Hybrid microwave sintering of blended elemental Ti alloys

Raynova, Stiliana Rousseva; Imam, M. Ashraf; Yang, Fei; Bolzoni, Leandro

doi:10.1016/j.jmapro.2019.02.002

Cited by 46 publications

(20 citation statements)

References 29 publications

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“…The homogeneous chemistry of the sintered ternary Ti-xCu-yMn alloys confirmed via elemental mapping (Fig. 2), generally found for blended elemental alloys 30 , should ensure a uniform release of metal ions regardless of which surface of the implant will be contact with the human body and potential pathogenic bacteria. The reaction of Cu 2+ ions with biological proteins such as thiol (-SH) and amino (-NH 2 ) present in the nucleic acid reduces the activity of the protein and enzyme (i.e.…”

Section: Discussionmentioning

confidence: 66%

Ternary Ti alloys functionalised with antibacterial activity

Bolzoni

Al‐Qattan

Peters

et al. 2020

Sci Rep

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Prosthesis bacterial infection occurring during surgery is a rising health issue. Pathogenic bacterial infection causes inflammation, interferes with the healing process, inhibits osteogenesis and, eventually, leads to implant failure. These issues can be tackled either by applying coatings or developing multifunctional (i.e. structural and antibacterial) materials. In this work, β eutectoid bearing functionalised Ti alloys were designed and manufactured via the cost-effective press and sinter powder metallurgy route. The systematic analysis of the ternary Ti–xCu–yMn alloys shows that the mechanical properties proportionally increase with the amount of alloying elements added. All the ternary Ti–xCu–yMn alloys have strong antibacterial activity against Escherichia coli with respect to the negative control (i.e. pure Ti). Our study demonstrates that ternary Ti–xCu–yMn alloys are promising candidates for structural prostheses functionalised with antibacterial capability.

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Section: Discussionmentioning

confidence: 66%

Ternary Ti alloys functionalised with antibacterial activity

Bolzoni

Al‐Qattan

Peters

et al. 2020

Sci Rep

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“…The heating rate, soak time and cooling conditions were, respectively, 10°C/min, 2 h, and furnace cooling. The chosen pressing and sintering conditions were based on current literature about powder metallurgy Ti alloys 37 – 40 .…”

Section: Methodsmentioning

confidence: 99%

New ternary powder metallurgy Ti alloys via eutectoid and isomorphous beta stabilisers additions

Paul

Alshammari

Yang

et al. 2023

Sci Rep

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A group of new ternary Ti alloys bearing eutectoid and isomorphous beta stabilising elements was created to be manufactured through the conventional powder metallurgy route. The effect of the simultaneous addition of the same amount of Mn and Nb on the manufacturability, properties, and hardening behaviour was investigated. The ternary alloys are composed of the α-Ti and β-Ti phases and have a lamellar microstructure resulting from the slow cooling upon sintering. However, the size of the equiaxed α grains and of the α + β lamellae is monotonically reduced, especially the interlamellar spacing, as the amount of alloying elements increases. Due to their physical properties, Mn enhances and Nb hinders densification during sintering resulting in a decreasing trend of the relative density with the alloying elements content. Consequently, the resistance to plastic deformation increases (UTS, 514–726 MPa), the ductility decreases (elongation, 13.2–2.6%), and the fracture mode changes from intergranular to transgranular. The new ternary alloys share the same hardening mechanism, but the amount of deformation after necking is, generally, higher for lower amounts of Mn and Nb.

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“…For that, the correct amount of each powder was loaded into a mixer and blended altogether using a rotational speed of 45 rpm for 30 min. From the literature about the manufacturing of Ti-based alloys through powder metallurgy [24][25][26], it was decided to press the powder blends by applying a uniaxial pressure of 600 MPa for their subsequent vacuum sintering. The latter was done heating the samples at 10 °C/min until reaching the maximum temperature of 1300 °C, which was kept for 120 min, under a vacuum level of approximately 10 -5 mbar.…”

Section: Methodsmentioning

confidence: 99%

Titanium alloys developed on the basis of the addition of cheap strong eutectoid β-stabilisers

et al. 2023

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Historically, titanium alloys have been developed disregarding the addition of eutectoid β-stabilisers as they generally lead to the formation of brittle intermetallic phases upon solidification of the alloy. However, such phenomenon can be prevented using powder metallurgy. Thus, this study considered the concurrent addition of cheap strong eutectoid β-stabilisers, namely Mn and Fe, for the development of new ternary Ti–Mn–Fe alloys, reducing the intrinsic cost of Ti alloys. It is found that the progressive addition of Mn and Fe in equal concentration enhances the densification of Ti during sintering, leading to lower amount of residual porosity, the transformation of the microstructure from purely lamellar to metastable, and the associated refinement of the microstructural features (grains and lamellae), as well as the stabilisation of a greater amount of β phase, and the formation of the metastable α″ phase. Such microstructural changes result in the strengthening (higher yield and ultimate tensile strength and hardness) and embrittlement of the alloy by changing the fundamental strain hardening mechanism of the ternary Ti–Mn–Fe alloys.

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Hybrid microwave sintering of blended elemental Ti alloys

Cited by 46 publications

References 29 publications

Ternary Ti alloys functionalised with antibacterial activity

Ternary Ti alloys functionalised with antibacterial activity

New ternary powder metallurgy Ti alloys via eutectoid and isomorphous beta stabilisers additions

Titanium alloys developed on the basis of the addition of cheap strong eutectoid β-stabilisers

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