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.
作者
曹泽宇
王廷之
乐启炽
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)
出处
《特种铸造及有色合金》
CAS
北大核心
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
关键词
AZ80镁合金
稀土
高温氧化
氧化动力学
AZ80Magnesium Alloy
Rare Earth
High-temperature Oxidation
Oxidation Kinetics
