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Annealing Effect on the Intermetallic Compound Formation of Cold Sprayed Fe/Al Composite Coating

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Abstract

A Fe/Al composite coating was prepared by cold spraying using an iron-aluminium powder mixture with a Fe/Al atomic ratio of 1:1. The effect of annealing temperature on the intermetallic compound formation in the cold-sprayed Fe/Al coating was investigated. The as-sprayed and annealed coatings were characterized by x-ray diffraction (XRD), and scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy. Results showed that intensive particle deformation on impact promoted the Fe2Al5 intermetallic compound formation at a low annealing temperature of 450 °C and this intermetallic layer firstly appeared along some intimate contact regions at the aluminium-iron boundaries. The amount of the Fe2Al5 intermetallic compound increased and no other intermetallic compound phases appeared when the annealing temperature was raised from 450 to 600 °C. Some cracks developed in the Fe2Al5 intermetallic layer when the coating was annealed at 600 °C and the possible causes leading to evolution of cracks are discussed.

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Acknowledgments

The present work is supported by the National Natural Science Foundation of China (No. 51001056 and 50725101). The author, Hong-Tao Wang, also thanks the support from the Natural Science Foundation of Jiangxi Province (No. 2010GQC0117) and Science and Technology Project of Jiangxi Educational Bureau (No. GJJ11236).

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Authors and Affiliations

  1. Jiujiang Key Laboratory for Green Remanufacturing, School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang, Jiangxi, People’s Republic of China

    Hong-Tao Wang & Gang-Chang Ji

  2. State Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, People’s Republic of China

    Chang-Jiu Li & Guan-Jun Yang

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  1. Hong-Tao Wang
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  2. Chang-Jiu Li
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  3. Gang-Chang Ji
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Correspondence to Hong-Tao Wang.

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Wang, HT., Li, CJ., Ji, GC. et al. Annealing Effect on the Intermetallic Compound Formation of Cold Sprayed Fe/Al Composite Coating. J Therm Spray Tech 21, 571–577 (2012). https://doi.org/10.1007/s11666-011-9722-1

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  • DOI: https://doi.org/10.1007/s11666-011-9722-1

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