Quantitative determination of strain fields around Ni4Ti3 precipitates in NiTi

被引：146

作者：

Tirry, W ^{[1
]}

Schryvers, D ^{[1
]}

机构：

[1] Univ Antwerp, Electron Microscopy Mat Sci EMAT, Dept Phys, B-2020 Antwerp, Belgium

来源：

ACTA MATERIALIA | 2005年 / 53卷 / 04期

关键词：

Ni4Ti3; precipitation; NiTi; HREM; strain field; Eshelby model;

D O I：

10.1016/j.actamat.2004.10.049

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-resolution transmission electron microscopy and image-processing techniques are used to measure the strain-fields surrounding coherent Ni4Ti3 precipitates in an austenitic Ni51Ti49 matrix. Images are recorded in the [1 1 (1) over bar](B2) and the [1 0 (1) over bar](B2) zones, and the {1 1 0}(B2) interplanar spacings are used to determine the strain induced by both small (50 nm diameter) and large (300 nm diameter) precipitates. From these observations, the maximum strain in the surrounding matrix is mapped and identified as compressive or tensile. Interactions between strain fields of different precipitates are also investigated. A simple model for the observed strain is proposed and compared to the classical Eshelby solution for an ellipsoidal inclusion. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1041 / 1049

页数：9

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