Heat Resistance of Mg-Nd Based Casting Alloys Containing Gadolinium and Yttrium
Influences of Gd or Y addition on microstructures and tensile properties at room and elevated temperatures were investigated for T6-treated Mg-3%Nd-0.5%Zn-0.4%Zr casting alloys, on the basis of experimental results from X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, tensile and creep tests. Microstructures of the T6-treated alloys are characterized by recrystallized α-(Mg) grains containing various nano-sized precipitates such as Mg41Nd5, Zn2Zr3 and Zr particles. In T6 condition, most of added Gd and Y elements are dissolved in Mg41Nd5 precipitates rather than formation of new phases. Tensile properties and creep resistance of the Mg-3%Nd-0.5%Zn-0.4%Zr alloy are remarkably increased by the addition of Gd or Y, but their efficiencies are substantially the same.
Young Won Chang, Nack J. Kim and Chong Soo Lee
J. H. Jun et al., "Heat Resistance of Mg-Nd Based Casting Alloys Containing Gadolinium and Yttrium", Advanced Materials Research, Vols. 26-28, pp. 137-140, 2007