Structure and plasticity in hot deformed FeAl intermetallic phase base alloy

Kuc, D.; Niewielski, G.; Bednarczyk, I.

doi:10.1016/j.matchar.2009.03.020

Cited by 11 publications

(8 citation statements)

References 5 publications

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“…Moreover, the studies [36,37] carried out on the flow behavior of intermetallics with crystal structure similar to NiTi at high temperature (B2 structure), such as FeAl or Fe 3 Al showed almost the same behavior. It means that flow softening type of curve was seen at low temperatures, while a steady state one was observed at high temperatures.…”

Section: Resultsmentioning

confidence: 99%

The effect of Cu addition on the hot deformation behavior of NiTi shape memory alloys

Morakabati

Kheirandish

Aboutalebi

et al. 2010

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

The effect of Cu addition on the hot deformation behavior of NiTi shape memory alloys

Morakabati

Kheirandish

Aboutalebi

et al. 2010

Journal of Alloys and Compounds

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“…However, the Fe-Al alloys are difficult to fabricate in bulk, due to their poor castability and workability (Zhu et al, 2009); this was confirmed by Kuc et al (2009) who found that Fe-Al alloys have an activation energy for deformation of 484.9 kJ/mol compared to 392 kJ/mol for austenitic steel. The region of interest in the current study is the Fe-Al intermetallic compound at around 60 at.% Fe (Figure 1), which is a single-phase bcc region (Eelman et al, 1998).…”

mentioning

confidence: 86%

Cold-spray coating of an Fe-40 at.% Al alloy with additions of ruthenium

Couperthwaite

Cornish

Mwamba

2016

J. South. Afr. Inst. Min. Metall.

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Previous work conducted by Mintek (Couperthwaite et al., 2013(Couperthwaite et al., , 2015 investigated the effect of precious metal additions on the structure, oxidation and corrosion properties of an Fe-40 at.% Al (FeAl) alloy. Initial work determined that additions of more than 0.5 at.% precious metal did not improve the oxidation and corrosion properties of the materials and in some cases even decreased the resistance to corrosion. Further work identified Pt and Ru as beneficial additions to the FeAl alloy. Four alloys were then produced by mechanical alloying and sintering (FeAl-0.2 at.% Pd, FeAl-0.2 at.% Ru, FeAl-0.5 at.% Ag, FeAl-0.5 at.% Pt). These alloys were all successfully produced by melting and casting and mechanical alloying sintering and it was found that the nonequilibrium processing greatly decreased the grain size of the materials compared to the ascast materials. It was found that the additions of Ru and Pt were still the most beneficial to the oxidation and corrosion properties, with Ru being considered the most beneficial.This report details the results from the initial spray testing work done with the FeAl-0.2 at.% Ru alloy powder produced by mechanical alloying. There are several options for powder coating onto substrates; thermalspray techniques, which include high-velocity oxy-fuel (HVOF) coating and plasma coating, or cold-spray (also known as supersonicspray) techniques. Cold-spray techniques have attracted a lot of interest lately and as a system is available at University of the Witwatersrand, it was decided to use cold spraying in the current work. This work was done to determine the effectiveness of cold-spray coating of these mechanically alloyed powders.The iron-aluminium system has attracted a large amount of research due to the fact that Fe-Al intermetallic compounds possess good mechanical properties, along with low density and low cost, as well as easy access to the raw materials (Ji et al., 2006;Montealegre et al., 2000). Arzhnikov et al. (2008) found that the Fe-Al alloys are promising, due to their good refractoriness, oxidation and corrosion resistance and good ductility at room temperature. In comparison to conventional alloys, Fe-Al alloys perform much better at higher temperatures, due to the stability of the Cold-spray coating of an Fe-40 at.% Al alloy with additions of ruthenium by R.A. Couperthwaite*, L.A. Cornish † ‡ and I.A. Mwamba* In previous work by the authors, it was established that additions of 0.2 at.% Ru to an Fe-40 at.% Al alloy improved the corrosion and oxidation resistance of the alloy. The alloy was produced by mechanical alloying and spark plasma sintering and the work showed that nonequilibrium processing was able to significantly refine the grain size of the material. The sintered material had a higher hardness than the as-cast material and the change in grain size did not significantly affect the oxidation and corrosion. In the present research, the mechanically alloyed powder was coated onto a mild steel substrate using cold-spray coating at ...

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“…Although FeAl is ductile at high temperature, it becomes brittle below 800°C 36. Kuc et al37 also reported that FeAl cracks when it is deformed at temperatures below 800°C at a strain rate of 0.5 s −1 . In contrast, the Fe 3 Al phase is ductile in a wide temperature range 36.…”

Section: Aluminized Coatingmentioning

confidence: 99%

State‐of‐the‐Knowledge on Coating Systems for Hot Stamped Parts

Fan

Cooman

2012

steel research int.

174

140

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In the present contribution, recent developments of coatings for hot stamped steels are reviewed. The use of bare steel in the initial hot stamping technology is discussed, including the application of lubricant oils which are used as oxidation inhibitors on bare steel surfaces. The aluminized coatings are introduced, focusing on the microstructure evolution of aluminized coatings during the hot stamping process. An analysis of the cracking of the coating, caused by the formation of brittle Fe-Al intermetallic phases and their high temperature deformation, is presented. The development of a ductile aluminide coating formed during the diffusion treatment of an aluminized coating is discussed. This aluminide coating can endure both high temperature oxidation and severe plastic deformation. The recently developed galvanized and galvannealed coatings are also reviewed and the influence of the gas atmosphere during the heating cycle on the coating stability is emphasized. The solutions which have been proposed to avoid liquid Zninduced embrittlement are analyzed. The use of Zn-Ni alloy coating, which is characterized by a higher melting temperature, is reviewed. The behavior of sol-gel hybrid coatings on hot stamped steels is discussed. The possible use of the recently developed Al-Zn alloy coatings, dual layer Zn-Al and Zn-Al-Mg coatings is also introduced. The application of Zn-Al-Mg post-process galvanizing is also discussed. In each case, all available information related to the weldability, paintability, and corrosion resistance of the coating systems is also reported. Finally, the advantages and technical challenges associated with each type of coating are reviewed.[ Ã ] Dr.

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Structure and plasticity in hot deformed FeAl intermetallic phase base alloy

Cited by 11 publications

References 5 publications

The effect of Cu addition on the hot deformation behavior of NiTi shape memory alloys

The effect of Cu addition on the hot deformation behavior of NiTi shape memory alloys

Cold-spray coating of an Fe-40 at.% Al alloy with additions of ruthenium

State‐of‐the‐Knowledge on Coating Systems for Hot Stamped Parts

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