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Correlative study of the thermoelectric power, electrical resistivity and different precipitates of Al–1.12Mg2Si–0.35Si (mass%) alloy

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Abstract

Characterization of the different precipitates developed in supersaturated Al–1.12Mg2Si–0.35Si (mass%) alloy by thermoelectric power (TEP) and electrical resistivity (ER) measurements was considered. The effect of precipitation of coherent, semi-coherent and non-coherent phases on the TEP was found impressive in describing different precipitates. Upon growing and coherency loss of β′ particles, the TEP increases to reach a maximum value. TEP begins to approach a stable value by the formation of the equilibrium β (Mg2Si) precipitates and then stabilizes with the complete growth of more stable precipitates β phase and Si particles. The first-order coefficient α of the ER–temperature dependence was found dominating in the temperature range 300–635 K. Above this temperature range, the second-order coefficient β starts sharing effectively the resistivity–temperature dependence. Furthermore, it has been shown that the range of temperature in which the first-order coefficient α is dominating slightly increases after slow cooling twice to the room temperature in two successive runs. Correlation of α and β with the lattice rigidity of the alloy under investigation was established. Quenching and slow cooling affect strongly the observed correlation. All measurements in the present investigation were taken under non-isothermal conditions.

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Authors and Affiliations

  1. Physics Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt

    E. F. Abo Zeid, M. A. Gaffar, A. Gaber & M. S. Mostafa

  2. Physics Department, Faculty of Science and Arts, Al Baha University, Al Baha, KSA

    E. F. Abo Zeid

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  1. E. F. Abo Zeid
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  2. M. A. Gaffar
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  3. A. Gaber
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  4. M. S. Mostafa
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Correspondence to E. F. Abo Zeid.

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Abo Zeid, E.F., Gaffar, M.A., Gaber, A. et al. Correlative study of the thermoelectric power, electrical resistivity and different precipitates of Al–1.12Mg2Si–0.35Si (mass%) alloy. J Therm Anal Calorim 122, 1269–1277 (2015). https://doi.org/10.1007/s10973-015-4861-0

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  • DOI: https://doi.org/10.1007/s10973-015-4861-0

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