微量稀土合金化对AZ80镁合金高温氧化动力学的影响  

Effects of Trace Rare Earth Alloying on High Temperature Oxidation Kinetics of AZ80 Magnesium Alloy

作　　者：曹泽宇 王廷之 乐启炽[1] 黄卓寒 冯超琦 Cao Zeyu;Wang Tingzhi;Le Qichi;Huang Zhuohan;Feng Chaoqi(Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University)

机构地区：[1]东北大学材料电磁过程研究教育部重点实验室,沈阳110819

出　　处：《特种铸造及有色合金》2022年第6期754-761,共8页Special Casting & Nonferrous Alloys

基　　金：国家级大学生创新创业训练计划资助项目(202110145058);中央高校基本科研业务专项资金资助

摘　　要：研究了微量稀土对AZ80镁合金高温氧化动力学及氧化膜特征的影响。采用熔铸法制备了AZ80、AZ80-0.32Y、AZ80-0.47Gd和AZ80-0.38Nd(质量分数,%)合金;测定合金第二相熔点,进行等温氧化试验;观察铸态组织和氧化膜层的形貌。结果表明,微量稀土的添加没有提高β-Mg_(17)Al_(12)相的熔点,但在组织中生成Al_(2)Y,Al_(2)Gd和Al_(2)Nd高温熔点相,一定程度消除了β相,提升了AZ80镁合金的高温抗氧化能力。此外,稀土元素的添加能改善合金的氧化成膜性并促进氧化层的致密化。The effects of trace rare earth alloying on the oxidation kinetics and oxide film characteristics of AZ80magnesium alloy were analyzed at high temperature.AZ80,AZ80-0.32Y,AZ80-0.47Gd and AZ80-0.38Nd(mass fraction,%)alloy were prepared by melting and casting method.Melting point of the second phase in the alloy was measured,and the isothermal oxidation experiment was carried out.The as-cast microstructure and the oxide film of the alloy were observed.The results reveal that the addition of trace rare earth elements cannot increase the melting point of β-Mg_(17)Al_(12) phase,however the high temperature melting point phases of Al_(2)Y,Al_(2)Gd and Al_(2)Nd are generated in the matrix,which eliminate theβphase to some extent and improve the high temperature oxidation resistance of AZ80magnesium alloy.Moreover the addition of rare earth elements can improve the oxidation film formation of the alloy and promote the densification of the oxide layer.

关 键 词：AZ80镁合金 稀土 高温氧化 氧化动力学 

分 类 号：TG174.4[金属学及工艺—金属表面处理]