Oxidation and ignition behavior of a magnesium alloy containing rare earth elements

Authors: Rao, Jinsong¹; Li, Huaji²

Source: The International Journal of Advanced Manufacturing Technology, Volume 51, Numbers 1-4, November 2010 , pp. 225-231(7)

Publisher: Springer

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Abstract:

The oxidation and ignition behavior of Mg-8 wt.%Al alloy added with rare earth (RE) was investigated. When 0.1 wt.%RE was added, the ignition-proof effect was optimum and the ignition temperature of the alloy increased from 654°C to 823°C. The oxide scales and substrates of the alloy with 0.1 wt.%RE were characterized by scanning electronic microscope, X-ray diffraction, and energy dispersive spectrometer. The results show that a layer of tightly coherent oxidation film formed on the alloy surface under high temperature mainly consists of MgO, RE₂O₃, and Al₂O₃, which is about 2.5-3.5 µm thick. The oxidation kinetics curve of Mg-8 wt.%Al-0.1 wt.%RE follows the parabola rule at 400°C and 700°C and cubic rule at 600°C, which proves that the oxidation at these temperatures is controlled by diffusion obstruction so that the oxidation film can effectively restrain the alloy from further oxidation.

Keywords: Rare earth; Magnesium alloy; Oxidation film; Oxidation kinetics

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s00170-010-2612-8

Affiliations: 1: College of Material Science and Engineering, Chongqing University, Chongqing, 400044, People's Republic of China, Email: rjs@cqu.edu.cn 2: College of Material Science and Engineering, Chongqing University, Chongqing, 400044, People's Republic of China

Publication date: 2010-11-01