长期中子辐照Al-Mg-Si合金的压缩力学行为

胡凌 郑航 冯琦杰 周韦 叶想平 卢磊

胡凌, 郑航, 冯琦杰, 周韦, 叶想平, 卢磊. 长期中子辐照Al-Mg-Si合金的压缩力学行为[J]. 爆炸与冲击, 2019, 39(12): 123101. doi: 10.11883/bzycj-2018-0483
引用本文: 胡凌, 郑航, 冯琦杰, 周韦, 叶想平, 卢磊. 长期中子辐照Al-Mg-Si合金的压缩力学行为[J]. 爆炸与冲击, 2019, 39(12): 123101. doi: 10.11883/bzycj-2018-0483
HU Ling, ZHENG Hang, FENG Qijie, ZHOU Wei, YE Xiangping, LU Lei. Mechanical behavior of long-term neutron-irradiated Al-Mg-Si alloy under compression[J]. Explosion And Shock Waves, 2019, 39(12): 123101. doi: 10.11883/bzycj-2018-0483
Citation: HU Ling, ZHENG Hang, FENG Qijie, ZHOU Wei, YE Xiangping, LU Lei. Mechanical behavior of long-term neutron-irradiated Al-Mg-Si alloy under compression[J]. Explosion And Shock Waves, 2019, 39(12): 123101. doi: 10.11883/bzycj-2018-0483

长期中子辐照Al-Mg-Si合金的压缩力学行为

doi: 10.11883/bzycj-2018-0483
基金项目: 科学挑战专题(TZ2018001)
详细信息
    作者简介:

    胡 凌(1982- ),男,硕士,研究实习员,huling@ustc.edu

  • 中图分类号: O341

Mechanical behavior of long-term neutron-irradiated Al-Mg-Si alloy under compression

  • 摘要: 利用材料试验机及分离式霍普金森压杆装置,开展长期中子辐照后的Al-Mg-Si合金(反应堆内实际服役近30年的LT21铝合金)在不同温度和应变率下压缩力学行为的实验研究,获得了实验温度、应变率对其屈服强度及流动应力的影响规律。结果表明:材料在一定的温度区间(−40~300 ℃)和应变率区间(0.001~3 000 s−1)内,分别呈现出较为明显的温度效应与正应变率效应;其中在较低的温度(−80~−40 ℃)和较高的应变率(3 000~5 000 s−1)区间力学性能受温度和应变率变化的影响较小;当温度升至300 ℃时,材料的塑性变形行为已趋于理想塑性流动。根据前述实验结果,计及材料内部的微观辐照缺陷对力学性能的影响,建立了考虑辐照损伤的Zerilli-Armstrong本构模型,模型的计算结果与前述实验结果吻合较好。结合文献中高纯铝的微观辐照缺陷的演化数据,对不同快中子辐照剂量LT21铝合金的屈服强度,以及另两个来自反应堆内不同受辐照区域试样在不同应变率和温度下的屈服强度进行了计算。上述研究表明,本文建立的考虑辐照损伤的Z-A本构方程不仅能较好地反映长期中子辐照后的Al-Mg-Si合金宏观应力和应变、应变率、温度等参数的关系,也能针对位错运动及辐照硬化机制进行较好地描述,并且能够为反应堆内相应结构元件的设计、运行和安全评估提供一定的参考。
  • 图  1  EBSD获得的服役30年的LT21铝合金晶体取向成像图

    Figure  1.  Inverse pole figure map of decommissioned LT21 aluminum alloy obtained from EBSD characterization

    图  2  准静态条件下材料的真应力-真应变曲线

    Figure  2.  Quasi-static compressive true stress-strain cruves at different temperatures

    图  3  准静态下材料流动应力随温度变化曲线

    Figure  3.  Quasi-static flow stress as a function of temperature at different strains

    图  4  常温时不同应变率下材料的真应力-真应变曲线

    Figure  4.  True stress-strain curves under different strain-rate compression at room temperature

    图  5  图5动态压缩下材料流动应力随应变率变化曲线

    Figure  5.  Dynamic flow stress as a function of strain rate at different strains

    图  6  考虑辐照损伤的Z-A本构模型计算结果与实验结果对比

    Figure  6.  Comparison between experimental results and modified Zerilli-Armstrong model prediction

    图  7  高纯铝内部的辐照缺陷的(Nd0)0.5值与快中子通量的关系(E>0.1 MeV)

    Figure  7.  (Nd0)0.5 as a function of fast neutron fluence in high-purity Al (E>0.1 MeV)

    图  8  本构模型中σ0σY的值随快中子通量的变化关系(E>0.1 MeV)

    Figure  8.  σ0/σY as a function of fast neutron fluence (E>0.1 MeV)

    图  9  三个典型受辐照区域试样的屈服强度及随应变率以及温度的变化

    Figure  9.  Yield strength of three samples from typical irradiated regions as a function of strain rate and temperature

    表  1  被辐照LT21铝合金主要化学元素成分的质量分数

    Table  1.   Mass fraction of mian chemical elements in irradiated LT21 aluminum alloy

    主要元素MgSiFeMnAl
    质量分数0.69%0.68%0.013%
    下载: 导出CSV

    表  2  考虑辐照损伤的Z-A本构模型参数

    Table  2.   Parameters for the modified Zerilli-Armstrong model

    σ0/MPaB/MPaβ1β0A/MPaα1α0
    40.00148.580.000 1270.002 86237.8380.000 1010.001 52
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-11-30
  • 修回日期:  2019-05-24
  • 网络出版日期:  2019-11-25
  • 刊出日期:  2019-12-01

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