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http://dx.doi.org/10.12656/jksht.2011.24.4.193

Effect of CaO Addition on Age Hardening Behavior of AZ91 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.24, no.4, 2011 , pp. 193-198 More about this Journal
Abstract
Effect of CaO addition on age hardening response has been studied by using optical microscopy, scanning electron microscopy and differential thermal analysis in AZ91 and CaO-containing ECO-AZ91 alloys. After solution treatment, the ${\beta}$($Mg_{17}Al_{12}$) phase formed during solidification mostly disappeared in the microstructure in the AZ91 alloy, whereas numerous ${\beta}$ precipitates containing Ca were still observed in the ECO-AZ91 alloy due to its enhanced thermal stability. The ECO-AZ91 alloy showed the delayed peak aging time and higher peak hardness compared with those of the AZ91 alloy. The activation energies for ${\beta}$ precipitation calculated by means of Kissinger method increased from 71.4 to 85.6 kJ/mole by the addition of CaO, which implies that CaO plays a role in reducing ${\beta}$ precipitation rate in the AZ91 alloy.
Keywords
ECO-AZ91 alloy; ${\beta}$ phase; Age hardening; Precipitation;
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