Characterization of γ′ precipitate and γ/γ′ interface in polycrystalline Ni3Al-based superalloys

被引：19

作者：

Li, Yefan ^{[1
]}

Li, Chong ^{[1
]}

Yu, Liming ^{[1
]}

Ma, Zongqing ^{[1
]}

Li, Huijun ^{[1
]}

Liu, Yongchang ^{[1
]}

机构：

[1] Tianjin Univ, State Key Lab Hydraul Engn Simulat & Safety, Sch Mat Sci & Engn, Tianjin 300354, Peoples R China

来源：

VACUUM | 2020年 / 176卷

基金：

中国国家自然科学基金;

关键词：

Ni3Al-Based superalloy; Rapid solidification; Elemental partitioning; gamma/gamma ' interface characters; Lattice misfits; Nanoindentation; NI-BASED SUPERALLOY; SOLUTION COOLING RATE; ALLOYING ELEMENTS; ELASTIC PROPERTIES; LATTICE MISFIT; SITE PREFERENCES; MICROSTRUCTURE; NI3AL; EVOLUTION; BEHAVIOR;

D O I：

10.1016/j.vacuum.2020.109310

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure, element segregation and gamma/gamma' interface characters of polycrystalline Ni3Al-based superalloys under conventionally solidified (similar to 10 K/s) and rapidly solidified (similar to 10(3) K/s) conditions were investigated. Cr and Fe are primarily partitioned into the gamma phase while Al and Ni are into gamma' phase. However, rapid solidification rate of spray casting alloy improves the solubility of Cr and Fe elements at the expense of Al in gamma' phase, which decreases the lattice parameters of gamma and gamma' phases. Moreover, it further increases the absolute value of gamma/gamma' lattice misfit and contributes to the formation of (100) plane misfit dislocations in gamma/gamma' interface. As a result, spray casting specimen possesses higher hardness (6.5 +/- 1.0 GPa) and elastic moduli (166.4 +/- 15.9 GPa) than that in as-cast alloy with lower solidification rate.

引用

页数：7

共 38 条

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