Age hardening in some Fe–Al–Nb alloys

Morris, David G.; Requejo, L. M.; Muñoz-Morris, Ma Antonia

doi:10.1016/j.scriptamat.2005.10.022

Cited by 31 publications

(7 citation statements)

References 10 publications

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“…Unfortunately, the crystallographic structure of this third phase could not be identified from the XRD spectrum because the volume fraction of the phase was too small. The observed composition of this phase renders it unlikely that it is the L2 1 -ordered Heusler phase which has been reported to occur in Fe-Al-Nb alloys [15][16][17]26,27]. Though of appropriate composition, in none of the alloys the L2 1 Heusler phase was observed.…”

Section: Isothermal Sectionsmentioning

confidence: 79%

Phase equilibria in the Fe corner of the Fe–Al–Nb system between 800 and 1150°C

Palm

2009

Journal of Alloys and Compounds

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Section: Isothermal Sectionsmentioning

confidence: 79%

Phase equilibria in the Fe corner of the Fe–Al–Nb system between 800 and 1150°C

Palm

2009

Journal of Alloys and Compounds

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“…6 By generating such microstructures, Fe-Albased alloys may be considerably strengthened at high temperatures, but only few relevant investigations have been performed. 2,6,7,29,33,34 The aim of this study was to investigate the possibility of producing coherent microstructures in the Fe-Al-Ti system and to examine the resulting mechanical properties and the oxidation behavior of these alloys. For this purpose, two alloys with compositions situated inside the two-phase field A2 + L2 1 have been thoroughly investigated.…”

Section: Introductionmentioning

confidence: 99%

Characterization of microstructures, mechanical properties, and oxidation behavior of coherent A2 + L2₁Fe-Al-Ti

2009

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Two Fe-Al-Ti alloys with coherent aFe,Al (A2) + Fe 2 AlTi (L2 1 ) microstructures have been produced and the evolution of the microstructure with aging time has been studied by light optical and scanning electron microscopy and hardness measurements. The compressive flow strength, creep properties, brittle-to-ductile-transition temperatures (BDTT), and oxidation behavior of the alloys have been evaluated. The results show that the investigated alloys show good flow strength, high creep resistance, and good oxidation resistance. However, their BDDT is high compared to binary Fe-Al-based alloys and compared to other Fe-Al-Ti alloys no increase in creep resistance was achieved by generating coherent microstructures. The latter effect is due to the breakup of the coherent microstructures when the temperature varies because the compositions and consequently the volume fractions of the phases vary markedly depending on temperature.

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“…A second topic of interest is to consider the difference in behaviour of the present alloy and a previous Fe-Al alloy with Laves-forming solute additions [22][23][24]. Fe-Al alloys with Al content of the order of 20-30% and small amounts of Nb in solid solution are strengthened at high temperatures by the formation of precipitates of the L2 1 cubic Fe 2 NbAl transition phase, which subsequently transforms to the stable hexagonal C14 Fe 2 Nb Laves phase.…”

Section: Discussionmentioning

confidence: 99%

Strengthening at High Temperatures in an Iron-Aluminium Alloy by the Precipitation of Stable and Coherent Intermetallic Particles

Morris¹,

Muñoz-Morris²,

Requejo³

2006

MRS Proc.

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Despite decades of intensive research iron aluminides remain characterised by relatively poor ductility at room temperature and low strength at high temperatures, especially under slow strain rate or creep conditions. A variety of strengthening particles has been tested for improving high temperature strength, but each has serious limitations: typical carbide precipitates are unable to resist dissolution or coarsening at high temperatures; as-solidified iron aluminides with sufficient amounts of transition elements such as Nb or Mo show heavy solidification segregation and are embrittled by a network of Laves phase; mechanical milling with stable oxides appears an excessively expensive processing route. A new iron-aluminium alloy has been developed with Zr and Cr additions that forms fine coherent precipitates even after extended annealing at temperatures as high as 900ºC. These precipitates have a complex Fe 3 Zr structure and form in a cube-on-cube orientation relationship in the bcc matrix. The low solubility and diffusivity of the solute, as well as the low energy, near-coherent interface ensures excellent stability of these intermetallic precipitates. Interesting strengthening is possible for this material under the relevant high temperature creep conditions.

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Age hardening in some Fe–Al–Nb alloys

Cited by 31 publications

References 10 publications

Phase equilibria in the Fe corner of the Fe–Al–Nb system between 800 and 1150°C

Phase equilibria in the Fe corner of the Fe–Al–Nb system between 800 and 1150°C

Characterization of microstructures, mechanical properties, and oxidation behavior of coherent A2 + L2₁Fe-Al-Ti

Strengthening at High Temperatures in an Iron-Aluminium Alloy by the Precipitation of Stable and Coherent Intermetallic Particles

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Age hardening in some Fe–Al–Nb alloys

Cited by 31 publications

References 10 publications

Phase equilibria in the Fe corner of the Fe–Al–Nb system between 800 and 1150°C

Phase equilibria in the Fe corner of the Fe–Al–Nb system between 800 and 1150°C

Characterization of microstructures, mechanical properties, and oxidation behavior of coherent A2 + L21Fe-Al-Ti

Strengthening at High Temperatures in an Iron-Aluminium Alloy by the Precipitation of Stable and Coherent Intermetallic Particles

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Characterization of microstructures, mechanical properties, and oxidation behavior of coherent A2 + L2₁Fe-Al-Ti