Microstructure investigations of Pt-modified γ′-Ni3Al + γ-Ni coatings on Ni-based superalloys

被引：9
作者：
Cao, Guanghui [1 ,2 ]
Ou, Taoping [1 ,2 ]
Jiang, Hua [1 ,2 ]
Russell, Alan M. [3 ,4 ]
机构：
[1] Shanghai Univ, Dept Mat Engn, Shanghai 200072, Peoples R China
[2] Shanghai Univ, Shanghai Key Lab Modern Met & Mat Proc, Shanghai 200072, Peoples R China
[3] Iowa State Univ, Ames Lab, US Dept Energy, Ames, IA 50011 USA
[4] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA
来源：
JOURNAL OF MATERIALS RESEARCH | 2010年 / 25卷 / 06期
关键词：
THERMAL BARRIER COATINGS; NICKEL-BASE SUPERALLOY; NI-BASED SUPERALLOYS; OXIDATION BEHAVIOR; MU-PHASE; NIPTAL COATINGS; HOT CORROSION; BOND COAT; PLATINUM; PRECIPITATION;
D O I：
10.1557/JMR.2010.0148
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure of Pt-modified gamma'-Ni3Al + gamma-Ni coating on CMSX-4 single-crystal superalloy has been investigated by transmission electron microscopy (TEM). Cross-sectional TEM analyses showed the presence of precipitates in the coating. This precipitate was identified as the hexagonal topologically close-packed (TCP) mu phase with lattice parameters a = 0.473 nm and c = 2.565 nm. The energy-dispersive x-ray (EDX) spectrum of the mu phase suggested a refractory element rich compound comprising the elements Re, W, and Co. Twin domains parallel to (001) were found in the mu phase. The mechanisms of the mu phase and twinning formation were discussed.
引用
收藏
页码：1191 / 1195
页数：5
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