Isothermal Oxidation Behavior of a Cast Ni3Al-Base Superalloy MX 246A
The oxidation behavior of a cast Ni3Al-base superalloy MX246A in air over the temperature range of 1000℃ to 1200℃ for period up to 100h has been studied. The results indicate that the average oxidation rate of MX246A containing microstructure and composition of the oxide by means of a scanning electronic microscope with an EDAX unit. The results show that oxidation scale are composed of besides NiO、 NiAl2O4 and NiCr2O4. as well as a considerable quantity of α-Al2O3. The results also show that the addition of Hf and Y into MX246A significantly improves the oxidation resistance property of the alloy. Hf is effective mainly in the formation of HfO2 which is more stable in the strengthening of adhesion between the oxidation layer and the substrate, while Y restrains the segregation of Sulfur on the oxidation scale/substrate interface, as well as changing the morphology and composition of the oxidation scale, the degree of inner oxidation and the diffusion layer.
Ni3Al superalloy isothermal oxidation oxidation kinetics hafnium yttrium
DENG Wu-feng LUO He-li LI Shang-ping ZHOU Tie-tao
School of Material Science and Technology, Beijing University of Aeronautics & Astronautics,Beijing, Department of High-Temperature Materials,Central Iron and Steel Research Institute,Beijing, 100081,C
国际会议
北京
英文
59-65
2007-09-18（万方平台首次上网日期，不代表论文的发表时间）