Phase Composition and Mechanical Properties of Cerium-and Yttrium-Containing Al-Mg Alloys Subjected to Heat Treatments under Various Conditions

摘要

The phase composition and properties of Al-Mg-Ce and Al-Mg-Y alloys are studied by optical microscopy and mechanical-property measurements. Isothermal sections at 430 and 275 deg C that correspond to alloys having manganese concentrations of up to 16 percent and cerium and yttrium concentrations of up to 0.7 percent are constructed. The ultimate strength, yield strength, and relative elongation of quenched, worked, and aged Al-Mg-based alloys having 7.0-9.9 percent Mg and Ce, Y, Mn, and Zr additions are determined. The alloys are aged at 175, 200, 250, and 300 deg C; the time of aging corresponds to the maximum strengthening effect.