GRAIN-BOUNDARY GAMMA'' PRECIPITATION AND NIOBIUM SEGREGATION IN INCONEL-718

被引：34

作者：

GAO, M

WEI, RP

机构：

[1] Department of Mechanical Engineering, Mechanics Lehigh University, Bethlehem

来源：

SCRIPTA METALLURGICA ET MATERIALIA | 1995年 / 32卷 / 07期

关键词：

D O I：

10.1016/0956-716X(95)00062-Z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The grain boundary γ″ precipitates in a commercial Inconel 718 have been critically examined by TEM. The results show that the grain boundaries were almost fully covered with γ″ particles which can account for the previous XPS finding of grain boundary enrichment in niobium for this alloy. These grain boundary γ″ precipitates appear to be disc-shaped, lie on the boundary plane, and have no habit-plane relationship with either of the neighboring grains. This finding suggests that the γ″ precipitates formed as a result of niobium segregation at the grain boundaries, rather than having the grain boundaries acting simply as the nucleation sites for preferential precipitation. © 1995.

引用

页码：987 / 990

页数：4

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