In Situ SEM Torsion Test of Metallic Glass Microwires Based on Micro Robotic Manipulation

Author:

Jiang Chenchen12,Lu Haojian1,Cao Ke1,Wan Wenfeng1,Shen Yajing13ORCID,Lu Yang12ORCID

Affiliation:

1. Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong Kong

2. Center for Advanced Structural Materials (CASM), Shenzhen Research Institute, City University of Hong Kong, Shenzhen 518057, China

3. Centre for Robotics and Automation, Shenzhen Research Institute, City University of Hong Kong, Shenzhen 518057, China

Abstract

Microwires, such as metallic, semiconductor, and polymer microwires and carbon fibers, have stimulated great interest due to their importance in various structural and functional applications. Particularly, metallic glass (MG) microwires, because of their amorphous atoms arrangement, have some unique mechanical properties compared with traditional metals. Despite the fact that substantial research efforts have been made on the mechanical characterizations of metallic glass microwires under tension or flexural bending, the mechanical properties of microwires under torsional loading have not been well studied, mainly due to the experimental difficulties, such as the detection of torsion angle, quantitative measurement of the torsional load, and the alignment between the specimen and torque meter. In this work, we implemented the in situ SEM torsion tests of individual La50Al30Ni20 metallic glass (MG) microwires successfully based on a self-developed micro robotic mechanical testing system. Unprecedented details, such as the revolving vein-pattern along the torsion direction on MG microwires fracture surface, were revealed. Our platform could provide critical insights into understanding the deformation mechanisms of other microwires under torsional loading and can even be further used for robotic micromanufacturing.

Funder

Research Grants Council of the Hong Kong Special Administrative Region

Publisher

Hindawi Limited

Subject

Instrumentation,Atomic and Molecular Physics, and Optics

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