Ordering and phase separation in Ni-Cr-Al: Monte Carlo simulations vs three-dimensional atom probe

被引：115

作者：

Pareige, C

Soisson, F

Martin, G

Blavette, D ^{[1
]}

机构：

[1] Univ Rouen, Grp Met Phys, UMR 6634 CNRS, F-76821 Mt St Aignan, France

[2] Ctr Etud Saclay, DECM, SRMP, F-91191 Gif Sur Yvette, France

来源：

ACTA MATERIALIA | 1999年 / 47卷 / 06期

关键词：

atom probe; computer simulation; phase transformations; ordering; nucleation; growth;

D O I：

10.1016/S1359-6454(99)00054-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Ordering and phase separation in Ni-Cr-Al alloys were studied using Monte Carlo (MC) simulation and three-dimensional atom probe. Excellent agreement was found. Simulation showed that. (i) in the gamma' phase, Cr substitutes for both Al and Ni sublattices; (ii) in the gamma phase, a "Ni3Cr"-type and an Ll(2)-type short range order (SRO) develop, and transient Al-rich Ll(2) ordered zones exist. In low supersaturated alloy a nucleation and growth mechanism was observed. Simulations indicated that phase transformation occurred in three stages: I-SRO develops: a "Ni3Cr"-type and an Ll(2)-type; II-formation of Al enriched and ordered zones; III-growth and coarsening of gamma' particles. Simulations of high supersaturated alloys showed that a high density of Ll(2) ordered zones nucleates before unmixing. (C) 1999 Acta Metallurgica Inc. Published by Elsevier Science Ltd. All rights received.

引用

页码：1889 / 1899

页数：11

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