Solute Content and the Tensile Behavior of High Pressure Die Cast Mg-Al Alloys

Abstract

Binary Mg-Al alloys with varying content of aluminium from 0.5 to 12mass% have been studied. The proof stress increase in two steps whereas the ductility exhibits two correlated stepwise drops, as the aluminium content increases. The first increase in strength, and attendant drop in ductility, is observed between 4 and 5 mass% Al. The second stepwise change is observed between 10 and 12 mass% Al. These effects are connected with well defined changes in the microstructure: at 4 mass% a dispersion of β-phase intermetallic particles appears in the core region and a closed cell structure develops near the surface; at 12 mass% Al, the increased volume fraction of the β- phase intermetallics extends the interconnected network of intermetallics to include the core region as well. The micromechanics of the strengthening and decreased ductility are discussed.

Role of Solute Content on the Intermetallic Structure Development in HPDC Mg-Al Binary Alloys

“…In the current study a detailed microstructural characterization is carried out on a series of hpdc Mg-Al binary alloys to understand the role of solute content on the development of the intermetallic structure. This work builds upon our earlier studies on these alloy systems [6][7][8].…”

Grain Boundary and Intragranular Reactions during Aging in Mg-Al System Alloys Poured into Sand and Iron Molds

“…It is reported that the improvement of 0.2% proof stress and tensile strength by dispersion strengthening by beta Mg 17 Al 12 phase, castability and corrosion resistance. 1,2) Solid solubility of aluminum in magnesium decreases suddenly when temperatures fall below the eutectic point. It is well-known that magnesium alloy containing aluminum more than 6 mass% has remarkable age hardability.…”