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

摘要:

β γ-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 β γ-TiAl Ti-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

Abstract:

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