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Effect of heat treatment on corrosion behaviors of mg-6gd-3y-0.5zr alloy

China Foundry 2024年第5期21卷 599-612页

作者： Fei Wang Bin-guo Fu yu-feng Wang Tian-shun Dong Guo-lu Li Jin-hai Liu Hebei Key Laboratory of New Functional Materials School of Materials Science and EngineeringHebei University of TechnologyTianjin 300401China Tianjin Institute of Aerospace Mechanical and Electrical Equipment Tianjin 300301China Tianjin Aerospace Long March Technology and Equipment Co. Ltd.Tianjin 300462China

The microstructures and corrosion behaviors of as-cast,T4-treated,and T6-treated mg-6gd-3y-0.5zr alloys were systematically investigated by SEM,TEM,immersion test,and electrochemical corrosion *** results show that the microstructure of the as-cast alloy is composed ofα-mg and mg_(24)(gd,y)_(5)eutectic phase,and in T4-treated alloy,mg_(24)(gd,y)_(5)phase dissolves into theα-mg matrix,leading to an increase in the(y,gd)H_(2)*** T6 treatment,nanoscale mg_(24)(gd,y)_(5)phase dispersedly precipitates from theα-mg matrix,and exhibits a specific orientation relationship with theα-mg:(332)mg_((24)(gd,y)_(5))//(1011)_(α-mg),[136]mg_((24)(gd,y)_(5))//[1210]_(α-mg).The corrosion resistance of the mg-6gd-3y-0.5zr alloys can be ranked in the following order:T6-treated alloy exhibits the highest corrosion resistance,followed by the T4-treated alloy,and finally,the as-cast *** corrosion products of the alloys are all composed of mgO,mg(OH)_(2),gd_(2)O_(3),y_(2)O_(3),and mgCl_(2).The corrosion behavior of mg-6gd-3y-0.5zr alloy is closely related to the precipitated *** establishing the relationship between corrosion rate,hydrogen evolution rate,and corrosion potential,it is further demonstrated that during the micro galvanic corrosion process,the coarse mg_(24)(gd,y)_(5)phase in the as-cast alloy undergoes extensive dissolution,and(y,gd)H_(2)phase promotes the dissolution of theα-mg matrix in the T4-treated alloy,intensifying the hydrogen evolution *** T6-treated alloy,with dispersive precipitation of nanoscale mg_(24)(gd,y)_(5)phase,exhibits better corrosion resistance performance.

关键词： mg-6gd-3y-0.5zr alloy heat treatment microstructure precipitated phase corrosion resistance

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(y,gd)H_(2) phase formation in as-cast mg-6gd-3y-0.5zr alloy

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China Foundry 2021年第3期18卷 217-222页

作者： Fei Wang Bin-guo Fu yu-feng Wang Tian-shun Dong Guo-lu Li Xue-bo Zhao Jin-hai Liu Gui-xian Zhang School of Materials Science and Engineering Hebei University of TechnologyTianjin 300401China Tianjin Institute of Aerospace Mechanical and Electrical Equipment Tianjin 300301China Key Laboratory of Research and Application of Mould Materials for Glass and Rubber in Hebei Province Huanghua 061000China

In this work,a new(y,gd)H_(2) precipitate was identified and systematically investigated in the as-cast mg-6gd-3y-0.5zr alloy by XRD,SEM with EDS,TEM with EDS techniques and thermodynamics *** show that the as-cast alloy contains α-mg,mg_(24)(gd,y)_(5),and(y,gd)H_(2) ***(y,gd)H_(2) phase usually forms near the eutectic phase mg_(24)(gd,y)_(5) or in the α-mg grains,displaying a *** mg_(24)(gd,y)_(5) and(y,gd)H_(2) phases crystalize in bcc and fcc structure,respectively,and the(y,gd)H_(2) phase has a semi-coherent relationship with α-mg *** thermodynamics calculation results reveal that the hydrogen dissolved in the melt leads to the formation of *** is also found that the(y,gd)H_(2) hydride can form directly from the liquid phase during ***,it can precipitate by the decomposition of mg_(24)(gd,y)_(5) phase due to absorbing hydrogen from the remaining melt.

关键词： mg-6gd-3y-0.5zr alloy as-cast microstructure (y,gd)H_(2)phase formation mechanism

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