Effect of Be on Oxidation Behavior and Flame Retardancy of WE43 Mg-alloy at High-temperature
The cast WE43 Mg-alloy with addition of 0.04％Be(WE43-0.04Be)was prepared by elec-tromagnetic stirring melting and casting process,and then subjected to solid solution treatment at 525℃ for 10 h plus aging treatment at 225℃ for 6,10 and 14 h,respectively.Afterwards,the microstructure,me-chanical property,oxidation behavior and flame-retardant property were assessed for the prepared alloys.The results showed that the WE43-0.04Be alloy aged for 10 h possessed the best comprehensive perfor-mance,namely its tensile strength,yield strength and elongation were 253 MPa,209 MPa and 8.3％re-spectively,which could meet the mechanical property requirements for high-speed railway structural parts.The WE43-0.04Be alloy will not bum in air when heated up to 850℃ in a furnace.A mixed oxide scale composed of compounds of Mg and alloying elements was generated on the surface of the alloy,thus inhibiting the inwards migration of aggressive species approching onto the interface oxide scale/WE43-0.04Be alloy.
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