Abstract
Effect of Ca addition on the microstructures of Mg-15Gd-0.5Zr (wt%) alloy during isothermal ageing at 250 °C have been investigated using high-angle annular dark-field scanning transmission electron microscopy and X-ray mapping. The results show that precipitation in the Ca-containing alloy involves the formation of ordered solute clusters, G.P. zones, β′, β1, β, Mg2Ca, and a novel ternary phase containing Mg, Gd and Ca. The novel precipitate phase has a plate morphology with its habit plane parallel to the basal plane of the matrix. It has a hexagonal structure (with lattice parameters a = 0.59 nm and c = 1.01 nm) and an orientation relationship with the matrix phase: (0001)P//(0001)α, 1¯21¯0P//011¯0α. Ca segregation inside β1 and β phases is observed and interpreted based on density functional theory calculations.
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