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Role of Thermal Vacancies on Temperature Dependence of Lattice Parameter and Elastic Moduli in B2-type FeAl

Published online by Cambridge University Press:  28 December 2012

Mi Zhao ,
Kyosuke Yoshimi ,
Kouichi Maruyama  and
Kunio Yubuta
Mi Zhao
Affiliation:
Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.
Kyosuke Yoshimi
Affiliation:
Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.
Kouichi Maruyama
Affiliation:
Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan.
Kunio Yubuta
Affiliation:
Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan.
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Abstract

Temperature dependence of the lattice parameter and elastic moduli in Fe-40 and -43Al (at.%) was investigated by high temperature X-ray diffractometry (XRD) and the Electro-Magnetic Acoustic Resonance (EMAR) method. The thermal vacancy concentration was estimated from the activation enthalpy and entropy data of vacancy formation previously reported for FeAl. It was found that both the lattice parameter and the elastic moduli of FeAl have a linear relationship with temperature even in the temperature range where thermal vacancy concentration rapidly increases (above 400 °C), thus suggesting that newly generated thermal vacancies at elevated temperature do not make significant influence on the lattice parameter and the elastic properties of B2-type FeAl.

Keywords

defectsx-ray diffraction (XRD)elastic properties
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 169 - 175
Copyright
Copyright © Materials Research Society 2012 

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References

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