Atomic scale investigation of ordering and precipitation processes in a model Ni-Cr-Al alloy

被引：14

作者：

Schmuck, C ^{[1
]}

Danoix, F ^{[1
]}

Caron, P ^{[1
]}

Hauet, A ^{[1
]}

Blavette, D ^{[1
]}

机构：

[1] OFF NATL ETUD & RECH AEROSP,CHATILLON,FRANCE

来源：

APPLIED SURFACE SCIENCE | 1996年 / 94-5卷

关键词：

D O I：

10.1016/0169-4332(95)00386-X

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：

The tomographic atom probe has been applied to the study of early stages of precipitation of the Ni3Al-type ordered gamma' phase in a model nickel base superalloy Ni-Cr-Al. The investigation of a low-supersaturated alloy (15 at% Cr, 5 at% Al) aged at 600 degrees C shows that small gamma' particles 2 nm in diameter form already after 1 h. Even for such very small sizes, particles are well ordered. Their composition is close to the equilibrium composition of the gamma' phase and does not evolve as ageing proceeds. The time evolution of the particle size and of the composition of the gamma matrix suggests that a growth mechanism is involved before 4 h, followed by a coarsening regime.

引用

页码：273 / 279

页数：7

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