(大连理工大学 材料工程系， 大连 116024)
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50～60keV，注入剂量为1×1017cm-2。研究了γ-TiAl在空气中800～900℃，200h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。
关键字: 金属间化合物； 高温氧化； 稀土； 离子注入
oxidation behavior ofγ-TiAl intermetallic compound
（Department of Materials Engineering， Dalian University of
Technology， Dalian 116024， P.R.China）
Abstract:A γ-TiAl intermetallic compound was implanted with rare earth elements of Y and Er respectively to a dose of 1×1017 ions cm-2 at an ion energy of 50～60keV 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 200h 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 onγ-TiAl and then improve its oxidation resistance， which indicates the difference from their positive effect in oxidation resistance of conventional Fe-， Co- and Nibased high-temperature alloys.
Key words: intermetallic compound； high-temperature oxidation； rare earths； ion implantation
