Microstructural characterization of laser micro-welded Nitinol wires

Peng Dong; Hongmei Li; Wenxian Wang; Jun Zhou

doi:10.1016/j.matchar.2017.11.022

Microstructural characterization of laser micro-welded Nitinol wires

Peng Dong, Hongmei Li, Wenxian Wang, Jun Zhou

School of Engineering (Behrend)

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

Laser micro-welding has been considered one of the most promising joining methods of manufacturing Nitinol biomedical devices. However, there is still a lack of understanding about how laser micro-welding influences the microstructure. This work attempts to reveal the phase content within various microstructural zones of laser micro-welded crossed Nitinol wires by transmission electron microscopy (TEM) with the assistance of the focused ion beam (FIB) technique. The base metal is composed of a single austenite phase (B2). The fusion zone exhibits the coexistence of austenite matrix and several intermetallics (T₂Ni, TiNi₃ and Ti₃Ni₄). The precipitation of R-phase was observed in HAZ with B2 matrix due to thermally induced stresses during welding.

Original language	English (US)
Pages (from-to)	40-45
Number of pages	6
Journal	Materials Characterization
Volume	135
DOIs	https://doi.org/10.1016/j.matchar.2017.11.022
State	Published - Jan 2018

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.matchar.2017.11.022

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title = "Microstructural characterization of laser micro-welded Nitinol wires",

abstract = "Laser micro-welding has been considered one of the most promising joining methods of manufacturing Nitinol biomedical devices. However, there is still a lack of understanding about how laser micro-welding influences the microstructure. This work attempts to reveal the phase content within various microstructural zones of laser micro-welded crossed Nitinol wires by transmission electron microscopy (TEM) with the assistance of the focused ion beam (FIB) technique. The base metal is composed of a single austenite phase (B2). The fusion zone exhibits the coexistence of austenite matrix and several intermetallics (T2Ni, TiNi3 and Ti3Ni4). The precipitation of R-phase was observed in HAZ with B2 matrix due to thermally induced stresses during welding.",

author = "Peng Dong and Hongmei Li and Wenxian Wang and Jun Zhou",

note = "Funding Information: This work was supported by the National Natural Science Foundation of China (No. 51675365 ) and the Basic Application Research Project of Shanxi Province (No. 201701D221138 ). Publisher Copyright: {\textcopyright} 2017 Elsevier Inc.",

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AU - Dong, Peng

AU - Li, Hongmei

AU - Wang, Wenxian

AU - Zhou, Jun

N1 - Funding Information: This work was supported by the National Natural Science Foundation of China (No. 51675365 ) and the Basic Application Research Project of Shanxi Province (No. 201701D221138 ). Publisher Copyright: © 2017 Elsevier Inc.

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N2 - Laser micro-welding has been considered one of the most promising joining methods of manufacturing Nitinol biomedical devices. However, there is still a lack of understanding about how laser micro-welding influences the microstructure. This work attempts to reveal the phase content within various microstructural zones of laser micro-welded crossed Nitinol wires by transmission electron microscopy (TEM) with the assistance of the focused ion beam (FIB) technique. The base metal is composed of a single austenite phase (B2). The fusion zone exhibits the coexistence of austenite matrix and several intermetallics (T2Ni, TiNi3 and Ti3Ni4). The precipitation of R-phase was observed in HAZ with B2 matrix due to thermally induced stresses during welding.

AB - Laser micro-welding has been considered one of the most promising joining methods of manufacturing Nitinol biomedical devices. However, there is still a lack of understanding about how laser micro-welding influences the microstructure. This work attempts to reveal the phase content within various microstructural zones of laser micro-welded crossed Nitinol wires by transmission electron microscopy (TEM) with the assistance of the focused ion beam (FIB) technique. The base metal is composed of a single austenite phase (B2). The fusion zone exhibits the coexistence of austenite matrix and several intermetallics (T2Ni, TiNi3 and Ti3Ni4). The precipitation of R-phase was observed in HAZ with B2 matrix due to thermally induced stresses during welding.

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Microstructural characterization of laser micro-welded Nitinol wires

Abstract

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