The Study On Hydrogen And Inclusion In Alumium Melt

The influences of casting parameter and alloying element on the hydrogen content and inclusion in aluminum alloy were studied by Optical microscope, scanning electronic microscope (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction analysis, the relationship between the hydrogen and inclusion was also analyzed. The results show:When the temperature of Al melt increases from680℃to760℃, the density of decompressed sample decreases by0.139g/cm3. When the power of water vapor generating device increases from Ow to1200w, the density decreases by0.389g/cm3, which demonstrates that the increment of environmental humidity significantly increases the tendency of hydrogen absorption. When the melt weight increases from0.2kg to1.0kg, the density increases by0.186g/cm3, which indicates that the effect of melt weight on hydrogen content weakens with increasing melt weight. When the refine time extends from Omin to30min, the density increases by0.113g/cm3.Alloying elements Zn&MRE tend to increase the tendency of hydrogen adsorption in Al melt. When adding5%Zn and0.5%MRE into1050alloy, respectively, the decrement of density is about0.200g/cm3. While adding1%Mg and0.1%Er, respectively, the density increase by0.355g/cm3and0.417g/cm3, respectively. When adding5%Cu and0.5%Ce, the density increase slightly, not coming to0.200g/cm3.The main inclusions are non-metallic inclusion Al2O3and MgO, many of them distribute around gas porosity. As the inclusion content increases, the hydrogen content in Al melt increases. When area volume of inclusion are8.17%and12.61%, the density decreases to2.412g/cm3and2.280g/cm3, respectively. Mg and Er significantly increase the tendency of hydrogen absorption in Al melt, and also increase the area volume of inclusion.