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采用化学相分析、X射线桁射、SEM等方法研究了微量Mg、Zr在GH698合金析出相间分配规律,及其对γ′的相组成、热稳定性和晶格常数的影响。还研究了Mg在铸态合金经1170℃加热时的扩散现象。结果表明,当合金中Mg含量≤0.012％时,Mg主要进入γ-固溶体,γ′中Ti(Nb)/Al(原子％)比值随Mg含量增加稍有提高;当Mg含量>0.012％时,Mg进入γ′和碳化物中,γ′的Ti(Nb)/Al比值则下降。可以认为,合金强度性能与此比值有关。加入到合金中的Zr主要进入γ′,增大γ′的晶格常数,提高γ′的溶解温度,细化γ′的粒度。
The distribution rules of trace Mg and Zr in precipitated phases of GH698 alloy were studied by chemical phase analysis, X-ray truss radiography and SEM, and their effects on the phase composition, thermal stability and lattice constant of γ ’were also studied. The diffusion of Mg in as-cast alloy heated at 1170 ° C was also studied. The results show that when the content of Mg in the alloy is less than or equal to 0.012%, Mg mainly enters γ-solid solution and the ratio of Ti (Nb) / Al (atomic%) in γ ’slightly increases with the increase of Mg content. Mg enters γ ’and carbides, and the γ (Nb) / Al ratio of γ’ decreases. It can be considered that the strength of the alloy is related to this ratio. Zr added to the alloy mainly enters γ ’, increases the lattice constant of γ’, increases the dissolution temperature of γ ’, and fines the particle size of γ’.