低压预处理对TiAl抗氧化性的影响  

EFFECT OF LOW OXYGEN PARTIAL PRESSURE PRETREATMENT ON INTERRUPTED OXIDATION BEHAVIOR OF TiAl-BASED ALLOYS

作　　者：曲恒磊[1] 周廉[1] 魏海荣[2] 

机构地区：[1]西北有色金属研究院,西安710016 [2]东北大学,沈阳110006

出　　处：《腐蚀科学与防护技术》2000年第5期280-283,共4页Corrosion Science and Protection Technology

摘　　要：对 5种TiAl基合金进行了 1 0 - 3 Pa 1 0 4 0℃ 9h FC(炉冷 )表面预处理 .随后进行的 90 0℃静止空气中 1 0 0h断续氧化实验表明 ,TiAl的抗氧化性不但没有提高 ,反而明显下降 .抗氧化性下降的主要原因在于低压预处理过程中合金元素 (尤其是铝元素 )的选择性蒸发导致TiAl表面活化并形成Ti3Al相 ,而Ti3Al的抗氧化性较差 ,从而使TiAl整体氧化增重增加 .Surface pretreatment of Ti 48Al,Ti 50Al,Ti 52Al,Ti 48Al 1Cr and Ti 48Al 4Cr (at%) has been performed in 10 -3 Pa environment at 1040 ℃ for 9 hours.The reason why the pretreatment lowered the resistance to interrupted oxidation of TiAl based alloys at 900℃ lies in that there are no oxides (especially Al 2O 3) existing on the treated surface, but only intergranular cracked α 2 Ti 3Al phase, which exhibits a poor anti oxidation ability. The phenomenon is resulted from selective evaporation of alloy elements and related oxides, especially sublimation of aluminum.

关 键 词：TIAL基合金 抗氧化性 选择性蒸发 低压预处理 

分 类 号：TG146.23[一般工业技术—材料科学与工程] TG174.32[金属学及工艺—金属材料]