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基于准点缺陷理论探索非晶合金蠕变机制

徐宗睿 郝奇 张浪渟 乔吉超

徐宗睿, 郝奇, 张浪渟, 乔吉超. 基于准点缺陷理论探索非晶合金蠕变机制. 力学学报, 2022, 54(6): 1590-1600 doi: 10.6052/0459-1879-22-059
引用本文: 徐宗睿, 郝奇, 张浪渟, 乔吉超. 基于准点缺陷理论探索非晶合金蠕变机制. 力学学报, 2022, 54(6): 1590-1600 doi: 10.6052/0459-1879-22-059
Xu Zongrui, Hao Qi, Zhang Langting, Qiao Jichao. Probing into the creep mechanism of amorphous alloy based on quasi-point theory. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(6): 1590-1600 doi: 10.6052/0459-1879-22-059
Citation: Xu Zongrui, Hao Qi, Zhang Langting, Qiao Jichao. Probing into the creep mechanism of amorphous alloy based on quasi-point theory. Chinese Journal of Theoretical and Applied Mechanics, 2022, 54(6): 1590-1600 doi: 10.6052/0459-1879-22-059

基于准点缺陷理论探索非晶合金蠕变机制

doi: 10.6052/0459-1879-22-059
基金项目: 国家自然科学基金(51971178)和陕西省杰出青年基金(2021JC-12)资助项目
详细信息
    作者简介:

    乔吉超, 教授, 主要研究方向: 非晶固体的黏弹性力学行为. E-mail: qjczy@nwpu.edu.cn

  • 中图分类号: O344.4

PROBING INTO THE CREEP MECHANISM OF AMORPHOUS ALLOY BASED ON QUASI-POINT THEORY

  • 摘要: 作为典型多体相互作用非平衡体系, 如何明晰非晶合金多场耦合激励下变形机制, 建立非晶合金变形行为、流动特性与微观结构特征本征关联始终是非晶合金力学性能的重要研究内容. 本文以具有显著$ \beta $弛豫行为的La56.16Ce14.04Ni19.8Al10非晶合金作为研究载体, 通过开展宽温度应力窗口蠕变实验, 着重考查了蠕变柔量、准稳态蠕变速率、特征弛豫时间、蠕变应力指数及蠕变激活能演变规律, 系统研究了非晶合金蠕变行为与蠕变机制. 基于准点缺陷理论分析了非晶合金蠕变行为由弹性向黏弹性及黏塑性逐步转变的过程, 从微观结构演化角度构建了非晶合金蠕变行为完整物理图像. 研究结果表明, 非晶合金高温蠕变行为是一典型热力耦合、非线性过程, 其潜在蠕变机制受控于温度、应力与加载时间. 应力较低时, 非晶合金蠕变机制对应于热激活单粒子流动. 应力较高时, 蠕变机制则对应于应力诱导局部剪切变形增强与温度诱导原子扩散等复杂耦合过程. 非晶合金蠕变变形过程所涉及弹塑性转变源于非晶合金准点缺陷激活、微剪切畴经热力耦合激励形核长大、扩展与不可逆融合.

     

  • 图  1  不同温度与应力条件下La56.16Ce14.04Ni19.8Al10非晶合金蠕变曲线

    Figure  1.  Creep curves of La56.16Ce14.04Ni19.8Al10 amorphous alloys at various temperature and stress

    图  2  不同温度与应力条件La56.16Ce14.04Ni19.8Al10非晶合金蠕变柔量演化

    Figure  2.  Variation of creep compliance of La56.16Ce14.04Ni19.8Al10 amorphous alloys at various temperature and stress

    图  3  t = 105 s 时刻, 终态蠕变柔量$ {J}_{{\rm{end}}} $随温度及应力演化

    Figure  3.  Variation of $ {J}_{{\rm{end}}} $ with various temperatures and stress during creep tests at the moment of t = 105 s

    图  4  $ \dot{{\varepsilon }_{s}} $随温度及应力演化

    Figure  4.  Variation of $ \dot{{\varepsilon }_{s}} $ with various temperatures and stress

    图  5  不同温度及应力下La56.16Ce14.04Ni19.8Al10非晶合金特征弛豫时间分布强度谱

    Figure  5.  Characteristic relaxation time distribution of La56.16Ce14.04Ni19.8Al10 amorphous alloys at various stresses and temperature

    图  6  $ \dot{{\varepsilon }_{s}} $与应力相关性, 斜率为应力指数

    Figure  6.  Stress dependence of $ \dot{{\varepsilon }_{s}} $ and the slope denotes the value of stress index

    图  7  $ \dot{{\varepsilon }_{s}} $与温度相关性, 斜率为蠕变激活能

    Figure  7.  Temperature dependence of $ \dot{{\varepsilon }_{s}} $ and the slope denotes the apparent activation energy obtained by Arrhenius equation

    图  8  Gumbel分布示意图

    Figure  8.  Graphic illustration of Gumbel contribution

    图  9  准点缺陷理论描述LaCe基非晶合金的(a)动态弛豫行为与(b)~(d)高温蠕变行为, 其中红色实线为理论预测曲线, 黑色实线为实验数据曲线

    Figure  9.  Description of (a) dynamic relaxation behavior and (b)~(d) high temperature creep behavior of LaCe-based amorphous alloy in the framework of QPD theory. The red line represents the theoretical prediction curve and the black line represents the experimental results

    图  10  蠕变结束时刻, 弹性蠕变柔量、黏弹性蠕变柔量与黏塑性蠕变柔量的温度及应力相关性

    Figure  10.  Temperature and stress dependence of the elastic, viscoelastic and viscoplastic components of the compliance at the end of creep experiments

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出版历程
  • 收稿日期:  2022-01-29
  • 录用日期:  2022-03-23
  • 网络出版日期:  2022-03-24
  • 刊出日期:  2022-06-18

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