Hydrogen diffusivity in iron aluminides determined by subscale microhardness profiling

Journal Article · Mon Oct 05 04:00:00 EDT 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(98)00307-8· OSTI ID:665170

Banerjee, P; Balasubramaniam, R ^[1]

---

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

It has been well established that the poor ductility of iron aluminides at ambient temperatures is due to hydrogen embrittlement. Hydrogen is produced by the reaction of moisture with the iron aluminide and enters the lattice to cause embrittlement. Therefore, one of the important factors that needs to be understood is the diffusion of hydrogen in iron aluminides. There are relatively few studies that have determined the diffusivity of hydrogen in iron aluminides. The apparent hydrogen diffusion coefficient can be easily measured by the technique of subsurface microhardness profiling after cathodic hydrogen charging. This technique has been utilized to determine room temperature hydrogen diffusivity in Al-Li alloys and several austenitic stainless steels. A similar technique was also used to determine high temperature oxygen and nitrogen diffusivities in titanium aluminides. The aim of the present paper is to determine the diffusivity of hydrogen, in stoichiometric Fe{sub 3}Al and iron aluminides alloyed with Cr nd Ti, by this technique.

• OSTI ID: 665170
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 9 Vol. 39; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ATOM TRANSPORT
CHROMIUM ALLOYS
CONCENTRATION RATIO
DIFFUSION
HYDROGEN
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MICROHARDNESS
TITANIUM ALLOYS