Microstructural characterization of laser micro-welded Nitinol wires

Microstructural characterization of laser micro-welded Nitinol wires
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激光微焊接镍钛诺丝的微观结构表征

DOI:
10.1016/j.matchar.2017.11.022
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发表时间:
2018
影响因子:
4.7
通讯作者:
Zhou Jun
Zhou Jun
中科院分区:
材料科学1区
文献类型:
--
作者:
Dong Peng;Li Hongmei;Wang Wenxian;Zhou Jun

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激光微焊被认为是制造镍钛合金生物医用器件最有前途的连接方法之一。然而,激光微细焊接对显微组织的影响还缺乏深入的了解。本工作试图借助聚焦离子束(FIB)技术,用透射电子显微镜(TEM)揭示激光微焊交叉镍钛合金丝各微区中的相含量。母材由单一奥氏体相(B2)组成。熔合区为奥氏体基和多种金属间化合物(T2Ni、TiNi3和Ti3Ni4)共存。在焊接过程中,由于热应力的作用,在B2基热影响区中观察到了R相的析出。
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, TiNi3and Ti3Ni4). The precipitation of R-phase was observed in HAZ with B2 matrix due to thermally induced stresses during welding.
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