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通过扩散渗法在DZ125合金表面制备了Ce-Y联合改性铝化物渗层,分析了共渗层的结构及相组成,并对其组织形成机理和抗冲蚀性能进行了研究。结果表明:1000℃/2 h下所制备的Al-Ce-Y共渗层具有多层结构,由外向内依次为Ni Al和少量Al_3Ni_2组成的外层,Al_3Ni_2内层及富Al的互扩散层,Ce、Y元素主要集中在共渗层的外层,起到细化晶粒及促渗的作用。固体粒子冲蚀结果表明:Al-Ce-Y共渗显著的提高了DZ125合金在小攻角下的抗固体粒子冲蚀性能,冲蚀机理为犁削和切削损伤;随着攻角的增大,Al-Ce-Y共渗层的冲蚀率逐渐增大,冲蚀机理向脆性断裂和疲劳破坏转变,当攻角为90o时,其冲蚀率高于DZ125基体。
The diffusion layer infiltration method was used to prepare Ce-Y combined aluminide infiltrated layer on the surface of DZ125 alloy. The structure and phase composition of the co-infiltrated layer were analyzed. The formation mechanism and erosion resistance of the alloy were studied. The results show that the Al-Ce-Y co-diffusion layer prepared at 1000 ℃ / 2 h has a multi-layer structure with an outer layer composed of Ni Al and a small amount of Al 3 Ni 2, an inner layer of Al 3 Ni 2 and an Al-rich interdiffusion layer , Ce, Y elements are mainly concentrated in the outer layer of the infiltration layer, play the role of grain refinement and permeability. The results of solid particle erosion show that Al-Ce-Y co-infiltration significantly improves the anti-solid particle erosion resistance of DZ125 alloy at small angle of attack, and the erosion mechanism is plowing and cutting damage. With the increase of angle of attack , The erosion rate of Al-Ce-Y co-diffusion layer gradually increases, and the erosion mechanism changes to brittle fracture and fatigue failure. When the angle of attack is 90o, the erosion rate is higher than that of DZ125 matrix.