Non-classical interstitial sites and anomalous diffusion mechanisms in hcp-titanium

Scotti, Lucia; Warnken, Nils; Mottura, Alessandro

doi:10.1016/j.actamat.2019.07.023

Cited by 6 publications

(3 citation statements)

References 38 publications

(115 reference statements)

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“…The elemental map for the element V (Figure 10(c)) is in marked contrast, with V being distributed more or less randomly. This result is consistent with the notion that Ni is a very fast diffuser in a-Ti [20]. From this result, it is tempting to speculate that the thin laths in Figure 10(a) are indeed not a¢ martensite, as there is a composition difference with the matrix (i.e., b phase), although it is possible that a¢ martensite formed first with rapid diffusion of Ni from the martensitic laths producing the compositional differences observed.…”

Section: Metallurgical Consequences Of Additions Of B-eutectoid Elements To Existing Ti Alloyssupporting

confidence: 86%

“…Application of TEM to assess whether an intermetallic compound had formed on a scale that would not be observed in an SEM image revealed no such precipitation. Both Ni and Fe are known to diffuse very rapidly in a-Ti, [20] so the difference in the behavior between these two alloys regarding precipitation of intermetallic compounds is probably more due to other factors such as the difference in driving force for nucleation of the two intermetallic compounds, and the differences in nucleation barriers (e.g., coherency). Using MIPAR software, image analysis has been used to quantify the microstructure of the Fe-containing alloy, with the following results: the volume fraction of the b phase is % 30 pct and the average lath thickness is % 0.15 lm.…”

Section: Metallurgical Consequences Of Additions Of B-eutectoid Elements To Existing Ti Alloysmentioning

confidence: 99%

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Use of Alloying to Effect an Equiaxed Microstructure in Additive Manufacturing and Subsequent Heat Treatment of High-Strength Titanium Alloys

Welk

Taylor

Kloenne

et al. 2021

Metall Mater Trans A

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This paper addresses the use of alloying additions to titanium alloys for additive manufacturing (AM) with the specific objective of producing equiaxed microstructures. The additions are among those that increase freezing ranges such that significant solutal undercooling results when combined with the rapid cooling rates associated with AM, and so be effective in inducing a columnar-to-equiaxed transition (CET). Firstly, computational thermodynamics has been used to provide a simple graphical means of predicting these additions; this method has been used to explore additions of Ni and Fe to the alloy Ti–6Al–4V (Ti64). Secondly, an experimental means of determining the minimum concentration of these alloying elements required to effect the CET has been developed involving gradient builds. Thirdly, it has been found that additions of Fe to Ti64 cause the alloy to change from an α/β Ti alloy to being a metastable β-Ti alloy, whereas additions of Ni do not produce the same result. This change in type of Ti alloy results in a marked difference in the development of microstructures of these compositionally modified alloys using heat treatments. Finally, hardness measurements have been used to provide a preliminary assessment of the mechanical response of these modified alloys.

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Section: Metallurgical Consequences Of Additions Of B-eutectoid Elements To Existing Ti Alloyssupporting

confidence: 86%

Section: Metallurgical Consequences Of Additions Of B-eutectoid Elements To Existing Ti Alloysmentioning

confidence: 99%

Use of Alloying to Effect an Equiaxed Microstructure in Additive Manufacturing and Subsequent Heat Treatment of High-Strength Titanium Alloys

Welk

Taylor

Kloenne

et al. 2021

Metall Mater Trans A

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“…Ni in h.c.p. Ti [19]. Typically, at the first stages this process develops through the layers' interface and along the grain boundaries.…”

Section: Resultsmentioning

confidence: 99%

Effect of Modulation Period on the Thermally-Induced Solid-State Reactions in Ni/Ti Thin Films

Kruhlov,

Franchik,

Voloshko

et al. 2024

Metallofiz. Noveishie Tekhnol.

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In this work, we have studied the structure evolution of Ni/Ti layered stacks with a modulation period of 30 nm and 15 nm (total thickness of the stack is of 60 nm) deposited by RF magnetron sputtering onto p-Si (001) substrate upon vacuum annealing up to 700°C. As found based on the XRD, SIMS and four-point probe resistivity measurements' data, the diffusion-induced reactions in both stacks occur through the stages of metals' intermixing, amorphization and formation of intermetallic NixTi phases. The application of a smaller modulation period leads to the more intense metals' intermixing, which results in the shift of the structural transitions onset to the lower temperatures. However, the modulation period does not influence the temperature range of amorphization, which is of ≅ 38°C for both stacks.

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A semi-analytical approach to Caputo type time-fractional modified anomalous sub-diffusion equations

Kheybari

Darvishi

Hashemi

2020

Applied Numerical Mathematics

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Non-classical interstitial sites and anomalous diffusion mechanisms in hcp-titanium

Cited by 6 publications

References 38 publications

Use of Alloying to Effect an Equiaxed Microstructure in Additive Manufacturing and Subsequent Heat Treatment of High-Strength Titanium Alloys

Use of Alloying to Effect an Equiaxed Microstructure in Additive Manufacturing and Subsequent Heat Treatment of High-Strength Titanium Alloys

Effect of Modulation Period on the Thermally-Induced Solid-State Reactions in Ni/Ti Thin Films

A semi-analytical approach to Caputo type time-fractional modified anomalous sub-diffusion equations

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