(北京科技大學(xué)表面科學(xué)與腐蝕工程系，北京 100083;
西北工業(yè)大學(xué)材料科學(xué)與工程學(xué)院， 西安 710072)
摘 要: 應(yīng)用高能量密度等離子體對Ni3Al進行微晶化處理，在合金表面獲得了晶粒尺寸小于300 nm的微晶層。對比研究了Ni3Al微晶處理前后在氧氣中1000 ℃高溫氧化的行為和規(guī)律。發(fā)現(xiàn)微晶化處理后的試樣氧化膜晶粒被極大地細化，合金中Al選擇氧化得到促進，氧化速率明顯降低， 氧化動力學(xué)服從四次方規(guī)律x4=kpt。
關(guān)鍵字: Ni3Al 微晶 高溫氧化 腐蝕
（1 Department of Surface Science and Corrosion Engineering,
University of Science and Technology Beijing, Beijing 100083 , P. R. China
2 Department of Materials Science and Engineering,
?Northwestern Polytechnical University, Xi'an 710072, P. R. China）
Abstract:High energy density plasma (HEDP) technique was applied to surface treatment of Ni3Al. A micro-crystalline layer with grain sizes smaller than 300 nm was obtained. Isothermal oxidation at 1000 ℃ in oxygen for Ni3Al before and after micro-crystallizing was studied. The results showed that for the micro-crystalline Ni3Al, the grain of scale turns into very small, the selective oxidation of aluminium is promoted, the oxidation rate is decreased and the oxidation kinetics obeys the forth power equation: x4=kpt.
Key words: Ni3Al micro-crystalline high temperature oxidation corrosion
