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首页> 外文期刊>Materials Science and Engineering >Effect of strain rate on tensile behavior in amorphous fibers by an in-situ video extensometer system
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Effect of strain rate on tensile behavior in amorphous fibers by an in-situ video extensometer system

机译：原位视频引伸计系统对非晶纤维中应变速率的影响

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摘要

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 Co_(68.15)Fe_(4.35)Si_(12.25)B_(15.25) amorphous fiber was investigated over a wide range of strain rate of 5 × 10~(-5) s~(-1)-l × 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 Fe_(75)Si_(10)B_(15) 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.
机译：了解微观尺寸非晶态合金中应变率与变形行为之间的关系，对于为新兴的柔性皮肤智能传感器和工程应用优化机械性能至关重要。研究了Co_（68.15）Fe_（4.35）Si_（12.25）B_（15.25）非晶纤维在5×10〜（-5）s〜（-1）-l×10的宽应变速率下的拉伸行为。通过原位视频引伸计系统在室温（RT）下〜（-1）s〜（-1）。较高的剪切应变速率导致硬化效果，从而促进增强的断裂强度。相反，拉伸塑性随着应变率的降低而增加。相比之下，为了分析应变速率敏感性，还观察到了Fe_（75）Si_（10）B_（15）非晶纤维在不同应变速率下的拉伸行为。发现断裂强度和拉伸可塑性对应变速率不敏感。在应变速率≤1.0×10〜（-4）s〜（-1）时，富钴非晶纤维的拉伸塑性高达1％，这归因于游离自由基的生成速率与消光速率之间的平衡。卷。临界剪切偏移对无定形纤维的塑性变形具有重大影响。在富钴纤维的拉伸塑性和测得的临界剪切偏移之间建立了预测关系。

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