Effects of Interstitial Boron and Alloy Stoichiometry on Environmental Effects in FeAl

Conference · Wed Apr 22 04:00:00 EDT 1998

OSTI ID:3045

Cohron, J W; George, E P; Zee, R H

Room-temperature tensile tests were conducted on B-doped (300 wppm) and B-free polycrystalline FeAl alloys containing 37, 40, 45, and 48 at. % aluminum in pure hydrogen gas at pressures in the range of 10 sup minus 8 to 10 sup 3 Pa. The ductilities of both B-free and B-doped FeAl decreased with increasing Al content. However, at a given Al level, the ductility of B-doped FeAl was higher than that of its B-free counterpart. Fracture mode was independent of environment and dependent mainly on stoichiometry. Ductility was found to be very sensitive to environment, particularly in the lower Al alloys. Alloys that exhibited >10% ductility in UHV showed a decrease in elongation to fracture with increasing hydrogen pressure. Tests conducted in dry hydrogen gas result in greater ductilities than those conducted in air, indicating that water vapor is more detrimental than H sub 2 to the ductility of FeAl alloys.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
• Sponsoring Organization: USDOE Office of Energy Research (ER)
• DOE Contract Number: AC05-96OR22464
• OSTI ID: 3045
• Report Number(s): ORNL/CP--97786; P98-430; ON: DE00003045
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
ALUMINIUM BASE ALLOYS
BORON
DUCTILITY
HYDROGEN
INTERSTITIALS
LEAD BASE ALLOYS
STOICHIOMETRY
TENSILE PROPERTIES