Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8462
Title: Susceptibility to environmentally induced cracking of laser-welded NiTi wires in Hanks' solution at open-circuit potential
Authors: Chan, CW
Man, HC 
Yue, TM 
Keywords: Hydrogen embrittlement
Nanoindentation
Shape memory alloys
Strain measurement
Welding
Issue Date: 2012
Publisher: Elsevier
Source: Materials science and engineering. A, Structural materials : properties, microstructure and processing, 2012, v. 544, p. 38-47 How to cite?
Journal: Materials science and engineering. A, Structural materials : properties, microstructure and processing 
Abstract: In the present study the tensile and super-elastic behaviours of laser-welded NiTi wires in Hanks' solution at open-circuit potential (OCP) were investigated using tensile and cyclic slow-strain-rate tests (SSRT). In comparison with NiTi weldment tested in oil (non-corrosive environment), the weldment in Hanks' solution suffered from obvious degradation in the tensile properties as evidenced by lower tensile strength, reduced maximum elongation, and a brittle fracture mode. Moreover, a larger residual strain was observed in the weldment after stress-strain cycles in Hanks' solution. In addition to the microstructural defects resulting from the welding process, the inferior tensile and super-elastic behaviours of the NiTi weldment in Hanks' solution could be attributed to the trapping of a large amount of hydrogen in the weld zone and heat-affected zone.
URI: http://hdl.handle.net/10397/8462
ISSN: 0921-5093
EISSN: 1873-4936
DOI: 10.1016/j.msea.2012.02.087
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