Oxidation and ignition behavior of a magnesium alloy containing rare earth elements
Source: The International Journal of Advanced Manufacturing Technology, Volume 51, Numbers 1-4, November 2010 , pp. 225-231(7)
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.
Document Type: Research article
Affiliations: 1: College of Material Science and Engineering, Chongqing University, Chongqing, 400044, People's Republic of China, Email: firstname.lastname@example.org 2: College of Material Science and Engineering, Chongqing University, Chongqing, 400044, People's Republic of China
Publication date: 2010-11-01