摘要
采用金属蒸气真空电弧 (MEVVA)离子源将稀土Y ,Er离子分别注入γ TiAl金属间化合物 ,注入能量为 5 0～ 6 0keV ,注入剂量为 1× 10 17cm-2 。研究了γ TiAl在空气中 80 0～ 90 0℃ ,2 0 0h的循环氧化行为。结果表明 ,Y ,Er离子注入γ TiAl的氧化增重比原始试样均未见明显减小 ,同时出现了严重的氧化膜剥落现象。不同于稀土改善Fe ,Co和Ni基高温合金抗氧化性能 ,Y ,Er离子注入不具有增加氧化膜粘附性 ,改善γ TiAl抗氧化性能的作用。
A γ TiAl intermetallic compound was implanted with rare earth elements of Y and Er respectively to a dose of 1×10 17 ions cm -2 at an ion energy of 50～60?keV by using a metal evaporation vapor vacuum arc (MEVVA) ion source. The cyclic oxidation tests for the implanted samples were performed at the oxidation temperatures of 800 and 900?℃ up to 200?h in air. It was found that the clear decrease of oxidation mass gains for the Y and Er implanted samples was not reached compared to that of the unimplanted at the both oxidation temperatures, consequently, the implanted samples were prone to severer spallation of oxide scales. Both the rare earth elements can not increase adhesion of the oxide scales on γ TiAl and then improve its oxidation resistance, which indicates the difference from their positive effect in oxidation resistance of conventional Fe , Co and Ni based high temperature alloys.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2001年第6期1021-1025,共5页
The Chinese Journal of Nonferrous Metals
