Influence of humidity on the room temperature tensile properties of Fe[sub 3]Al-based alloys

Journal Article · Tue Nov 01 04:00:00 EST 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90564-9· OSTI ID:7156885

Moret, M; Jongenburger, C P ^[1]; Zhuang, L ^[2]

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1. Shell Research Arnhem (Netherlands)
2. Delft Univ. of Technology (Netherlands)

Iron aluminides are of potential interest in view of their good corrosion resistance at elevated temperatures, especially in atmospheres with high sulfur and low oxygen partial pressures. However, the ductility of these alloys at room temperature is relatively low. Liu et al. reported that Fe[sub 3]Al was quite ductile when tested in a dry oxygen atmosphere and in a vacuum at room temperature. The lowest ductility was obtained when samples were tested in H[sub 2]O vapor. It has been suggested that the embrittlement of Fe[sub 3]Al is due to atomic hydrogen arising from a reaction between water vapor and aluminum atoms at crack tips. The hydrogen atoms diffuse into the metal and concentrate on critical trap sites, such as grain boundaries and dislocations, thereby promoting crack propagation. In this paper, the tensile properties of a binary and alloyed iron aluminide will be reported as a function of the temperature, strain rate and relative humidity of the air. The influence of humidity on fracture surfaces of the aluminides will be shown.

• OSTI ID: 7156885
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 31:9; ISSN SCRMEX; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
DATA
EMBRITTLEMENT
EXPERIMENTAL DATA
HYDROGEN EMBRITTLEMENT
INFORMATION
INTERMETALLIC COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
NUMERICAL DATA
TENSILE PROPERTIES