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用热重法研究了试样表面粗糙度及环境介质流动性对五种铸态TiAl基合金(Ti50Al,Ti48Al,Ti52Al,Ti48Al1Cr及Ti48Al4Cr)900℃断续氧化行为的影响。结果表明,表面粗糙度增加(7→4)时TiAl氧化加重;与静止空气介质(v=0mms-1)相比,空气流动(v=1mms-1)也使TiAl抗氧化性下降。前者因不可避免的计算误差和氧化内应力引起,后者由氧的供给量不同造成,但二者都与破裂氧化程度加重有关。
The effects of sample surface roughness and environmental fluidity on the intermittent oxidation behavior of five as-cast TiAl-based alloys (Ti50Al, Ti48Al, Ti52Al, Ti48Al1Cr and Ti48Al4Cr) at 900 ℃ were studied by TG method. The results show that the oxidation of TiAl increases with the increase of surface roughness (7 → 4). The air oxidation (v = 1mms-1) also decreases the oxidation resistance of TiAl compared with that of static air (v = 0mms-1) The former is caused by unavoidable calculation errors and internal stress oxidation, which is caused by the different supply of oxygen, but both are related to the increased degree of rupture oxidation.