Mechanical properties of Ni{sub 3}Al and FeAl: Recent developments

Conference · Fri Aug 01 04:00:00 EDT 1997

OSTI ID:521616

George, E P; Liu, C T ^[1]

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1. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

Recent developments in the understanding of the ductility and fracture behavior of Ni{sub 3}Al and FeAl are reviewed. Both intrinsic factors (e.g., alloy stoichiometry), and extrinsic factors (e.g., environment) have been shown to affect their mechanical properties. Of all the recent developments, perhaps the most significant is the realization that Ni{sub 3}Al and FeAl are intrinsically ductile (at least on the Al-deficient side of stoichiometry); their brittleness when tested in ambient air is due mainly to environmental embrittlement. Another intriguing discovery is that boron embrittles Ni{sub 3}Al in gaseous hydrogen (until recently, B was though to have only beneficial, or at most neutral, effects). The authors review these and other recent discoveries and discuss, wherever possible, the underlying physical mechanisms giving rise to the observed mechanical behavior.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC05-96OR22464
• OSTI ID: 521616
• Report Number(s): CONF-970909--3; ON: DE97007764
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BORON
DUCTILITY
EMBRITTLEMENT
FRACTURE PROPERTIES
INTERMETALLIC COMPOUNDS
IRON ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
NICKEL BASE ALLOYS
TEMPERATURE DEPENDENCE