Ignition Proof Of Mg-Gd-Y-Zn-Zr Magnesium Alloys

The ignition proof of magnesium alloys has restricted their use in many applications,such as civilian aircraft and other aerospace components.Recent research activities have aimed at increasing the resistance of Mg alloys to oxidation and ignition by modifying the Mg O surface scale to a more protective barrier oxide between the metal and the gas environment.Alloying is one of the techniques to alter the surface oxide structure.In this thesis,Mg-Gd-Y-Zn-Zr magnesium alloys with different alloying elements,namely a rare earth element Yttrium(Y),Gadolinium(Gd)and post-transition metal Zinc(Zn),are studied over a range of different compositions with respect to their effects of heat treatment and effect of extrusion on ignition temperature and oxidation layer of magnesium alloys.Mg-Gd-Y-Zn-Zr A modest arc furnace test sightseen ignition of three Mg alloys with different content(Gd)Gadolinium,(Y)Yttrium,and(Zn)Zinc.6 wt.% Y had the remarkably effective on ignition temperature(901 ?C)up to 30 min which is did not burn,compared with 696℃ for 0 wt.% Y and 768℃ for 1 wt.% Y addition.Experiments to measure the ignition temperature appear to be extremely controlled.However,this appearance is deceiving because the ignition temperature be influenced by on test specifics.Flame tests appear to be able to allow direct study of the behavior in a flame and so seem to be a good seem to study the behavior Mg alloys in an aircraft fire accident.The Flame experiments seem to be able to agree to direct study of the enactment in a flame and so seem to be a good methodology to study the behavior of magnesium alloys in an aircraft fire calamity.Oxidation behavior of the alloys was examined by X-ray diffraction(XRD),scanning electron microscopy(SEM).XRD and SEM investigation shows that dense due effect of Y composition,and compact oxide films composed of Mg O,YO,and Gd O,Zn O,Zr O formed.An Mg-Gd-Y-Zn-Zr magnesium alloy was optimized after the heat treatment with different content of Y Yittrium,Gd Gadolinium,and Zn Zinc,after heat treatment for the high ignition-proof property,which did not burn in air at 936℃ up to 30 min on 6 wt.%Y Yittrium after the heat treatment.Testing to measure the ignition point look as if to be highly well-ordered.However,this presence is deceptive because the ignition temperature be governed by on the investigates method specifics.The Flame experiments seem to be able to agree to direct study of the enactment in a flame and so seem to be a good methodology to study the behavior of magnesium alloys in an aircraft fire calamity.Oxidation behavior of the alloys was examined by X-ray diffraction(XRD),scanning electron microscopy(SEM).XRD and SEM investigation shows that dense due to heat treatment and compact oxide films composed of Mg O,YO,and Gd O,Zn O,Zr O formedA high strength extruded Mg-7Gd-2Y-0.6Zn-0.6Zr magnesium alloy was investigated,before and after heat treatment.As cast Aged Mg-7Gd-2Y-0.6Zn-0.6Zr magnesium alloy had highest ignition temperature(760℃)compared with 748℃ for as cast,742℃ for as solutionaized,622℃ for as Extruded and(633℃)for as Extruded aged.These experiments to measure the ignition points seem to be highly controlled,on the other hand,this presence is deceiving because the ignition temperature be determined by on test details.Flame experiments give the impression to study the performance Mg alloys in an aircraft fire accident.