TA15钛合金高温氧化行为  

Oxidation behaviors of TA15 titanium alloy

作　　者：王琪[1] 文智[1] 易丹青[1] 王斌[1] 王福晶[1] 肖东东[1] 陈振湘[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《粉末冶金材料科学与工程》2012年第5期571-578,共8页Materials Science and Engineering of Powder Metallurgy

基　　金：国家高技术研究发展计划(863计划)资助项目(2011AA030101)

摘　　要：研究TA15钛合金在750-950℃,空气中氧化1-150 h的氧化动力学规律,采用SEM、XRD及EPMA测试技术分析该合金氧化层的显微组织形貌、相组成和复合结构,并对氧化膜的生成机理进行探讨。结果表明：合金在750、850和950℃温度下的氧化行为均符合抛物线规律,但在950℃以上随氧化温度的升高和保温时间的延长,氧化质量增加值持续升高,并远大于750℃和850℃时的氧化质量增加。750℃和850℃下氧化150 h后,合金氧化层结构为TiO2/Al2O3/TiO2/基体;950℃下氧化150 h后合金的氧化层结构为TiO2/Al2O3/TiO2/Al2O3/TiO2/Ti3Al/基体。The oxidation kinetics of TA15 alloy including mass gain vs time and temperature have been studied in the condition of 750~950 ℃,1~150 h,in air atmosphere.The changes of substrate and oxidized surface layer of the alloy were examined by means of SEM,X-ray diffraction and EPMA.The oxidation mechanism has also been explored.The results show that the alloy oxidation behavior obeys parabolical law at 750~950 ℃.The mass gain at 950 ℃ increases with increasing oxidation temperature and holding time,and it is much higher than that of at 750 oC and 850 ℃.The oxidation layer formed at 750 ℃ and 850 ℃ for 150 h consists of TiO2/Al2O3/TiO2,ranging from the surface to the substrate.The oxidation results at 950 ℃ for 150 h indicate that the composition of oxidation layer is TiO2/Al2O3/TiO2/ Al2O3/ TiO2/ Ti3Al/substrate.

关 键 词：钛合金 高温氧化 氧化层 扩散 

分 类 号：TG117.7[金属学及工艺—物理冶金]