【摘要】 为了解IC－6合金在高温氧化环境中的力学损伤行为．研究了900、1000、1100℃空气中预暴露100h后合金的组织变化和拉伸性能．合金在预暴露后强度变化不大。且在不高于1000℃下预暴露后合金拉伸塑性没有受到氧化损伤．与K17G镍基合金相比，IC－6合金所具有的这些明显优势被归因于定向凝固方法消除了横向晶界、抑制了空气中的氧沿晶扩散所造成的高温氧化环境的力学损伤．在1100℃预暴露后．由于在合金表面生成挥发性MoO3，合金基体沿枝晶间严重氧化，合金强度急剧下降．更多还原

【Abstract】 To understand the damage effects produced by hostile oxidizing environments on the mechanical properties of Ni3Al-Mo base IC-6 alloys. the present work concentrates on the changes in microstructure and attendant degradation in the tensile properties of IC-6 alloys at 850℃ in air following air pre-exposure treatments at 900, 1000 and 1100℃ for 100h. The strength of IC-6 alloy does not drop substantially and when exposed not in excess of 1000℃. ductility loss in IC-6 alloy was not observed as opposed to K17G nickel base superalloys. The excellent resistance of IC-6 alloys to environmental damage derives as unidirectional solidification technology successively eliminates the transverse grain boundaries, thereby precludes the mechanical loss occurrence effected by oxidizing environments as a result of oxygen inward diffusion along the otherwise existing grain boundaries. Preexposure at 1100℃ results in brittle fracture in IC-6 alloy by virtue of volatile MoO3 formation in oxide film and accompanying oxidizing attack deep into the interdendritical regions.更多还原