Strain rate sensitivity of ductility in a Fe-28Al alloy under tensile impact

Journal Article · Wed Oct 15 04:00:00 EDT 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(97)00219-4· OSTI ID:540909

Chen, M; Lin, D ^[1]; Xia, Y ^[2]; Liu, C T ^[3]

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1. Shanghai Jiao Tong Univ. (China). Dept. of Materials Science and Engineering
2. Univ. of Science and Technology, Beijing (China). Dept. of Modern Mechanics
3. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

Ductility of iron aluminides at room temperature is very sensitive to moisture in test environment. The mechanism is thought to involve the reaction of moisture in air with aluminum atoms in the alloys, resulting in the generation of atomic hydrogen, which then enters the metal and embrittles the crack tip region. A characteristic of most environment-sensitive fracture is strain rate sensitivity and low strain rates exacerbate embrittlement, as would be expected for any diffusion-controlled processes. Previous studies have observed the effects of strain rate on ductility of Fe{sub 3}Al, in which the elongation of specimens increases with strain rate ranging from 10{sup {minus}5} to 10{sup {minus}1}/s. However, whether the effects of strain rate on ductility exist at high strain rate is unknown to date. The present work expands the study of the effects of strain rate on ductility of Fe{sub 3}Al and also includes the influence of test environment on the ductility under tensile impact.

• OSTI ID: 540909
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 37; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
DUCTILITY
ENVIRONMENT
IMPACT TESTS
INTERMETALLIC COMPOUNDS
IRON ALLOYS
STRAIN RATE