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http://dx.doi.org/10.12656/jksht.2012.25.4.190

Effect of Heat Treatment on Microstructure and Tensile Properties of AZ91-CaO Alloy  

Jun, Joong-Hwan (Advanced Fusion Process R&D Group, Korea Institute of Industrial Technology)
Publication Information
Journal of the Korean Society for Heat Treatment / v.25, no.4, 2012 , pp. 190-195 More about this Journal
Abstract
This study aims to investigate and compare the microstructures and room temperature tensile properties for AZ91 and ECO-AZ91 (AZ91+0.3%CaO) alloys in as-cast, T4 and T6 states, respectively. In as-cast state, the ECO-AZ91 alloy has finer microstructure than the AZ91 alloy. The AZ91 alloy exhibits greater ductility, while YS and UTS are inferior to those of the ECO-AZ91 alloy. After T4 treatment, most of ${\beta}$ compounds disappear in the AZ91 alloy, whereas ${\beta}$ phase is still observed in the ECO-AZ91 alloy due to its enhanced thermal stability, resulting in lower values of ductility and UTS. In T6 state, YS and UTS are better in the ECO-AZ91 alloy.
Keywords
AZ91; CaO; Heat treatment; Microstructure; Tensile properties;
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