The distribution of Ir in Ni-base single-crystal superalloys

被引：0
|
作者：
Murakami, H [1 ]
Honma, T [1 ]
Yokokawa, T [1 ]
Koizumi, Y [1 ]
Harada, H [1 ]
机构：
[1] Natl Res Inst Met, Tsukuba, Ibaraki 3050047, Japan
来源：
IRIDIUM | 2000年
关键词：
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microscopic distribution of Ir in Ni-N-Ir ternary alloys and Ni-base single crystal superalloys was investigated. It is found from SEM-EDS analysis that in Ni-18at%Al-Ir ternary alloys, Ir has a preference to partition to the gamma phase. On the other hand, partitioning behaviour of Ir in multicomponent Ni-base single crystal superalloy changes depending on alloy composition. Atomprobe field ion microscopy (APFIM) revealed that for Re-free alloy TMS-79, Ir atoms have a small preference to be located in the gamma phase, while for Re-containing TMS-80, Ir tends to partition to the gamma' precipitates. These results suggest that among alloying elements, 'competition of partitioning' takes place in multi-component alloys. The experimental results were compared with numerical estimations by cluster variation method (CVM) and showed reasonable agreement.
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页码：121 / 128
页数：8
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