Mechanical behavior of chromium and titanium alloyed with iron aluminides with Mischmetal addition

Journal Article · Tue Mar 03 04:00:00 EST 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(97)00577-0· OSTI ID:619467

Banerjee, P; Balasubramaniam, R ^[1]

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1. Indian Inst. of Tech., Kanpur (India). Dept. of Materials and Metallurgical Engineering

Iron aluminides based on the stoichiometric compositions of Fe{sub 3}Al and FeAl are candidate high temperature materials due to their excellent oxidation and sulfidation resistance. However, they exhibit poor room temperature ductilities due to hydrogen embrittlement (HE). The addition of Cr is very effective in minimizing HE, the cause of which has been elucidated from an electrochemical viewpoint. It has been proposed that alloying Fe{sub 3}Al with passivity-inducing elements would reduce hydrogen liberation rates on the surfaces of iron aluminides thereby minimizing HE. Only the Cr- and Ti-alloyed intermetallics exhibited ductility. The other intermetallics were brittle due to the precipitation of additional brittle phases. In light of these results, three alloyed iron aluminides were prepared keeping the total alloying amount minimum (2%). It has been reported that small Ce additions enhance the ductility of iron aluminides. Therefore, a small amount of Mm (Indian Mischmetal) was also added to these intermetallics as it is known that one of the major components of Mm is Ce. The present communication reports the mechanical behavior of these alloyed iron aluminides.

• OSTI ID: 619467
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 7 Vol. 38; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CERIUM ADDITIONS
CHROMIUM ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
TITANIUM ALLOYS