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用声发射(AcousticEmission)方法及扫描电镜SEM/EDXA,对Co－40Cr合金在1000℃空气中20h恒温氧化后表面氧化膜的开裂和剥落进行了研究.并与该合金表面离子注入3*1016Y+/cm2和3*1017Y+/cm2后的氧化结果进行了比较.结果表明,离子注钇后极大地改善了合金表面氧化膜的抗开裂和抗剥落性能.此外,用声发射方法能够间接地测量出氧化膜/合金界面处“预存缺陷”(pre-existingdefects)的分布情况.离子注钇改善合金表面氧化膜的粘附性与注钇后减小了界面处“预存缺陷”的数目及平均大小有关.“,”Acoustic emission (AE) and SEM/EDXA were used to study the cracking and spalling behavior of the scale formed on Co-40Cr alloy after 20 h isothermal oxidation in air at 1000℃. By comparing the cracking and spalling behavior of scale formed on 3*1016Y+/cm2 and 3*1017Y+/cm2 implanted and non-implanted Co-40Cr alloys, it was found that yttruim implantation greatly improved the anti-cracking and anti-spalling properties of the scale. AE was used to study the distribution of pre-existing defects at the scale/alloy interface. The improvement of adhesion of the scale formed on yttrium-implanted aloy was attributed to the decrease in the size and number of pre-existing defects at the scale/alloy interface.