Microstructure of a newly developed γ′ strengthened Co-base superalloy

被引：39

作者：

Ping, D. H. ^{[1
]}

Cui, C. Y. ^{[1
]}

Gu, Y. F. ^{[1
]}

Harada, H. ^{[1
]}

机构：

[1] Natl Inst Mat Sci, High Temp Mat Ctr, Tsukuba, Ibaraki 3050047, Japan

来源：

ULTRAMICROSCOPY | 2007年 / 107卷 / 09期

关键词：

Co-base superalloy; microstructure; TEM; microanalysis; COBALT-NICKEL-TITANIUM; UDIMET; 720LI; PHASE; SYSTEM; TI;

D O I：

10.1016/j.ultramic.2007.02.010

中图分类号：

TH742 [显微镜];

学科分类号：

摘要：

The microstructure of a newly developed Co-base superalloy with enhanced high-temperature strength has been investigated using transmission electron microscopy (TEM) and three-dimensional atom probe (3DAP) techniques. It mainly consists of a typical gamma/gamma' (FCC/L1(2)) structure and a plate-shaped AB(3)-type (Ni, Co, Cr)(3)(Ti, Al) intermetallic compound with hexagonal structure (a similar to 5.1 angstrom and c similar to 12.5 angstrom). gamma' is formed with a bimodal distribution and fine gamma' has a cuboidal morphology. Cr and Co are enriched in the gamma phase, while Ti, Al and Ni are enriched in the gamma' phase. W and Mo are more or less uniformly distributed in both gamma and gamma'. Chemical composition analysis by 3DAP suggests that the plate-shaped phase has a higher Ti and lower Al content compared to that of gamma' phase, and the concentration of Ti, Co and Ni has a periodic variation along c-axis with a period of 12.5 angstrom in the plate-shaped phase. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：791 / 795

页数：5

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