Micro-patterning by thermoplastic forming of Ni-free Ti-based bulk metallic glasses

Bera, Supriya; Sarac, Baran; Balakin, Sascha; Ramasamy, Parthiban; Stoica, M.; Calin, Mariana; Eckert, J.

doi:10.1016/j.matdes.2017.01.080

Cited by 28 publications

(19 citation statements)

References 44 publications

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“…Such results are of prime importance as they evidence the potential of the alloy for shaping processes around T g . Easy and economic forging process or surface texturization [34,35,36] could be for example possible at 420 °C while maintaining an almost fully amorphous state.…”

Section: Discussionmentioning

confidence: 99%

On the Potential of Bulk Metallic Glasses for Dental Implantology: Case Study on Ti40Zr10Cu36Pd14

et al. 2018

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Ti40Zr10Cu36Pd14 Bulk Metallic Glass (BMG) appears very attractive for future biomedical applications thanks to its high glass forming ability, the absence of toxic elements such as Ni, Al or Be and its good mechanical properties. For the first time, a complete and exhaustive characterization of a unique batch of this glassy alloy was performed, together with ISO standard mechanical tests on machined implant-abutment assemblies. The results were compared to the benchmark Ti-6Al-4V ELI (Extra-Low-Interstitial) to assess its potential in dental implantology. The thermal stability, corrosion and sterilization resistance, cytocompatibility and mechanical properties were measured on samples with a simple geometry, but also on implant-abutment assemblies’ prototypes. Results show that the glassy alloy exhibits a quite high thermal stability, with a temperature range of 38 °C between the glass transition and crystallization, a compressive strength of 2 GPa, a certain plastic deformation (0.7%), a hardness of 5.5 GPa and a toughness of 56 MPa.√m. Moreover, the alloy shows a relatively lower Young’s modulus (96 GPa) than the Ti-6Al-4V alloy (110–115 GPa), which is beneficial to limit bone stress shielding. The BMG shows a satisfactory cytocompatibility, a high resistance to sterilization and a good corrosion resistance (corrosion potential of −0.07 V/SCE and corrosion current density of 6.0 nA/cm2), which may ensure its use as a biomaterial. Tests on dental implants reveal a load to failure 1.5-times higher than that of Ti-6Al-4V and a comparable fatigue limit. Moreover, implants could be machined and sandblasted by methods usually conducted for titanium implants, without significant degradation of their amorphous nature. All these properties place this metallic glass among a promising class of materials for mechanically-challenging applications such as dental implants.

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Section: Discussionmentioning

confidence: 99%

On the Potential of Bulk Metallic Glasses for Dental Implantology: Case Study on Ti40Zr10Cu36Pd14

et al. 2018

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“…In this sense, the S parameter reflects the thermoplastic formability of studied Ti-based BMGs at least to a certain extent. For instance, the Ti 45 Zr 20 Be 27 Co 8 alloy possesses an S value of 0.194, which is much larger compared with the base alloy (0.128) and other Ti-based BMGs (<0.14) [40][41][42], indicating that Co alloying is helpful to develop Ti-based BMGs with better thermoplastic formability.…”

Section: Thermoplastic Formabilitymentioning

confidence: 99%

Preparation, Characterization, and Properties of Novel Ti-Zr-Be-Co Bulk Metallic Glasses

Gong

Jin

2020

Materials

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We developed novel Ti-Zr-Be-Co bulk metallic glasses through Co addition based on a ternary Ti45Zr20Be35 alloy. By altering the alloying routes and alloying contents, the influence of Co alloying on glass-forming ability, thermal stability, thermoplastic formability, crystallization behavior, and corrosion resistance has been investigated systematically. It was found that the best alloying route for enhancing the glass-forming ability, thermoplastic formability, compressive plasticity, and corrosion resistance is to replace Be by Co. Ti45Zr20Be23Co12 possesses the largest critical diameter of 15 mm for glass formation. Ti45Zr20Be27Co8 possesses the highest thermoplastic formability which is comparable to that of Vitreloy alloys. Ti45Zr20Be25Co10 exhibits the largest room temperature plasticity of 15.7% together with a high specific strength of 3.90 × 105 Nm/kg. The addition of Co also strongly affects the crystallization behavior of the base alloy, resulting in a more complex crystallization process. The corrosion resistance of Ti-Zr-Be alloy in 1 mol/L HCl solution can also be enhanced by Co alloying. The related mechanisms have been explained in detail, which provide guidance for the composition design of Ti-based metallic glasses with improved properties.

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“…In addition, it also has favorable mechanical properties, which—as in case of conventional crystalline materials—depend on the grain size (Hall–Petch relationship), with Ti-based amorphous alloys possessing ultrahigh strength and hardness [1,2,3]. Unfortunately, the bulk amorphous alloys still do not display sufficient ductility for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…Amorphous and nanostructured materials have attracted extensive interest because they possess unique properties that can rarely be found in microcrystalline materials [1,2,3,4,5]. …”

Section: Introductionmentioning

confidence: 99%

Phase Transformation and Morphology Evolution of Ti50Cu25Ni20Sn5 during Mechanical Milling

et al. 2018

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Nanocrystalline/amorphous powder was produced by ball milling of Ti50Cu25Ni20Sn5 (at.%) master alloy. Both laser diffraction particle size analyzer and scanning electron microscope (SEM) were used to monitor the changes in the particle size as well as in the shape of particles as a function of milling time. During ball milling, the average particle size decreased with milling time from >320 µm to ~38 µm after 180 min of milling. The deformation-induced hardening and phase transformation caused the hardness value to increase from 506 to 779 HV. X-ray diffraction (XRD) analysis was used to observe the changes in the phases/amorphous content as a function of milling time. The amount of amorphous fraction increased continuously until 120 min milling (36 wt % amorphous content). The interval of crystallite size was between 1 and 10 nm after 180 min of milling with 25 wt % amorphous fractions. Cubic Cu(Ni,Cu)Ti2 structure was transformed into the orthorhombic structure owing to the shear/stress, dislocations, and Cu substitution during the milling process.

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Micro-patterning by thermoplastic forming of Ni-free Ti-based bulk metallic glasses

Cited by 28 publications

References 44 publications

On the Potential of Bulk Metallic Glasses for Dental Implantology: Case Study on Ti40Zr10Cu36Pd14

On the Potential of Bulk Metallic Glasses for Dental Implantology: Case Study on Ti40Zr10Cu36Pd14

Preparation, Characterization, and Properties of Novel Ti-Zr-Be-Co Bulk Metallic Glasses

Phase Transformation and Morphology Evolution of Ti50Cu25Ni20Sn5 during Mechanical Milling

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