Annealing Effect on the Intermetallic Compound Formation of Cold Sprayed Fe/Al Composite Coating |
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| Authors: | Hong-Tao Wang Chang-Jiu Li Gang-Chang Ji Guan-Jun Yang |
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| Affiliation: | 1. Jiujiang Key Laboratory for Green Remanufacturing, School of Mechanical and Materials Engineering, Jiujiang University, Jiujiang, Jiangxi, People??s Republic of China
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
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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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