Mechanical and microstructural integrity of nickel-titanium and stainless steel laser joined wires

被引：57

作者：

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

Bornert, M. ^{[4
]}

Bidaux, J. -E. ^{[5
]}

Bataillard, L. ^{[6
]}

Karimi, A. ^{[3
]}

Drezet, J. -M. ^{[2
]}

Rappaz, M. ^{[2
]}

Hessler-Wyser, A. ^{[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

[3] Ecole Polytech Fed Lausanne, Inst Phys Matiere Condensee, CH-1015 Lausanne, Switzerland

[4] Univ Paris Est, Ecole Ponts Paris Tech, Lab Navier, F-77455 Marne La Vallee, France

[5] Univ Appl Sci Western Switzerland, CH-1950 Sion, Switzerland

[6] Heraeus Med Components Div, CH-1400 Yverdon, Switzerland

来源：

ACTA MATERIALIA | 2011年 / 59卷 / 17期

关键词：

Shape memory alloys (SMA); Laser welding; Tension testing; Stainless steel; Fracture; MEDICAL APPLICATIONS; PHYSICAL METALLURGY; ALUMINUM-ALLOY; NITINOL; NI; TI;

D O I：

10.1016/j.actamat.2011.06.031

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The biomedical industry shows increasing interest in the joining of dissimilar metals, especially with the aim of developing devices that combine different mechanical and corrosive properties. As an example, nickel titanium shape memory alloys joined to stainless steel are very promising for new invasive surgery devices, such as guidewires. A fracture mechanics study of such joined wires was carried out using in situ tensile testing and scanning electron microscopy imaging combined with chemical analysis, and revealed an unusual fracture behaviour at superelastic stress. Nanoindentation was performed to determine the mechanical properties of the welded area, which were used as an input for mechanical computation in order to understand this unexpected behaviour. Automated image correlation allowed verification of the mechanical modelling and a reduced stress strain model is proposed to explain the special fracture mechanism. This study reveals the fact that tremendous property changes at the interface between the NiTi base wire and the weld area have more impact on the ultimate tensile strength than the chemical composition variation across the welded area. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：6538 / 6546

页数：9

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