Effect of Annealing Treatment on the Isothermal and Cyclic Oxidation Behavior of an Electrodeposited Alumina-Forming Ni-Al Microcomposite

Abstract:

In this study, an electrodeposited alumina-forming Ni-Al composite having a nanocrystalline Ni matrix dispersing Al microparticles was produced and annealed in vacuum at 500°C for different time (3hr, 5hr and 8hr, respectively). Effect of annealing time on the microstructure, isothermal and cyclic oxidation behavior of the Ni-Al composite at 1000°C was comparably investigated. The results indicated that Al microparticles slowly dissolved into nickel grain to form an ultrafine-grained Ni₃Al/NiAl composite with micro-sized pores dispersion due to volume shrinkage. The increased distribution uniformity of Al with the increasing of annealing time favors the formation of a protective alumina layer in a short time, and then significantly reduced the isothermal oxidation rate. Besides, the reduction of pores size with the increasing of annealing time also helps the ultrafine-grained Ni₃Al/NiAl composite to grow an adherent alumina scale with increased cyclic oxidation resistance.

• Periodical: Advanced Materials Research (Volumes 1033-1034)
• Pages: 1275-1282
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1033-1034.1275
• Online since: October 2014
• Authors: Yong Dong Wang*, Bai Ru Li, Xing Liu
• Keywords: Cyclic Oxidation, Electrodeposited, Isothermal Oxidation

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