Interdiffusion in B2 type intermetallic compound FeAl under high pressures

Ryusuke Nakamura; Yoshihiro Yamazaki; Yoshiaki Iijima

doi:10.2320/matertrans.44.78

Interdiffusion in B2 type intermetallic compound FeAl under high pressures

Ryusuke Nakamura, Yoshihiro Yamazaki, Yoshiaki Iijima

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Interdiffusion coefficient in the B2 FeAl phase at 46-50 at%Al has been measured in the temperature range from 1173 to 1473 K under the pressure from 0.1 MPa to 5 GPa. The activation volume for interdiffusion, ΔV̄, derived from the pressure dependence of interdiffusion coefficient is found to be 0.58-0.90V_m (V_m: molar volume of alloys), which is comparable to or larger than 0.4-0.6V_m for the monovacancy mechanism in bcc pure metals or random alloys. The value of ΔV̄ increases with increasing temperature and also with deviating from stoichiometry, suggesting that divacancy contributes to the diffusion in higher temperatures and in the region of off-stoichiometry.

Original language	English
Pages (from-to)	78-82
Number of pages	5
Journal	Materials Transactions
Volume	44
Issue number	1
DOIs	https://doi.org/10.2320/matertrans.44.78
Publication status	Published - Jan 1 2003
Externally published	Yes

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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abstract = "Interdiffusion coefficient in the B2 FeAl phase at 46-50 at%Al has been measured in the temperature range from 1173 to 1473 K under the pressure from 0.1 MPa to 5 GPa. The activation volume for interdiffusion, Δ{\=V}, derived from the pressure dependence of interdiffusion coefficient is found to be 0.58-0.90Vm (Vm: molar volume of alloys), which is comparable to or larger than 0.4-0.6Vm for the monovacancy mechanism in bcc pure metals or random alloys. The value of Δ{\=V} increases with increasing temperature and also with deviating from stoichiometry, suggesting that divacancy contributes to the diffusion in higher temperatures and in the region of off-stoichiometry.",

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AU - Nakamura, Ryusuke

AU - Yamazaki, Yoshihiro

AU - Iijima, Yoshiaki

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Y1 - 2003/1/1

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AB - Interdiffusion coefficient in the B2 FeAl phase at 46-50 at%Al has been measured in the temperature range from 1173 to 1473 K under the pressure from 0.1 MPa to 5 GPa. The activation volume for interdiffusion, ΔV̄, derived from the pressure dependence of interdiffusion coefficient is found to be 0.58-0.90Vm (Vm: molar volume of alloys), which is comparable to or larger than 0.4-0.6Vm for the monovacancy mechanism in bcc pure metals or random alloys. The value of ΔV̄ increases with increasing temperature and also with deviating from stoichiometry, suggesting that divacancy contributes to the diffusion in higher temperatures and in the region of off-stoichiometry.

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Interdiffusion in B2 type intermetallic compound FeAl under high pressures

Abstract

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