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

Published online by Cambridge University Press:  26 February 2011

David G. Morris ,
Maria A. Muñoz-Morris  and
Luis M. Requejo
David G. Morris
Affiliation:
[email protected], CENIM, CSIC, Physical Metallurgy, Avenida Gregorio del Amo 8, Madrid, N/A, Spain, 34-91-553-8900, 34-91-534-7425
Maria A. Muñoz-Morris
Affiliation:
[email protected], CENIM, CSIC, Physical Metallurgy, Avenida Gregorio del Amo 8, Madrid, E-28040, Spain
Luis M. Requejo
Affiliation:
[email protected], CENIM, CSIC, Physical Metallurgy, Avenida Gregorio del Amo 8, Madrid, E-28040, Spain
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Abstract

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 Fe3Zr 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.

Keywords

microstructurealloystrength
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II01-04
Copyright
Copyright © Materials Research Society 2007

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References

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