Oxidation characteristics of Ti-25Al-10Nb-3V-1Mo

Wallace, Terryl A.; Clark, R. K.; Wiedemann, K. E.; Sankaran, Sankara N.

doi:10.1007/bf00665185

Cited by 50 publications

(6 citation statements)

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“…In the oxidation in N2-O2, layers D (TiN), E (Nb2Al) and F (TiAl) were formed beneath layer C. The nitride was identified as TiN by XRD, EPMA (EDS and WDS), SEM, and optical observation. This result agrees with the result of Wallace et al [8]. Thermodynamic possibility of selective nitridation will be discussed in another paper [4].…”

Section: Metallography and Analysessupporting

confidence: 91%

INFLUENCE OF NITROGEN GAS ON THE HIGH-TEMPERATURE OXIDATION CHARACTERISTICS OF Ti-14Al-21Nb (MASS%)

Akai

Taniguchi

Shibata

1996

Journal of the Society of Materials Science, Japan

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The oxidation characteristics of Ti-14Al-21Nb has been studied with an emphasis on the influence of nitrogen. The oxidation curve in N2-21%O2 is significantly lower than in O2 or in Ar-21%O2 at 1300 K. At the scale/substrate interface, two thin continuous layers and an Al-enriched layer were formed. These three layers were identified as/TiN/Nb2Al/TiAl/ by XRD, EPMA, SEM, and optical observation. The oxidation rate is reduced by the formation of the TiN layer, although the oxidation of bulk material of TiN is as fast as Ti Alloy. This difference can be explained by such a low oxygen partial pressure at the interface that the TiN layer is kept intact.

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Section: Metallography and Analysessupporting

confidence: 91%

INFLUENCE OF NITROGEN GAS ON THE HIGH-TEMPERATURE OXIDATION CHARACTERISTICS OF Ti-14Al-21Nb (MASS%)

Akai

Taniguchi

Shibata

1996

Journal of the Society of Materials Science, Japan

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“…The present results of mass gain curves differed from the results of Ti-23Al-10.3Nb-4.5V-0.9Cr alloy at 700-900°C as reported by Tomasi and Gialanella [17], in which the weight gain curves showed a parabolic trend up to 25h, due to the growth of a compact oxide scale on the surface, but at the time longer than 50h the mass gain-exposure time showed a linear relation. Similar mass gain curves and parabolic rate constant were obtained by Wallace et al [18], they studied oxidation behavior of Ti-25Al-10Nb-3V-1Mo alloy at 650-1000°C in air, and found that the oxidation kinetics was complex and displayed up to two distinct stages of parabolic oxidation. Regardless of the microstructure, the overall tendency of oxidation resistance of the Ti-24Al-14Nb-3V-0.5Mo alloy was poor when the exposure temperature increased above 900°C.…”

Section: Discussionsupporting

confidence: 79%

The Isothermal Oxidation Behavior of a Ti3Al-Nb-V-Mo Alloy

Song¹

2010

TOCORRJ

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Abstract:The isothermal oxidation behavior of Ti-24Al-14Nb-3V-0.5Mo alloy in synthetic air from 700°C to 1000°C was studied. The main emphasis was focused on the effect of microstructure obtained by different processes of melting and hot rolling, i.e. large and duplex of 2 +B2, on the oxidation resistance. Regardless of the microstructure, the overall oxidation process of the specimens exposed at 700°C was dominantly controlled by the beneficial effect of Nb-addition due to the formation of a continuous -Al 2 O 3 layer in the scale. However, both specimens showed poor oxidation resistance above 900°C, especially for the as-rolled specimen, because of higher volume fraction of the 2 -phase. The spallation occurred in both specimens at 1000°C, which was probably relative to the formation of Ti 2 AlN between the thick scale and the substrate except for the TiO 2 and -Al 2 O 3 .

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“…Molybdenum was selected because it is an important element in high-temperature Ti alloys, such as b-21S (a b alloy) and Ti6242 (an a + b alloy). 31,[35][36][37][38][39] This approach allows for a systematic assessment of the influence of composition on the oxidation resistance of the binary titanium alloys independent of experimental variability. The materials were b-solutionized in argon, quenched, and polished prior to being subjected to the oxidation tests.…”

Section: Methodologiesmentioning

confidence: 99%

Discovery via Integration of Experimentation and Modeling: Three Examples for Titanium Alloys

Liu

Samimi

Ghamarian

et al. 2014

JOM

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One key aspect of any integrated computational materials engineering approach is the integration of experiments that provide critical information for the modeling activities. This article describes, using case studies, three examples of critical experiments that have been conducted in an integrated fashion with modeling activities for titanium alloys, providing valuable information in an accelerated manner. The first has been used to identify key microstructural features associated with fracture toughness in Ti-6Al-4V and integrates artificial neural networks and various experimental techniques. The second is associated with defect accumulation in highly constrained titanium structures and integrates a highly innovative characterization technique (precession electron diffraction) and dislocation dynamics. The third is a high-throughput combinatorial technique to understand the oxidation behavior of titanium alloys and couples the experimental effort with the CALPHAD approach. INTRODUCTIONThe composition, microstructure, and defect structures of advanced nonferrous structural alloys are the predominant factors that govern the response of the material to an externally applied stimulus. For example, there will be an elasticplastic response of the material to an externally applied load. Similarly, there will be a compositional and structural evolution in response to thermal excursions. Although these responses are expected to occur, the precise details of the responses are less well understood. integrated computational materials engineering (ICME), or integrated computational materials science and engineering (ICMSE), is a strategy to integrate knowledge, represented by both computation/simulation and high-fidelity experimental databases, from across the composition-microstructure-processing-property paradigm so as to engineer a solution to a design problem. ICME strategies are increasingly being put into service and adding value. 1-4 However, to be effective the individual components must accurately describe materials phenomena.For many structural materials, the precise details of materials response to external stimuli are not well understood. Often, an integrated experimental and computational approach can help elucidate these missing details. While not representing a complete ICME program, each of these integrated activities has provided knowledge that was otherwise lacking. Each of these programs is related to a different problem facing a particular class of nonferrous structural alloys-titanium-based alloys. These include efforts to understand the following: the influence of microstructure on the fracture toughness of a + b-processed Ti-6Al-4V, the influence of defect populations on performance of single-phase and two-phase titanium alloys, and the role of composition on the oxidation behavior of several titanium alloys. The motivation and details of each problem are described separately, as are the conclusions. It is seen that the integration of critical and careful experiments with various modeling schemes ca...

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Oxidation characteristics of Ti-25Al-10Nb-3V-1Mo

Cited by 50 publications

References 5 publications

INFLUENCE OF NITROGEN GAS ON THE HIGH-TEMPERATURE OXIDATION CHARACTERISTICS OF Ti-14Al-21Nb (MASS%)

INFLUENCE OF NITROGEN GAS ON THE HIGH-TEMPERATURE OXIDATION CHARACTERISTICS OF Ti-14Al-21Nb (MASS%)

The Isothermal Oxidation Behavior of a Ti3Al-Nb-V-Mo Alloy

Discovery via Integration of Experimentation and Modeling: Three Examples for Titanium Alloys

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