利用螺旋选晶法制备了一种不含Re的低成本镍基单晶合金,研究合金在不同温度下的蠕变变形机理.结果表明:在850 ℃×441 MPa条件下,合金的蠕变变形主要是大量位错在基体中的滑移和对增强相的切割；在950℃×250 MPa条件下,合金的蠕变变形主要是位错以层错的形式切割γ′相；在1 040℃×137 MPa条件下,合金的蠕变变形比较复杂,既有位错在基体中的滑移,也有位错攀移通过增强相,同时在γ/γ′界面处形成部分位错网.
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