【摘要】 本文研究了微量元素硼、锆和钛等对铸造Ni₃Al基合金疲劳行为的影响,并用S360扫描电镜观察其循环形变（滑移）,疲劳裂纹萌生和扩展特征,以及研究γ′（Ni₃Al）相（包括γ′+γ共晶小大,分布）和γ′+γ/γ相界而,Ni₃Al多晶体晶界和缺陷淀对疲劳裂纹生长的影响。更多还原

【Abstract】 Fatigue behaviour of cast Ni₃Al-based alloys with the addition of alloying elements Such as Hf, Zr and Ti etc has been studied, and the characteristics of cyclic deformation（slip） and fatigue crack’s initiation and propagation in cast Ni₃Al-based alloys were observed by S360 SEM. The effects of γ’ （Ni₃Al） phase （incuding γ’+γ eutectic size and distribution）, γ’+γ/γ phase interface as well as defects and grain-boundary in polycrystalline Ni₃Al on fatigue crack growth were investigated.更多还原