Abstract
Abstract Magnesium (Mg) and its alloys belong to light metals group are now attracting the attention of the manufacturing engineers as promising candidates to develop structures for energy efficient applications. Among the all available Mg alloys, AZ series is the important group of alloys which contains Aluminum (Al) and Zinc (Zn) as the main constituting alloying elements. As the solubility of Al into Mg is limited to ≈ 1 Wt. % at the room temperature, presence of secondary phases is inevitable in AZ series Mg alloys if Al content is more than 1%. In the present study, pure Mg and two AZ series Mg alloys, i) AZ31 which is with 3% Al and ii) AZ91 which is with 9% Al were selected and heat treated (pure Mg and AZ31 at 340 and AZ91 at 410°C) to alter the amount of Al dissolution and to investigate the effect of heat treatment on microstructural modification, microhardness and corrosion behavior. Interestingly, heat treatment severely affected the microstructure of AZ91 Mg alloy as clearly demonstrated by the decreased secondary phase. Hardness was observed as decreased for all the samples due to stress revealing and modified microstructure. From the immersion studies carried out in 3.5% NaCl solution, weight loss measurements showed decreased corrosion rates for all the heat treated samples which can be attributed to the microstructural modification due to heat treatment.
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