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中文摘要：
利用透射电镜能谱法（TEM-EDX）研究了GH742合金中γ′和γ基体两相成分随温度和时效时间的变化规律。结果表明：合金在1050℃时效时，γ′相和γ基体的成分在时效初期变化较大，当时效时间超过1440min后，γ′相和γ基体的成份基本稳定。合金在750-1100℃时效时，γ′相和γ基体的成分均随着温度的升高而发生变化，其中γ基体的成分随温度变化较明显。合金中各元素在γ′和γ两相中的偏析率Cγ′／Cγ变化规律研究表明：Ti，Al，Nb，Ni等γ′形成元素的偏析率均随着时效温度的升高而降低，而Cr，Co，Mo等γ形成元素的偏析率均随着时效温度的升高而增大。
英文摘要：
The phase composition of γ′ phase and γ matrix in GH742 was investigated by energy dispersive of X-ray spectroscopy （EDX） in an analysis transmission electron microscope （TEM-EDX）. The dependence of composition of γ′ and γ phase on aging time indicates that the composition of γ′ and γ phase evolves drastically in short aging time at the temperature of 1050℃ and reaches the equilibrium condition when aging for 1440 min. The dependence of composition of γ′ and γ phase on temperature indicates that the composition of γ′ and γ phases evolves with the increasing temperature in the range of 750℃ to 1100℃. The dependence of partitioning ratios Cγ′/Cγ on temperature shows that the partitioning ratios Cγ′/Cγ of γ′-forming elements Ti, Al, Nb, Ni have a decrease and those of γ-forming elements Cr, Co, Mo have an increase with the temperature increasing.
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