摘要
研究了T6态Al-5Zn-2Mg(质量分数,%)铝合金在400℃和550℃氧化0~384 h的氧化行为。结果表明,T6态Al-5Zn-2Mg合金主要有η'相、η相、含Fe相和Al基体。η'相在晶内弥散分布,η相择优分布在晶界,含Fe相沿挤压方向(ED)呈条带状分布。在400℃氧化,合金的抗高温氧化性能良好。氧化0~92 h的合金,其质量微弱增加。氧化192~384 h,合金的增重不随时间的延长而改变。氧化384 h,合金的氧化增重只有0.07 mg/cm^(2)。在550℃氧化,合金的增重随着氧化时间的延长显著提高。氧化384 h,合金的氧化增重为0.33 mg/cm^(2)。合金在400℃氧化后其表面形貌基本不变且没有出现O元素富集。但是,在550℃氧化后合金的表面变成灰黑色,且在含Fe相处及其近邻区域发生了显著的氧化损伤,致使Mg和O元素富集。
The oxidation behavior of the T6-treated Al-5Zn-2Mg(in mass fraction)Al-alloy in air at 400 ℃ and 550 ℃ for 0 h to 384 h is comparatively studied via intermittent weighing,SEM+EDS and XRD etc.The results show that the alloy is mainly composed of Al-matrix withη'phase,ηphase and Fe-contain-ing phase.Among them,theη'phase is dispersed within grains,theηphase is preferentially distributed along grain boundaries,and the Fe-containing phase is mainly banded along the extrusion direction(ED).During oxidation at 400 ℃,the alloy exhibits good resistance to high temperature oxidation.Within the range of 0 h to 192 h,it shows a slight increase in mass.From 192 h to 384 h,the mass increase does not change significantly with time.After oxidation for 384 h,the mass increase is only 0.07 mg/cm^(2).Upon oxidation at 550 ℃,the mass of the alloy increases significantly with the extension of time.After oxidation for 384 h,its mass increased by 0.33 mg/cm^(2).Besides,failure analysis shows that the surface morpholo-gy of the alloy remained basically unchanged after oxidation at 400 ℃ and no O enrichment was ob-served on the surface.However,after oxidation at 550 ℃,the surface of the alloy turned gray-black,im-plying the occurrence of significant oxidation in the Fe-containing adjacent regions and its vicinity,result-ing in the enrichment of Mg and O there.
作者
卢翠兰
许道奎
王东亮
徐祥博
吕鑫
LU Cuilan;XU Daokui;WANG Dongliang;XU Xiangbo;LV Xin(Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China)
出处
《材料研究学报》
北大核心
2025年第11期824-836,共13页
Chinese Journal of Materials Research
基金
国家自然科学基金(U21A2049,52071220,51971054)。
关键词
金属材料
抗氧化行为
高温氧化处理
微观组织
氧化动力学
氧化膜形貌
metallic materials
oxidation resistance
high temperature oxidation treatment
micro-structure
oxidation kinetics
oxide film morphology
