of the original manuscript: Laser, T.; Nuernberg, M.; Janz, A.; Hartig, C.; Letzig, D.; Schmid-Fetzer, R.; Bormann, R.: a ,
AbstractCalculated phase diagrams for the Mg-Al-Zn-Mn system indicate that β-Mn(Al) and Al8Mn5 can primarily crystallize during the solidification of Mn modified AZ31. Both phases may act as potential heterogeneous nucleants for magnesium grains and thus as potential grain refiners in the Mg-Al system. In this investigation three Mg-3Al-1Zn alloys with different Mn content are diecast and hot-rolled at 450°C. The influence of the Mn content on the microstructural evolution and mechanical properties after hot-rolling is studied.After casting, β-Mn and Al8Mn5 are present in all three AZ31 alloys without showing significant influence on the grain size. The potential of β-Mn and Al8Mn5 precipitates for grain-refinement in AZ alloys is discussed in detail on the basis of solidification kinetics.
A procedure is suggested to identify key sample compositions in n-component alloys, providing the most crucial information with limited experimental effort. The proposed algorithm furthermore establishes the exact type of reaction equation of the (n + 1) phase invariant equilibria. Predictive calculations of phase equilibria in quaternary Mg-Al-Ca-Sr and quinary Mg-Al-CaSr-Mn alloys are performed based on elaborate binary and ternary thermodynamic descriptions. Experimental work, using key samples and Mg-rich alloys, demonstrates the viability of the current approach in validating the predictions. Finally, the impact of using more or less elaborate ternary data is quantitatively exemplified for the quinary system Mg-Al-Ca-Sr-Mn by a comparison of different thermodynamic data sets.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.