Fatigue behavior of Fe-48 at.% Al polycrystals with B2 structure at high temperatures

Journal Article · Fri Dec 18 04:00:00 EST 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(98)00426-6· OSTI ID:328257

Yasuda, H Y; Behgozin, A; Umakoshi, Y ^[1]

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1. Osaka Univ., Suita, Osaka (Japan). Dept. of Materials Science and Engineering

In FeAl alloys with the B2 structure, slip transition from <111> at low temperature to <001> at high temperature occurs depending on crystal orientation, alloying composition and lattice defects such as excess thermal vacancies. The slip transition strongly influences the strength, ductility and fracture mode in these alloys. According to recent results using FeAl single crystals containing a low density of excess thermal vacancies, yield stress increased with increasing temperature showing an anomalous peak between 823 and 873K. The anomalous strengthening peak corresponded to the slip transition: <111> superlattice dislocations were dominantly operative at temperatures below the peak, while <001> dislocations appeared above the peak. In this article, the authors report on the fatigue behavior of an Fe-48at.%Al polycrystalline alloy deformed at high temperatures, focusing on the effect of anomalous strengthening and the transition in slip direction.

• OSTI ID: 328257
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 2 Vol. 40; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
FATIGUE
FREQUENCY DEPENDENCE
INTERMETALLIC COMPOUNDS
IRON ALLOYS
POLYCRYSTALS
SAMPLE PREPARATION
SLIP
STRESSES
TEMPERATURE RANGE 0400-1000 K