Three-dimensional chemical analysis of laser-welded NiTi-stainless steel wires using a dual-beam FIB

被引：36

作者：

Burdet, P. ^{[1
]}

Vannod, J. ^{[1
,2
]}

Hessler-Wyser, A. ^{[1
]}

Rappaz, M. ^{[2
]}

Cantoni, M. ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, Ctr Interdisciplinaire Microscopie Elect, CH-1015 Lausanne, Switzerland

[2] Ecole Polytech Fed Lausanne, Lab Simulat Mat, CH-1015 Lausanne, Switzerland

来源：

ACTA MATERIALIA | 2013年 / 61卷 / 08期

关键词：

Intermetallic phases; Laser welding; Focused ion beam (FIB); Energy dispersive X-ray spectrometry (EDS); 3-D image analysis; MICROANALYSIS; IMAGES;

D O I：

10.1016/j.actamat.2013.01.069

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The biomedical industry has an increasing demand for processes to join dissimilar metals, such as laser welding of NiTi and stainless steel wires. A region of the weld close to the NiTi interface, which previously was shown to be prone to cracking, was further analyzed by energy dispersive spectrometry (EDS) extended in the third dimension using a focused ion beam. As the spatial resolution of EDS analysis is not precise enough to resolve the finest parts of the microstructure, a new segmentation method that uses in addition secondary-electron images of higher spatial resolution was developed. Applying these tools, it is shown that this region of the weld close to the NiTi interface does not comprise a homogeneous intermetallic layer, but is rather constituted by a succession of different intermetallics, the composition of which can be directly correlated with the solidification path in the ternary Fe-Ni-Ti Gibbs simplex. (c) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3090 / 3098

页数：9

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