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Effect of Al on the Wetting Behavior Between TiC x and Molten Ti-Al Alloys

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Abstract

The wetting behavior and the interfacial reactions between TiC x substrate and molten Ti-Al alloys with different Al contents were studied using the Sessile Drop method at 1758 K (1485 °C) in argon atmosphere. It is found that the wettability and interface reaction products depend on Al content in the molten alloy. The initial contact angles between the molten Ti-Al alloy and TiC0.78 surface reduces from 110 to 80 deg when Al content in the alloy changes from 40 to 80 wt pct. The reduction in the initial contact angle is due to the decrease of surface tension of the molten Ti-Al alloys with increasing Al contents. The segregation of Al atoms to the surface occurred at all bulk concentrations of Ti-Al alloys. Al with lower surface tension tends to segregate on the surface of liquid Ti-Al alloy. In the spreading stage, the interfacial reaction led to the decrease in the contact angle. The adhesion in Ti-Al/TiC x system can be interpreted in terms of strong chemical interactions, which is greatly affected by the diffusion of C. The equilibrium contact angle was measured less than 10 deg. Finally, the reaction sequence at the Ti-Al melt and TiC x substrate interface is proposed.

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Acknowledgments

The authors are especially grateful to the National Program on Key Basic Research Project (973 Program) (Project No. 2013CB632603) and Chongqing University Postgraduates’ Innovation Fund (Project No. CDJXS12131105).

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Authors and Affiliations

  1. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, P.R. China

    Xuyang Liu (Ph.D. Student), Xuewei Lv (Professor of Materials Engineering), Chunxin Li (Master Student) & Chenguang Bai (Professor of Materials Engineering)

  2. Department of Engineering, University of Leicester, Leicester, LE1 7RH, U.K.

    Xuyang Liu (Ph.D. Student) & Hongbiao Dong (Professor of Materials Engineering)

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  1. Xuyang Liu
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  2. Xuewei Lv
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  3. Hongbiao Dong
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  4. Chunxin Li
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Correspondence to Xuewei Lv.

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Manuscript submitted March 17, 2014.

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Liu, X., Lv, X., Dong, H. et al. Effect of Al on the Wetting Behavior Between TiC x and Molten Ti-Al Alloys. Metall Mater Trans A 46, 4783–4792 (2015). https://doi.org/10.1007/s11661-015-3058-2

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