Two-phase intermetallic alloy Ni3(Al, Si):: microstructure and mechanical properties

被引：6

作者：

Merabtine, R ^{[1
]}

Devaud-Rzepski, J ^{[1
]}

Trichet, MF ^{[1
]}

Cornet, M ^{[1
]}

机构：

[1] CNRS, Ctr Etud Chim Met, F-94407 Vitry Sur Seine, France

来源：

INTERMETALLICS | 2001年 / 9卷 / 12期

关键词：

nickel aluminides; based on Ni3Al; mechanical properties at high temperatures; precipitates; yield stress;

D O I：

10.1016/S0966-9795(01)00062-0

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：

Yield stress in compression (0.2% flow stress) from ambient temperature up to 800 degreesC has been studied on Ni-3(Al, Si) alloy with the atomic composition Ni78Al11Si11. When annealed at 1000 degreesC, the alloy has a pure L1(2) (gamma') ordered structure. After subsequent annealing at 750 degreesC, the disordered solid solution of Al and Si in Ni (face centred cubic, gamma) precipitates in fine coherent particles. Calorimetry helps to describe the various phase transformations necessary to obtain the last microstucture. Solute addition of Si, which replaces A1 atoms, increases the 0.2% flow stress of Ni3Al in the fully gamma' microstructure. The gamma precipitation shifts the peak stress towards higher temperatures and stresses. (C) 2001 Elsevier Science Ltd. All rights reserved.

引用

页码：1015 / 1020

页数：6

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