Effect of boron on the vacancy hardening of FeAl

Journal Article · Tue Apr 15 04:00:00 EDT 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(96)00497-6· OSTI ID:477132

Deevi, S C; Sikka, V K ^[1]; Inkson, B J; Cahn, R W ^[2]

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1. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.
2. Univ. of Cambridge (United Kingdom). Dept. of Materials Science and Engineering

Iron aluminides based on FeAl possess attractive high-temperature properties such as low density, excellent oxidation and sulfidation resistances, and good tensile and creep strengths up to 700 C. Interestingly, the extended phase field of FeAl gives rise to nonstoichiometric iron aluminides, and the deficiency of atomic species lends to the generation of constitutional vacancies in non stoichiometric aluminides. It has been shown that thermal vacancies harden the aluminides and quenched-in vacancies in binary FeAl can only be relieved by annealing at 400 C for 120 h (5 d). The concentration of vacancies is shown to increase with the increase of aluminum content. Kong and Munroe noted that ternary alloying of FeAl can reduce the hardening due to vacancies; this effect is dependent on the substitutional element and its atomic composition. Several researchers investigated the effect of boron on the room-temperature mechanical properties of FeAl. This paper investigates the effect of boron on vacancies in FeAl.

• OSTI ID: 477132
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 36; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BORON
GRAIN BOUNDARIES
INTERMETALLIC COMPOUNDS
IRON ALLOYS
METALLURGICAL EFFECTS
SURFACE HARDENING
VACANCIES