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金属学报  2020, Vol. 56 Issue (5): 785-794    DOI: 10.11900/0412.1961.2019.00299
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李源才, 江五贵(), 周宇
南昌航空大学航空制造工程学院 南昌 330063
Effect of Temperature on Mechanical Propertiesof Carbon Nanotubes-Reinforced Nickel Nano-Honeycombs
LI Yuancai, JIANG Wugui(), ZHOU Yu
School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China
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关键词 纳米蜂窝镍碳纳米管增强纳米蜂窝镍力学性能分子动力学温度效应    

Nickel nano-honeycombs (NNHC) would be expected to an ideal anode material for solid oxide fuel cells (SOFC) because of its high surface area and highly ordered pore network. But, the anode material requires excellent mechanical properties to withstand stresses that arise during processing and service at different temperatures. The influence of temperature on the mechanical behaviors under radial (y axis) tension, radial compression, axial (z axis) tension and axial compression, is investigated by molecular dynamics (MD) by taking the carbon nanotubes (CNT)-reinforced NNHC (CRNNHC) composites with the mass fractions of CNT (ωCNT) of 5.22‰ and its corresponding NNHC as the example. The results show that the mechanical properties including elastic modulus(E) and ultimate stress (σu)in NNHC and CRNNHC both decrease approximately linearly with the increase of temperature. Compared to NNHC, the addition of CNT has no obvious effect on the enhancement of radial mechanical properties of CRNNHC under different temperatures, but it results in a good reinforced effect on axial mechanical properties. While the axial tensile and compressive elastic moduli can be increased by 6.4%~10% and 9%~12% respectively, and the ultimate stress can be increased by 1.5%~5.3% and 10%~14% respectively. The study indicates that axial mechanical properties of the CRNNHC are generally superior to their radial mechanical properties, and the energy absorption before the axial deformation is relatively larger due to the existence of CNT.

Key wordsnickel nano-honeycomb (NNHC)    CNT-reinforced NNHC (CRNNHC)    mechanical property    molecular dynamics    temperature effect
收稿日期: 2019-09-10     
ZTFLH:  TB31  
通讯作者: 江五贵     E-mail:
Corresponding author: JIANG Wugui     E-mail:
作者简介: 李源才,男,1987年生,硕士生


李源才, 江五贵, 周宇. 温度对碳纳米管增强纳米蜂窝镍力学性能的影响[J]. 金属学报, 2020, 56(5): 785-794.
Yuancai LI, Wugui JIANG, Yu ZHOU. Effect of Temperature on Mechanical Propertiesof Carbon Nanotubes-Reinforced Nickel Nano-Honeycombs. Acta Metall Sin, 2020, 56(5): 785-794.

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图1  本工作所用分子动力学(MD)模型
图2  不同温度下NNHC和CRNNHC沿径向拉伸的应力-应变曲线
图3  不同温度下NNHC和CRNNHC沿径向拉伸的力学性能
图4  不同温度下NNHC和CRNNHC沿径向压缩的应力-应变曲线
图5  不同温度下NNHC和CRNNHC沿径向压缩的力学性能
图6  不同温度下NNHC和CRNNHC沿轴向拉伸的应力-应变曲线
图7  温度为900 K时CRNNHC沿轴向拉伸原子分布图
图8  不同温度下NNHC和CRNNHC沿轴向拉伸的力学性能
图9  不同温度下轴向压缩应力-应变曲线
图10  不同温度下NNHC和CRNNHC沿轴向压缩的力学性能
图11  温度为600 K时CRNNHC在径向拉伸、径向压缩、轴向拉伸和轴向压缩变形下的原子分布图
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