APFIM TEM CHARACTERIZATION OF SOLUTE PARTITIONING IN A MODEL NI-MO-AL-TA SUPERALLOY

被引：9

作者：

JAYARAM, R ^{[1
]}

HREN, JJ ^{[1
]}

MILLER, MK ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831

来源：

SURFACE SCIENCE | 1991年 / 246卷 / 1-3期

关键词：

D O I：

10.1016/0039-6028(91)90434-T

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：

A combined APFIM/TEM study of a model nickel-based Ni-Mo-Al-Ta superalloy has been performed to investigate the partitioning behaviour of Mo and Ta. Phase composition measurements on uncrept and failed creep-tested samples show that Mo partitions preferentially to the gamma phase and Ta to the gamma' phase. Composition profiles across gamma' interfaces showed no evidence for Mo or Ta segregation, apparently ruling this out as the mechanism responsible for the enhanced creep life of this alloy. DO22-ordered platelet precipitates were observed adjacent to the gamma' cuboidal precipitates. The presence of these DO22-ordered platelet precipitates would be an obstacle to dislocations and to the growth of the gamma' precipitates and hence might explain the good creep properties of alloys of this composition.

引用

页码：323 / 328

页数：6

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