Microhardness and lattice parameter calibrations of the oxygen solid solutions of unalloyed α-titanium and Ti-6Al-2Sn-4Zr-2Mo

Wiedemann, K. E.; Shenoy, R. N.; Unnam, J.

doi:10.1007/bf02646662

Cited by 42 publications

(22 citation statements)

References 4 publications

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“…Other researchers demonstrated that the hardness increases with the amount of oxygen content in solution. [2,[10][11][12] The trend is similar to that reported by Wood and the results confirmed that the oxide was dissolved during the solutionizing treatment and the oxygen went into solution.…”

Section: Characterization Of the Foams After Oxidation And Solutionizsupporting

confidence: 87%

“…However, this evaluation method is not precise and authors have reported different colors for oxide films having similar thicknesses. [12,13] This is because the color of oxide films does not only depend on their thickness but also on their refraction index that is affected by their composition and structure. This paper presents a simple method to discriminate the amount of oxygen coming from the oxide and from the solid solution in titanium foams.…”

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confidence: 99%

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Effect of Oxygen Concentration and Distribution on the Compression Properties on Titanium Foams

Lefebvre¹,

Baril²

2008

Adv Eng Mater

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The effect of oxygen in solution and surface oxide on the properties of titanium foams under compression is discussed in this report. The authors present a simple method to discriminate the amount of oxygen coming from the oxide and from the solid solution. Oxygen in solution has an impact on the hardness, yield strength and ductility while surface oxide has little impact on the compression properties within the concentration evaluated.

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Section: Characterization Of the Foams After Oxidation And Solutionizsupporting

confidence: 87%

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confidence: 99%

Effect of Oxygen Concentration and Distribution on the Compression Properties on Titanium Foams

Lefebvre¹,

Baril²

2008

Adv Eng Mater

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“…This represents a value between 4.5 and 7 wt pct in the case of the Timetal-21S alloy; Appendix A contains the conversion to consistent units. Also, Wiedemann et al [20] reported a value close to 2 wt pct in pure ␣-titanium exposed for 15 hours at 777 °C. However, it is difficult to use these data, since Timetal-21S has significantly improved oxidation resistance as compared to pure Ti.…”

Section: A Basic Theoretical Considerationsmentioning

confidence: 93%

“…This may also elucidate the origin of ductility loss at elevated temperatures (Ͼ545 °C) in the ductile region contaminated by diffused oxygen. In this region, it may be considered that oxygen, which occupies preferentially the alpha-phase unit cell by increasing the c lattice with no significant effect on the a lattice, [20,37] results in a solute deficiency of Mo in the alpha phase and enrichment of this element in the beta phase, thus leading to lower ductility. Further examinations of exposed specimens using X-ray techniques are currently being carried out by the authors in order to establish the validity of the partitioning concepts presented here.…”

Section: B Ductility Exhaustion Mechanisms At Temperatures ͻ545 °Cmentioning

confidence: 99%

Ductility exhaustion mechanisms in thermally exposed thin sheets of a near-β titanium alloy

Sansoz

Almesallmy

Ghonem

2004

Metall Mater Trans A

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This study examines the effects of thermal exposure in air environment on the plastic elongation of thin sheets of Ti-15Mo-2.7Nb-3Al-0.2Si (Timetal-21S) alloy. Specimens with thicknesses of 0.12, 0.39, and 1.0 mm were exposed in air environment to temperatures ranging from 482 °C to 693 °C. Tensile tests conducted on these specimens at room temperature show a reduction of plastic elongation proportional to the thermal exposure parameters, time and temperature. Furthermore, a change in the failure mode into a quasi-brittle fracture was observed in the near-surface region. The depth of this region depends on both exposure time and temperature. The kinetics of embrittlement is studied through theoretical considerations of gas diffusion into metal. This approach shows that two distinct embrittlement mechanisms operate in this alloy. The characteristics of each of these mechanisms depend on the corresponding temperature range. At temperatures higher than 545 °C, the embrittlement activation energy is 41.2 kcal и mol Ϫ1 , indicating that the embrittlement process is governed by an enhanced diffusion of oxygen into Timetal-21S. Below this transitional temperature, the embrittlement activation energy approaches zero, a characteristic of slow kinetics transformation. The effects of solid-solution hardening, precipitation-hardening mechanisms, and alloying-element partitioning on ductility exhaustion processes are analyzed and discussed.

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“…As expected, the rutile-based ␣ phase. [28] oxide formed during TO processing possesses a much higher wettability than untreated titanium, as it has a surface with V. CONCLUSIONS a higher ionic character. [25] Overall, the application of a surface-engineering treatment 5.…”

Section: B the Xrd And Surface-chemical Profilesmentioning

confidence: 99%

Surface engineering of timet 550 with oxygen to form a rutile-based, wear-resistant coating

Boettcher¹,

Bell

Dong

2002

Metall Mater Trans A

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Recently, a thermal oxidation (TO) technique has been successfully developed and applied to the titanium alloy Ti-6Al-4V. This TO technique produces a thin, hard, rutile-based, wear-resistant coating on the surface of the titanium alloy, thus significantly improving the tribological properties of the titanium alloy. In the present investigation, the same principle has been applied to the ␣ ϩ ␤ highstrength titanium alloy Timet 550. A series of TO treatments have been carried out in air within the temperature range of 600 ЊC to 650 ЊC. This developed a rutile-based coating which greatly improved the tribological properties of Timet 550. Systematic characterization of the TO-treated surface was carried out using glow-discharge optical emission spectroscopy (GDS), X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution scanning electron microscopy (HR-SEM) techniques. Ball-on-disc friction testing was used to show the improvement in tribological properties for Timet 550 when TO treated. The sliding wear resistance of the TO treatment was investigated using an Amsler wear tester, utilizing a counterformal block-on-wheel configuration; the TO-treated Timet 550 was run against a carburized S156 steel with splash oil lubrication. It was found that the wear resistance of the TO-treated Timet 550 was greatly improved.

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Microhardness and lattice parameter calibrations of the oxygen solid solutions of unalloyed α-titanium and Ti-6Al-2Sn-4Zr-2Mo

Cited by 42 publications

References 4 publications

Effect of Oxygen Concentration and Distribution on the Compression Properties on Titanium Foams

Effect of Oxygen Concentration and Distribution on the Compression Properties on Titanium Foams

Ductility exhaustion mechanisms in thermally exposed thin sheets of a near-β titanium alloy

Surface engineering of timet 550 with oxygen to form a rutile-based, wear-resistant coating

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