Transformation-induced plasticity in omega titanium

Zahiri, Amir Hassan; Ombogo, Jamie; Ma, Tengfei; Chakraborty, Pranay; Cao, Lei

doi:10.1063/5.0035465

Cited by 10 publications

(3 citation statements)

References 48 publications

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“…To keep the two main crystallographic states of titanium stable, HCP (α phase) at temperatures lower than (883 °C) and BCC (β phase) at temperatures more than (883 °C) [5,6], certain elements, such as N, Al, O, Nb, and Ta be added. These elements are referred to as α or β stabilizers [7].…”

Section: Introductionmentioning

confidence: 99%

The investigation on properties of Ti- 5Si and Ti- 5Nb implant alloys coated by bioactive based composite coating

Jabbar,

Jamal Abdulkader,

Ahmed

2024

Mater. Res. Express

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Titanium (Ti) alloys are widely utilized in orthopedics owing to their excellent mechanical properties and biocompatibility. To improve their resistance to corrosion and ion release properties, substrates of Ti alloy have been produced employing powder metallurgy by adding alloying elements (Si and Nb) at 5wt.% along with CP-Ti. Two torch flame sprays have been utilized for coating the Ti-5Nb and Ti-5Si alloys with two kinds of nanocoating: HAp+25%SiC (type-A) and ZSM5+25%ZrO2 (type-B). These nanocoating combinations represented bioactive and bioinert to combine the biological and mechanical properties of the implant surface. Different tests and characterization techniques have been carried out, including SEM, XRD, AFM, AAS, hardness, adhesion strength, and corrosion resistance. The results manifested that the coatings (types A and B) improved the properties of Ti alloys; however, ZSM5+25%ZrO2 has better properties than type-A in terms of less porosity, higher crystallinity%, higher hardness, higher adhesion strength, lower corrosion rate, and less Ti ions release. Comparing the results of the two Ti alloys, Ti-5Si has higher hardness, corrosion resistance, and less ionic release than the Ti-5Nb alloy. Hence, the Ti-5Si coated by ZSM5+25%ZrO2 (B coated Ti-5Si) is the best sample in this study.

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Section: Introductionmentioning

confidence: 99%

The investigation on properties of Ti- 5Si and Ti- 5Nb implant alloys coated by bioactive based composite coating

Jabbar,

Jamal Abdulkader,

Ahmed

2024

Mater. Res. Express

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“…However, Cp-Ti and Ti6Al4V are predominantly utilized clinically owing to their enhanced mechanical properties such as high strength, low modulus of elasticity, improved biocompatibility, and excellent resistance to corrosion [23][24][25][26]. In general, titanium exists in two different crystallographic forms, i.e., below 883 • C it is HCP (alpha phase) whereas above 883 • C it changes to BCC structure (beta phase) [27,28]. Nevertheless, such polymorphs need to be stabilized by the addition of certain elements such as Nb, Ta (for beta structure), Al, O, and N (for alpha phase) [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Ti-Sn Alloy for Orthopedic Application

2021

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Titanium (Ti)-based alloys (e.g., Ti6Al4V) are widely used in orthopedic implant applications owing to their excellent mechanical properties and biocompatibility. However, their corrosion resistance needs to be optimized. In addition, the presence of aluminum and vanadium cause alzheimer and cancer, respectively. Therefore, in this study, titanium-based alloys were developed via powder metallurgy route. In these alloys, the Al and V were replaced with tin (Sn) which was the main aim of this study. Four sets of samples were prepared by varying Sn contents, i.e., 5 to 20 wt. %. This was followed by characterization techniques including laser particle analyzer (LPA), X-ray diffractometer (XRD), scanning electron microscope (SEM), computerized potentiostate, vicker hardness tester, and nanoindenter. Results demonstrate the powder sizes between 50 and 55 µm exhibiting very good densification after sintering. The alloy contained alpha at all concentrations of Sn. However, as Sn content in the alloy exceeded from 10 wt. %, the formation of intermetallic compounds was significant. Thus, the presence of such intermetallic phases are attributed to enhanced elastic modulus. In particular, when Sn content was between 15 and 20 wt. % a drastic increase in elastic modulus was observed thereby surpassing the standard/reference alloy (Ti6Al4V). However, at 10 wt. % of Sn, the elastic modulus is more or less comparable to reference counterpart. Similarly, hardness was also increased in an ascending order upon Sn addition, i.e., 250 to 310 HV. Specifically, at 10 wt. % Sn, the hardness was observed to be 250 HV which is quite near to reference alloy, i.e., 210 HV. Moreover, tensile strength (TS) of the alloys were calculated using hardness values since it was very difficult to prepare the test coupons using powders. The TS values were in the range of 975 to 1524 MPa at all concentrations of Sn. In particular, the TS at 10 wt. % Sn is 1149 MPa which is comparable to reference counterpart (1168 MPa). The corrosion rate of Titanium-Sn alloys (as of this study) and reference alloy, i.e., Ti6Al4V were also compared. Incorporation of Sn reduced the corrosion rate at large than that of reference counterpart. In particular, the trend was in decreasing order as Sn content increased from 5 to 20 wt. %. The minimum corrosion rate of 3.65 × 10−9 mm/year was noticed at 20 wt. % than that of 0.03 mm/year of reference alloy. This shows the excellent corrosion resistance upon addition of Sn at all concentrations.

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“…Titanium alloys are widely used in aerospace, marine engineering, biomedical and other fields owing to their low density, high specific strength, high corrosion resistance and high biocompatibility. Similar to most metal applied in industry, titanium is holding several allotropes which including α-Ti (HCP structure), β-Ti (BCC structure) and some intermediate phase retained between the β → α transformation [1]. For the category of titanium type at room temperature, one can classify them into three main type which including α, β and α + β type based on their β phase composition.…”

Section: Introductionmentioning

confidence: 99%

The Characteristic of Fe as a β-Ti Stabilizer in Ti Alloys

et al. 2021

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It is well known that adding elements, especially β-Ti stabilizers, are holding a significant effect on titanium alloy strength due to the solution and precipitate strengthening mechanisms. In order to reveal the Fe strengthening mechanism in titanium, this study investigate the effect of Fe on the stability of β-Ti and the phase transition between α, β and ω phase with first-principle calculations. According to our study, Fe is a strong β-Ti phase stabilizer could owe to the 3d orbital into eg and t2g states which results in strong hybridization between Fe-d orbital and Ti-d orbital. The phase transition from ω to β or from α to β becomes easier for Fe-doped Ti compared to pure titanium. Based on our results, it is found that one added Fe atom can lead the phase transition (ω → β) of at least nine titanium atoms, which further proves that Fe has a strong stabilizing effect on β-Ti phase. This result provides a solid guide for the future design of high-strength titanium with the addition of Fe.

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Transformation-induced plasticity in omega titanium

Cited by 10 publications

References 48 publications

The investigation on properties of Ti- 5Si and Ti- 5Nb implant alloys coated by bioactive based composite coating

The investigation on properties of Ti- 5Si and Ti- 5Nb implant alloys coated by bioactive based composite coating

Synthesis and Characterization of Ti-Sn Alloy for Orthopedic Application

The Characteristic of Fe as a β-Ti Stabilizer in Ti Alloys

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