Details

Autor(en) / Beteiligte

• Jiang, S.D.
• Wang, H.
• Huang, Y.J.
• Shen, H.X.
• Xing, D.W.
• Ning, Z.L.
• Sun, J.F.

Titel

Effect of strain rate on tensile behavior in amorphous fibers by an in-situ video extensometer system

Ist Teil von

• Materials science & engineering. A, Structural materials : properties, microstructure and processing, 2020-04, Vol.782, p.139252, Article 139252

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Elsevier ScienceDirect Journals

Beschreibungen/Notizen

• Understanding the relationship between strain rate and deformation behavior in micro-sized amorphous alloys is key to optimizing mechanical properties for emerging flexible skin smart sensors and engineering applications. The tensile behavior of Co68.15Fe4.35Si12.25B15.25 amorphous fiber was investigated over a wide range of strain rate of 5 × 10−5 s−1–1 × 10−1 s−1 at room temperature (RT) by an in-situ video extensometer system. Higher shear strain rate resulted in a hardening effect, thereby facilitating enhanced fracture strength. In contrast, tensile plasticity increased with decreasing strain rate. In comparison, to analyze the strain rate sensitivity, tensile behaviors of Fe75Si10B15 amorphous fiber over different strain rates were also observed. Fracture strength and tensile plasticity were found to be insensitive to strain rate. Pronounced tensile plasticity of up to 1% was observed for Co-rich amorphous fiber at strain rates ≤1.0 × 10−4 s−1, which is attributed to the balance between the generation rate and extinction rate of free volume. The critical shear offset had a significant impact on the plastic deformation of amorphous fibers. A predictive relationship was established between tensile plasticity and measured critical shear offset for Co-rich fiber. •Strain rate sensitivity of tensile behavior for Fe- and Co-rich amorphous fibers was newly reported.•The highest fracture strength is nearly 4854 MPa at 5 × 10-2 s-1 applied strain rate.•Pronounced tensile plasticity up to 1% was observed at the strain rates below 1.0 × 10-4 s-1.•A predictive relationship was established between tensile plasticity and critical shear offset.