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利用纳米压痕技术研究了{[(Fe0.6Co0.4)0.75B0.2Si0.05]0.96Nb0.04}96Cr4铁基块体非晶合金的室温蠕变行为及不同的加载速率对该块体非晶合金蠕变变形的影响.{[(Fe0.6Co0.4)0.75B0.2Si0.05]0.96Nb0.04}96Cr4铁基块体非晶合金的室温蠕变变形与加载速率密切相关:在3—24mN/s加载速率下表现出显著的蠕变变形;随着加载速率的减小,蠕变变形逐渐变小,当加载速率为1mN/s和0.75mN/s时,蠕变变形基本消失.采用elastic-viscoelastic-viscous(EVEV)模型对该铁基块体非晶合金的蠕变变形进行了模拟.结果表明:EVEV模型能很好地模拟实验数据(相关系数R达到0.9392),并得到了与该块体非晶合金内部结构有关的蠕变柔量和延迟谱.基于室温蠕变速率敏感指数(m)的分析和纳米压痕的原子力显微镜(AFM)观测,细致讨论了{[(Fe0.6Co0.4)0.75B0.2Si0.05]0.96Nb0.04}96Cr4铁基块体非晶合金的室温蠕变机制.
The room temperature creep behavior of {[(Fe0.6Co0.4) 0.75B0.2Si0.05] 0.96Nb0.04} 96Cr4 iron-based bulk amorphous alloys at room temperature and the effect of different loading rates on the bulk ([Fe0.6Co0.4) 0.75B0.2Si0.05] 0.96Nb0.04} room temperature creep deformation of 96Cr4 iron-based bulk amorphous alloy is closely related to the loading rate The creep deformation shows remarkable creep deformation under the loading rate of 3-24mN / s. With the decrease of the loading rate, the creep deformation becomes smaller. When the loading rates are 1mN / s and 0.75mN / s, the creep deformation basically disappears The elastic-viscoelastic-viscous (EVEV) model was used to simulate the creep deformation of the iron-based bulk amorphous alloy.The results show that the EVEV model can well simulate the experimental data (the correlation coefficient R reaches 0.9392) The creep compliance and delay profile related to the internal structure of the bulk amorphous alloy were discussed in detail. Based on the analysis of creep rate sensitivity index (m) at room temperature and atomic force microscopy (AFM) Fe0.6Co0.4) 0.75B0.2Si0.05] 0.96Nb0.04} 96Cr4 iron-based bulk amorphous alloys at room temperature creep mechanism.