Observation of the suppression of Mg17Al12 formation in a La-containing AZ91 alloy
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AZ91 magnesium alloy has been widely used in automobile and aerospace industries owing to its good castability, mechanical and excellent corrosion properties among the other Mg-based alloys. However, the application of this alloy is restricted to temperatures below 120 °C because of the reduction in strength and creep properties due to poor thermal instability of the microstructure [1, 2]. Therefore, improving the elevated temperature properties of AZ91 has become a major issue for possible applications of this alloy in power train components in the automobile industry. Recently, it has been reported that the addition of rare earth elements such as mischmetal, Ce, La, etc., in AZ91 alloy yielded an improvement in high temperature properties. This is due to suppression of the formation of the β-Mg17Al12 phase and the introduction of new thermally stable intermetallics along the grain boundaries, which restrict grain boundary sliding [3, 4]. However, there is no systematic study on the...
KeywordsEnergy Dispersive Spectrometer AZ91 Alloy Mischmetal Phase Suppression Phase Dissolution
The authors thank the CSIR and DST—New Delhi, Govt. of India for their financial support. The authors wish to acknowledge the help received from Dr. P. Prabakar Rao for SEM and Mr. P. Guruswamy for XRD analyses.
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