对５种ＴｉＡｌ基合金进行了１０＾－３Ｐａ／１０４０℃／９ｈ／ＦＣ（炉冷）表面预处理。随后进行的９００℃静止空气中１００ｈ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 %48Al, Ti-50Al,X-52Al, Ti-48Al-1Cr and Ti-48Al-4G (at% ) has been performed in Pa envimnnent at 1040 "C for 9 hours.The reason why the pretreamnt lowered the resistance to interrupted oxidation of TA-based alloys at 900°C lies in that there are no oxides (especially A12Q) existing on the treated surface, but only intergmnular cracked a2-Ti3Al phase, which exhibits a poor anti-cotidation ability. The phenanenon is resulted fmn selective evaporation of alloy elements and related oxides, especially sublimation of aluminum.
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