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研究了铝含量对一种镍基单晶合金铸态和热处理态显微组织的影响,测试了单晶合金的高温持久性能,利用金相显微镜、SEM、TEM、XRD等考察了持久断裂试样的微观形貌。结果表明,单晶合金的铸态组织由粗大的γ’、细小的γ’和γ组成,随Al含量的增加,粗大的γ’相数量增多、尺寸增大。固溶处理不能使粗大的γ’完全固溶,持久断裂裂纹主要在粗大的γ’/γ界面产生,并沿γ’/γ界面扩展,严重损伤合金的高温持久性能。
The effect of aluminum content on microstructures of as-cast and heat-treated nickel-based single crystal alloys was investigated. The high temperature durability properties of single crystal alloys were tested. The microstructure of long-term fracture specimens was investigated by metallographic microscope, SEM, TEM and XRD. The micro-morphology. The results show that as-cast microstructure of single crystal alloy consists of coarse γ ’, fine γ’ and γ. With the increase of Al content, the amount of coarse γ ’phase increases and the size increases. The solution treatment did not completely dissolve the coarse γ ’. The permanent fracture was mainly generated at the coarse γ’ / γ interface and extended along the γ ’/ γ interface, which seriously damaged the high temperature durability of the alloy.