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2567 |
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Annealing effect on the intermetallic compound formation of cold sprayed Fe/Al composite coating |
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Hongtao Wang / Jiangxi Engineering Research Center for Materials Surface Remanufacturing
School of Mechanical and Materials Engineering
Jiujiang University, Jiujiang, Jiangxi, P.R.China Chang-Jiu Li / State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, P.R. China Gang-Chang Ji/ JiuJiang Key Laboratory for Green Remanufacturing, Jiujiang University, P.R. China Guan-Jun Yang/ State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, P.R. China |
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In this paper, an iron/aluminum composite coating was prepared by cold spraying using iron and aluminum powder mixtures and then converted to iron aluminudes with suitable annealing treatment. Such annealing-treated coating has been characterized using differerntial scanning calorimetry to trace the kinetics of the phase transformation, X-ray diffraction to determine the phases present and scanning electron microscopy with microprobe analysis to observe the microstructure and measure the chemical composition. It was found that the intermetallic compound layers such as Al5Fe2 were observed at the interfaces between the Fe particles and Al particles in the coating after annealing at 450-550oC in argon atmospheres for 4 hours. Also, the intermetallic layer formaiton of Al5Fe2 at the interfaces depended on the solid-state diffusion and the annealing temperature. The Fe particles in the Al matrix were fully consumed via compounding reaction with Al at the annealing temperature of 550oC. The intermetallic compound AlFe was obtained by low-temperature annealing under the metling temperature. While the porosity in the as-sprayed precursor deposits was about zero, some prorosity developed because of Kirkendall effect during annealing treatment at high temperature and the sources for this were discussed. |