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利用螺旋选晶法制备不同Ta含量的镍基单晶合金,研究Ta对合金微观组织及蠕变机制的影响。结果表明:Ta改变了合金中γ’相的形貌,随着Ta含量的提高,γ’相由椭圆形向方形转变;Ta促进了Mo在γ基体中的溶解,增大了合金的错配度;Ta对镍基单晶合金的高温蠕变寿命有较大影响,随着Ta含量的提高,合金的蠕变寿命增加;Ta促进了γ/γ’界面的位错网的发展与完善,影响了蠕变变形过程中位错的运动方式。
The preparation of different single crystal nickel alloys with different content of Ta by spiral pick-up method was used to study the effect of Ta on the microstructure and creep mechanism of the alloy. The results show that Ta changes the morphology of the γ ’phase in the alloy. As the content of Ta increases, the γ’ phase changes from elliptical to square. Ta promotes the dissolution of Mo in the γ matrix and increases the alloy mismatch Degree; Ta has a significant effect on the creep life of Ni-based single crystal alloys. With the increase of Ta content, the creep life of the alloys increases. Ta promotes the development and improvement of the dislocation network at γ / γ ’ Affects the movement of dislocations during creep deformation.