AN APFIM TEM STUDY OF CREPT MODEL NI-MO-TA-AL SUPERALLOYS

被引：3

作者：

JAYARAM, R

MILLER, MK

机构：

[1] Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge

来源：

SURFACE SCIENCE | 1992年 / 266卷 / 1-3期

关键词：

D O I：

10.1016/0039-6028(92)91039-E

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of initial microstructure and Mo composition on the high-temperature creep behaviour of two crept model Ni-x at.%Mo-2.0 at.%Ta-13.7 at.%Al(x = 8.7 and 9.2 at.%) superalloys has been investigated by the techniques of transmission electron microscopy (TEM) and atom probe field ion microscopy (APFIM). Acicular delta-phase precipitates of approximate stoichiometry NiMo have been observed by TEM and APFIM in both alloys. However, a marked difference in gamma' morphology is observed between the alloys due to different initial microstructures. Small variations in the initial morphologies of the gamma' microstructure rather than Mo composition play a significant role in affecting creep strength in this alloy system.

引用

页码：316 / 321

页数：6

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