The effect of micro-alloying with Zr and Nb on the oxidation behavior of Fe3Al and FeAl alloys

Janda, Daniel; Fietzek, H.; Galetz, Mathias C.; Heilmaier, Martin

doi:10.1016/j.intermet.2013.04.016

Cited by 35 publications

(19 citation statements)

References 35 publications

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“…Parabolic growth of the oxide layer, consistent with observations of other investigators [13,17,18,19,20], is shown in Figure 4a. At 1000 °C, the increase was very small and stable, but at 1200 °C, it significantly intensified and after an initial period, became linear (sample A).…”

Section: Resultssupporting

confidence: 92%

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High-Temperature Oxidation of Fe3Al Intermetallic Alloy Prepared by Additive Manufacturing LENS

Łyszkowski

2015

Materials

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The isothermal oxidation of Fe-28Al-5Cr (at%) intermetallic alloy microalloyed with Zr and B (<0.08 at%) in air atmosphere, in the temperature range of 1000 to 1200 °C, was studied. The investigation was carried out on the thin-walled (<1 mm) elements prepared by Laser Engineered Net Shaping (LENS) from alloy powder of a given composition. Characterization of the specimens, after the oxidation, was conducted using X-ray diffraction (XRD) and scanning electron microscopy (SEM, with back-scatter detector (BSE) and energy-dispersive X-ray spectroscopy (EDS) attachments). The investigation has shown, that the oxidized samples were covered with a thin, homogeneous α-Al2O3 oxide layers. The intensity of their growth indicates that the material lost its resistance to oxidation at 1200 °C. Structural analysis of the thin-walled components’ has not shown intensification of the oxidation process at the joints of additive layers.

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Section: Resultssupporting

confidence: 92%

“…Thermal contraction associated with cooling causes exfoliation. Other authors confirm very good oxidation resistance of Fe-Al compounds [14,15,16], especially those alloyed with Zr [17,18,19], Nb [20], Ce [21], and Y 2 O 3 [22]. …”

Section: Introductionmentioning

confidence: 93%

High-Temperature Oxidation of Fe3Al Intermetallic Alloy Prepared by Additive Manufacturing LENS

Łyszkowski

2015

Materials

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“…Furthermore, no signs of internal oxidation along the phase boundaries are observed. Therefore, it can be inferred that in previous publications [13,14] not the phase boundaries itself but rather the presence of reactive elements like Zr yield the nucleation sites for the observed internal oxidation.…”

Section: Oxide Scalementioning

confidence: 77%

“…Finally, we examine the possibility of internal oxidation. This may likely occur because of the high interface density which promotes fast oxygen inward diffusion through the phase boundaries and has been observed several times already for FeAl alloys [13,14].…”

Section: Introductionmentioning

confidence: 76%

Oxidation Behavior of Binary Aluminium-Rich Fe–Al Alloys with a Fine-Scaled, Lamellar Microstructure

et al. 2015

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The oxidation behavior of binary Fe-Al alloys with an aluminum content between 58 and 64 at.% was studied by isothermal and cyclic oxidation experiments in a temperature range of 900-1000°C. The parabolic rate constants were determined to be comparable to those of B2-ordered Fe-48Al. All investigated alloys exhibited a fine-scaled, lamellar microstructure (\300 nm lamellar spacing), which was a result of the eutectoid decomposition of the high-temperature phase Fe 5 Al 8 into FeAl and FeAl 2 . None of these two phases showed a preferential oxidation. At 900°C h-Al 2 O 3 formed, whereas at 1000°C a transformation of the initially formed h-Al 2 O 3 to the slower growing and passivating a-Al 2 O 3 was confirmed by grazing incidence X-ray diffraction measurements.

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“…It is reported that the addition of Si in Al melts not only affected the phase constitution in the HDA process, resulting in the formation of Si containing phases, but also changed the interface structures and thickness of formed aluminide coatings [49]. Janda et al [94] also pointed out that the transformation temperature of g-Al 2 O 3 to a-Al 2 O 3 on the surfaces of FeAl base alloys changed from 950 C to 750 C with the addition of Zr and Nb elements. According to the material science point that the property is determined by the composition and structure, it is obvious that different alloying elements will exert different influences on the formation and performance of aluminide coatings.…”

Section: Element Speciesmentioning

confidence: 99%

Preparation technique and alloying effect of aluminide coatings as tritium permeation barriers: A review

Xiang

Wang

Zhang

et al. 2015

International Journal of Hydrogen Energy

114

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The effect of micro-alloying with Zr and Nb on the oxidation behavior of Fe3Al and FeAl alloys

Cited by 35 publications

References 35 publications

High-Temperature Oxidation of Fe3Al Intermetallic Alloy Prepared by Additive Manufacturing LENS

High-Temperature Oxidation of Fe3Al Intermetallic Alloy Prepared by Additive Manufacturing LENS

Oxidation Behavior of Binary Aluminium-Rich Fe–Al Alloys with a Fine-Scaled, Lamellar Microstructure

Preparation technique and alloying effect of aluminide coatings as tritium permeation barriers: A review

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