首页|晶粒尺寸对竹节晶铜箔微轧制变形行为影响的模拟

晶粒尺寸对竹节晶铜箔微轧制变形行为影响的模拟

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高性能铜箔已经广泛应用于新能源、微电子等领域,为降低其制备成本和调控组织性能,对拉拔-压缩-剪切复合成形条件下的竹节晶铜箔轧制微观变形行为进行研究.建立微观尺度的晶体塑性有限元模型,分析竹节晶微轧制变形的晶粒尺寸效应.该微观模型将每个离散单元只是作为晶粒的组成部分,同时在积分点上采用单晶体本构模型建立本构方程.结果表明:微观层次复合轧制竹节晶铜箔的变形特征表现为高度的异向性和局部化;竹节晶铜箔轧制力变化符合类似Hall-Petch关系,即轧制力随晶粒尺寸的减小而增大;随着晶粒尺寸减小,复合轧制竹节晶铜箔的滑移均匀性和晶界滑移协调能力均增强;动态剪切带和变形带随着晶粒尺寸的减小向晶界偏移.为保证轧制竹节晶铜箔变形的稳定性和进一步减薄,晶粒尺寸小于100 μm为宜.
Simulation of grain size effect on micro-rolling deformation behavior of bamboo crystal copper foil
High performance copper foil is widely used in new energy,microelectronics and other fields.In order to reduce the preparation cost and regulate the microstructure properties,the microscopic deformation behavior of bamboo crystal copper foil rolling under tension-compression-shearing composite forming condition was studied.A microscale finite element model of crystal plasticity was established to analyze the grain size effect of micro-rolling deformation of bamboo crystal copper foil.In microscale,each element represents a part of grain and the constitutive response of an integration point was thus described by the single crystal constitutive model.The results show that,a feature predicted by simulations at the microscale is that the deformation of rolling bamboo crystal copper foil under composite forming condition is highly anisotropic and localization.The change of roll force of rolling bamboo crystal copper foil complies with the Hall-Petch relationship,i.e.the rolling force increases with the decrease of grain size.With the decrease of grain size,the slip uniformity and grain boundary slip coordination ability of the composite rolled bamboo crystal copper foil are enhanced.Dynamic shear and deformation bands offset to grain boundaries with decreasing grain size.The grain size is less than 100 μm in order to ensure the deformation stability and further thinning of rolling bamboo crystal copper foil under composite forming condition.

bamboo crystal rollingcrystal plasticityfinite elementgrain size effectmicro-scale deformation

陈守东、卢日环、陈晨

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铜陵学院 机械工程学院,铜陵 244061

东北大学 轧制技术及连轧自动化国家重点实验室,沈阳 110819

铜陵学院 工程液压机器人安徽普通高校重点实验室,铜陵 244061

燕山大学 国家冷轧板带装备及工艺工程技术研究中心,秦皇岛 066004

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竹节晶轧制 晶体塑性 有限元 晶粒尺寸效应 微观变形

国家自然科学基金国家自然科学基金国家自然科学基金安徽省自然科学基金安徽省高等学校优秀青年人才支持计划安徽省高等学校优秀青年科研项目铜陵学院重点培育资助项目

5180421952005432522044011808085QE161gxyq20220932022AH0301532020tlxyxs33

2024

中国有色金属学报
中国有色金属学会

中国有色金属学报

CSTPCD北大核心
影响因子:1.108
ISSN:1004-0609
年,卷(期):2024.34(3)
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