Effect of cerium on ignition point of AZ91D magnesium alloy

The surface and interior temperature-time curves of blocky cerium modified AZ91D magnesium alloy weremeasured during a non-protective heating and melting process. Two inflection points with rapid increase in temperaturewere found on both curves, which corresponded to the formation of "auliflower" oxide on the surface and the occurrenceof flame during melting. These two temperatures are therefore defined as oxidation point and ignition point, respectively.The interior temperature-time curve is similar to that measured on the surface except for a comparable time delay. Theoxidation and ignition temperatures increase with Ce content, an average increase of 33℃ and 61℃ was found whenCe addition was about 1.0 wt %. However, the increasing rate of the oxidation and ignition temperature decreases withincreasing Ce content. An addition of 0.6wt% Ce is recommended for ignition-resistant AZ91 magnesium alloy.

The surface and interior temperature-time curves of blocky cerium modified AZ91D magnesium alloy were measured during a non-protective heating and melting process. Two inflection points with rapid increase in temperature were found on both curves, which corresponded to the formation of ＂aulifiower＂ oxide on the surface and the occurrence of flame during melting. These two temperatures are therefore defined as oxidation point and ignition point, respectively. The interior temperature-time curve is similar to that measured on the surface except for a comparable time delay. The oxidation and ignition temperatures increase with Ce content, an average increase of 33℃ and 61℃ was found when Ce addition was about 1.0 wt %. However, the increasing rate of the oxidation and ignition temperature decreases with increasing Ce content. An addition of 0.6wt% Ce is recommended for ignition-resistant AZ91 magnesium alloy.