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吕迎， 李俊刚， 朱永长， 吴明忠， 张彦超
（佳木斯大学 材料科学与工程学院， 黑龙江 佳木斯 154007）摘要：研究了铸态AZ91D镁合金在不同温度下保温2 h的表面氧化质量增加、表面氧化膜形貌以及相成分变化，并利用金相显微镜、SEM、XRD等检测手段进行分析。结果表明：铸造AZ91D镁合金主要由α-Mg、共晶相(α-Mg+β-Mg17Al12)组成。当氧化温度由400 ℃升高至550 ℃，铸造AZ91D镁合金氧化增重由0.08%提高至9.5%，相成分则由占主体的α、β相转变成复合氧化物组成的燃烧产物。400 ℃氧化时，合金表面发生均匀氧化而形成很薄的氧化膜；450 ℃时，表面局部区域发生了重点氧化；500 ℃时，氧化膜急剧增厚，局部产生应力集中而造成氧化膜开裂；温度升至550 ℃，由于热量的累积提高了反应界面的温度，AZ91D镁合金发生剧烈的燃烧反应而形成粉体。
关键词： 镁合金； 加热温度； 氧化； 表面形貌； 相组成
中图分类号： TG 146.2文献标志码: A
Effect of Temperature on Surface Oxide Film of
As-cast AZ91D Magnesium Alloy L Ying, LI Jun-gang, ZHU Yong-chang, WU Ming-zhong， ZHANG Yan-chao
(School of Materials Science and Engineering, Jiamusi University, Jiamusi 154007, China)Abstract: In the case of heat treatmemt at different temperatures for 2 h, the surface oxidation weight increase, surface morphology and phase composition change of as-cast AZ91D magnesium alloy were investigated and analyzed by using of the metalloscope, SEM and XRD. Results showed that AZ91D magnesium alloy consisted of α-Mg and eutectic phase (α-Mg+β-Mg17Al12). When the temperature increased from 400 ℃ to 550 ℃, the oxidation weight of AZ91D magnesium alloy increased from 0.09% to 9.5%, accordingly the α and β phase of the dominant phase composition transformed into the combustion products constituted by complex oxide. At 400 ℃, homogeneous oxidation happened and a very thin film formed on the surface of the AZ91D alloy. At 450 ℃, major oxidation occurred on partial surface region. At 500 ℃, the oxide film thickness increased dramatically and the local stress concentration resulted in cracking of the oxide film. When the temperature increased to 550 ℃, AZ91D magnesium alloy happened violent combustion reaction and formed powder because the heat accumulation increased the temperature of reaction interface.
Key words: magnesium alloy; heat temperature; oxidation; surface morphology; phase composition
收稿日期：2011-06-22
基金项目：佳木斯大学科研项目(L2009097)；黑龙江省佳木斯大学生物材料重点实验室课题项目(L5309)；黑龙江省科技计划项目(WB07B04)；佳木斯大学教研项目(2009081).
作者简介：吕迎(1979—)，女，讲师。
