摘要
研究了 Ti-50 Al,Ti-50 Al-1 5Cr,Ti-4 5Al-1 5Cr和 Ti-67Al-8Cr(原子百分数 )合金在 90 0～ 1 0 0 0℃下的高温氧化性能。结果表明 :Ti-50 Al-1 5Cr,Ti-4 5Al-1 5Cr和 Ti-67Al-8Cr均表现出优良的抗氧化性能 ,氧化后表面主要是 α-Al2 O3及少量的 Ti O2 组成。Ti-50 Al-1 5Cr,Ti-67Al-8Cr和 Ti-4 5Al-1 5Cr合金良好的抗高温氧化性能归于 Cr在合金抗氧化过程中起到了吸氧效应的作用。另外发现对于 Ti-50 Al-1 5Cr和 Ti-67Al-8Cr均发生了 950℃时的氧化增重比 1 0 0 0℃时的氧化增重大 ,这是由于 Cr的加入使 Ti的活性降低的缘故。
The high temperature oxidized behavior of Ti-50Al, Ti-50Al-15Cr, Ti-45Al-15Cr and Ti-67Al-8Cr (at.%)alloy at 900-1000°C was studied. The results show that Ti-50Al-15Cr, Ti-45Al-15Cr and Ti-67Al-8Cr have good oxidation resistance. The weight gain at 950°C for Ti-50Al-15Cr and Ti-67Al-8Cr is more than that at 1000°C, which is due to a decrease in titanium activity in Ti-Al-Cr alloys when Cr is added into Ti-Al alloys. Oxides formed on the surface of Ti-50Al-15Cr, Ti-45Al-15Cr and Ti-67Al-8Cr after oxidation consist of α-Al2O3 and tiny TiO2. The formation of Al2O3 is attributed to the role of Cr. Effect of Cr can be described by gettering effect.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2001年第1期73-77,共5页
Acta Aeronautica et Astronautica Sinica
