ti45Nb
Beta-Ti alloys have been intensively investigated in the last years because of their favorable low Young's moduli,biocompatibility and bio-inertness, making these alloys interesting candidates for implant materials. Due to theirlow mechanical strength, efforts are currently devoted to increasing it. A promising way to improve the strengthis to tailor the microstructure using severe plastic deformation (SPD). In this investigation high pressure torsionwas used to refine the microstructure of a Ti-45wt.%Nb alloy inducing a grain size of ~50 nm. The main focus ofthe subsequent investigations was devoted to the thermal stability of the microstructure. Isochronal heat-treatments performed for 30 min in a temperature range up to 500 °C caused an increase of hardness with apeak value at 300 °C before the hardness decreased at higher temperatures. Simultaneously, a distincttemperature-dependent variation of the Young's modulus was also measured. Tensile tests revealed an increasein strength after annealing compared to the SPD-state. Microstructural investigations showed that annealingcauses the formation ofα-Ti. Thefindings suggest that the combination of severe plastic deformation with sub-sequent heat treatment provides a feasible way to improve the mechanical properties of SPD-deformedβ-Ti al-loys making them suitable for higher strength applications
Influence of annealing on microstructure and mechanical properties of ultrafine-grained Ti45Nb
Völker, B. (author) / Maier-Kiener, V. (author) / Werbach, K. (author) / Mueller, Timo (author) / Pilz, S. (author) / Calin, M. (author) / Eckert, J. (author) / Hohenwarter, Anton (author)
2019-01-01
Materials and design 179, 107864 (2019). doi:10.1016/j.matdes.2019.107864
Article (Journal)
Electronic Resource
English
Influence of annealing on microstructure and mechanical properties of ultrafine-grained Ti45Nb
| DataCite | 2019
Microstructure and Mechanical Properties of Ultrafine-Grained Materials
| British Library Online Contents | 1994
| British Library Online Contents | 2014