V/Nb对Ti-45Al-9(V,Nb,Y)合金抗氧化性能的影响

Effect of V/Nb on the Oxidation Resistance of Ti-45Al-9(V,Nb,Y) Alloy

βγ-TiAl合金具有良好的高温变形能力,为TiAl合金的发展开辟了新的途径。成功制备了不同x=V/Nb(x=1,1.5,2,3.5)的βγ-TiAlTi-45Al-9(V,Nb,Y)合金,研究了上述合金在800℃静止空气中的氧化行为。结果表明:当x=1时,Ti-45Al-9(V,Nb,Y)合金中形成条带状、连续致密的Al2O3氧化层,显著提高了合金的抗氧化能力。随着x=V/Nb的增加,Al2O3氧化层厚度变薄,合金的抗氧化能力下降。

β γ-TiAl alloy owns excellent deformability at high temperature,so it exhibits great potential in different fields in future.Ti-45Al-9（V,Nb,Y） alloys with different x=V/Nb（x=1,1.5,2,3.5） were prepared,and their cyclic oxidation behavior in static air at 800 oC was investigated.The results show that Ti-45Al-9（V,Nb,Y） alloy possesses high oxidation resistance when x=1,due to the strip-like,continuous and dense Al2O3 layer.However,the Al2O3 layer becomes thinner with increasing of x=V/Nb,resulting in poor oxidation resistance of Ti-45Al-9（V,Nb,Y） alloy.