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Kinetics of intermetallic compound layers during initial period of reaction between mild steel and molten aluminum

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      Abstract

      Hot dip aluminizing of mild steel at different temperatures was conducted to reveal the influence of reaction temperature and time on interfacial intermetallic compounds (IMCs). Scanning electron microscopy, energy dispersive X-ray spectrometry and X-ray diffraction were employed to investigate the interfacial microstructures. The IMCs of the dipping interface consisted of a thick layer of η-Fe 2Al 5 between 4.2–132.2 μm next to the steel and a thin layer of θ-Fe 4Al 13 between 0–5.5 μm close to the aluminum. With increasing dipping temperature and time, the total thickness of IMCs (Fe 2Al 5 plus Fe 4Al 13) increased. Specifically, the growth of the Fe 2Al 5 layer can be described by parabolic rate laws. An activation energy of 93 kJ mol −1 was obtained, combining both the results from the present work and previous studies in the temperature range of 675–900°C. The change in Fe 4Al 13 thickness is not significant compared with the Fe 2Al 5. However, the decrease in IMC thickness of the Fe 4Al 13 with dipping temperature was observed for the first time and had never been reported before. Moreover, it can be clearly observed that the thickness of the Fe 4Al 13 decreased with dipping time based on the linear fitting results by excluding the result of the initial 1 s. A possible mechanism is that interfacial dynamics and thermodynamics work for the dissolution and decomposition of the Fe 4Al 13 layer. Higher temperature accelerates the dissolution of the θ layer.

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      Molecular modeling investigation of adsorption of self-assembled peptide nanotube of cyclo-[(1R,3S)-γ-Acc-d-Phe]3 in CHCl3

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        Author and article information

        Affiliations
        a Department of Mechanical Engineering, Shandong Jiaotong University, Jinan, P.R. China
        b Institute of Materials Joining, Shandong University, Jinan, P.R. China
        c Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Canada
        Author notes
        [] Correspondence address, Dr. Huan He, Department of Mechanical Engineering, Shandong Jiaotong University, 5001 Haitang Road, Changqing District, Jinan, 250357, P.R. China, Tel: +86-531-80687523, Fax: +86-531-80687523, e-mail: welderhehuan@ 123456yahoo.com
        Journal
        ijmr
        International Journal of Materials Research
        Carl Hanser Verlag
        1862-5282
        2195-8556
        13 March 2019
        : 110
        : 3
        : 194-201
        MK111735 10.3139/146.111735
        © 2019, Carl Hanser Verlag, München
        Counts
        References: 31, Pages: 8
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