Coarsening behavior of γ′ and γ″ phases in GH4169 superalloy by electric field treatment
Coarsening behavior of γ′ and γ″ phases in GH4169 superalloy by electric field treatment
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DOI：
10.1007/s12613-013-0807-3
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发表时间：
2013-09
期刊：
影响因子：
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通讯作者：
Lei Wang;Yao Wang;Yang Liu;Xiu Song;X. Lü;Bei-jiang Zhang
中科院分区：
文献类型：
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作者：
Lei Wang;Yao Wang;Yang Liu;Xiu Song;X. Lü;Bei-jiang Zhang
采用透射电子显微镜（TEM）和正电子湮灭寿命谱（PALS）研究了电场处理（EFT）下1023和1073 K时效GH4169合金中γ′和γ″相的粗化行为。结果表明，在电场作用下，γ′相和γ″相的生长活化能分别降至115.6和198.1 kJ·mol−1。EFT在基体中引起大量空位的形成。在1023 K和1073 K时，由于空位迁移的发生，Al和Nb原子的扩散系数比没有EFT的扩散系数增大了1.6 ~ 5.0倍。此外，EFT促进了空位团簇的形成，而γ′和γ″相粗化导致的应变能增加可以通过空位团簇的形成来抵消。
The coarsening behaviors ofγ′ andγ″ phases in GH4169 alloy aged at 1023 and 1073 K with electric field treatment (EFT) were investigated by transmission electron microscopy (TEM) and positron annihilation lifetime spectroscopy (PALS). It is demonstrated that precipitation coarsening occurs, and the growth activation energies ofγ′ andγ″ phases can be decreased to 115.6 and 198.1 kJ·mol−1, respectively, by applying the electric field. The formation of a large number of vacancies in the matrix is induced by EFT. Due to the occurrence of vacancy migration, the diffusion coefficients of Al and Nb atoms are increased to be 1.6–5.0 times larger than those without EFT at 1023 or 1073 K. Furthermore, the formation of vacancy clusters is promoted by EFT, and the increase in strain energy for the coarsening ofγ′ andγ″ phases can be counterbalanced by the formation of vacancy clusters.