Deformation of titanium by surface oxidation

Kellerer, H.; Wingert, Lew

doi:10.1007/bf02662644

Cited by 21 publications

(6 citation statements)

References 2 publications

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“…It has also been reported that oxygen expansion of the ␣ lattice results in a net increase of the specific volume of the ␤-solutioned Ti-6Al-4V alloy, to the extent that plastic elongation could occur without applied stress. [27] Moreover, it was suggested that the hardening could be attributed to the ordering of oxygen atoms in alternating layers, which interact directly or indirectly with dislocations. [22] On the other hand, the precipitation-hardening mechanism by oxygen pickup results from the ability of oxygen to stabilize the hcp-Ti lattice and, eventually, the Ti 3 Al intermetallic precipitates, if Al content is high.…”

Section: A Ductility Exhaustion Mechanisms At Temperatures ͼ545 °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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Section: A Ductility Exhaustion Mechanisms At Temperatures ͼ545 °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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“…For the thermal treatment at 400 o C and 600 o C, titanium waste exhibits mass loss probably due to the burning of impurities present in this waste; at 700 o C is noticed a mass increase (around 2%) and can be attributed to various chemical processes including titanium oxidation. According to Kellerer and Winge [15] titanium oxidation determines also a volume increase.…”

Section: Resultsmentioning

confidence: 99%

“…The further decrease of compressive a b Fig.8. Compressive strength of AABSIPS mortars vs. temperature: a) sand; b) titanium waste strengths of these mortars with the increase of temperature up to 700 o C could be due both to the intumescent process of AABSIP paste as well as volume increase of W aggregate due to its oxidation [15]. One can also notice from figure 8 the higher mechanical strength of AABSIP mortars activated with a mixture of 70% NaOH and 30% KOH, in comparison with those activated with NaOH solution.…”

Section: Resultsmentioning

confidence: 99%

Alkali Activated Mortars with Intumescent Properties

Nicoara¹,

Bădănoiu²,

Balanoiu³

et al. 2019

Rev. Chim.

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The paper presents the properties of a new type of alkali activated borosilicate inorganic polymers (AABSIPs) resulted by the activation of waste glass powder and fly ash with alkaline solutions. The alkali activators used in this study were mixtures of borax decahydrate with NaOH and KOH solutions. For the preparation of AABSIP mortars two types of aggregates were used i.e. sand and a waste resulted during the mechanical processing of titanium alloy ingots. The thermal treatment of these pastes and mortars determines an intumescent process i.e. significant increase of volume; consequently, these materials could be used as low-cost fire stopper blocks for passive fire protection of buildings.

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“…So gibt es Untersuchungen tiber das Verhalten von Titan gegen CO 2 (11,12) Wasserdampf (13-15), Wasserdampf-Luft-Gemisch (15), Stickstoff (16-18), Luft (7, [19][20][21], Sauerstoff von etwa 1 bar (8, 9, 17, 22 -29) und Sauerstoff von 10-3 bis 10-7 bar (10, 23,24,29,30). Dennoch Hi.Bt sich aus diesen Untersuchungen kein einheiUiches Bild tiber den Oxidationsmechanismus gewinnen.…”

Section: Die Oxidation Von Titan Und Titanbasislegierungenunclassified

Untersuchung zur trockenen Hochtemperaturkorrosion von technisch genutzten Titanbasislegierungen

Winterhager¹,

Köhler²,

Krajewski³

1976

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Deformation of titanium by surface oxidation

Cited by 21 publications

References 2 publications

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

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

Alkali Activated Mortars with Intumescent Properties

Untersuchung zur trockenen Hochtemperaturkorrosion von technisch genutzten Titanbasislegierungen

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