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Dislocation networks in gamma/gamma’-microstructures formed during selective laser melting of a Ni-base superalloy
Scripta Materialia ( IF 6 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.scriptamat.2020.08.019
L. Heep , C. Schwalbe , C. Heinze , A. Dlouhy , C.M.F. Rae , G. Eggeler

Abstract A dislocation network which formed during selective laser melting (SLM) of a Ni-base superalloy was analyzed using scanning transmission electron microscopy (STEM). This network traverses an ordered Gamma'-phase domain, in between two adjacent Gamma-solid solution regions. The Gamma’-phase region has formed when two Gamma’-phase particles have started to coalesce, trapping the dislocation network in this ordered region so that it formed two dislocation families with pairs of anti-phase boundary (APB) coupled super partial dislocations. The network features are presented and unusual features (twist character and low APB energies), not previously reported, are discussed.

中文翻译:

镍基高温合金选择性激光熔化过程中形成的γ/γ'-微结构中的位错网络

摘要 使用扫描透射电子显微镜(STEM) 分析了Ni 基高温合金在选择性激光熔化(SLM) 过程中形成的位错网络。该网络在两个相邻的 Gamma 固溶体区域之间遍历有序 Gamma' 相域。当两个 Gamma' 相粒子开始聚结时,Gamma' 相区域就形成了,在这个有序区域中捕获了位错网络,从而形成了两个位错族,其中有成对的反相边界 (APB) 耦合超部分位错。介绍了网络特征,并讨论了以前未报告的异常特征(扭曲特征和低 APB 能量)。
更新日期:2021-01-01
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