摘要
晶粒尺寸效应在7075铝合金热变形中的机制尚不明确,难以对其热成形控形控性,严重制约着7075铝合金在新能源汽车复杂薄壁件的工业化应用。提出使用基于位错密度演化的晶体塑性模型,揭示7075铝合金塑性变形中晶粒尺寸效应对变形不均匀协调性的影响,通过不同温度的单向热拉伸实验揭示热流变行为,使用Dream3D软件结合电子背散射衍射技术(EBSD),建立具有真实取向的含有不同晶粒尺寸的准三维RVE(代表性体积元)模型并进行仿真模拟,阐明了晶粒尺寸对7075高强铝合金热拉伸过程中应力应变、位错密度分布的影响。
The mechanism of grain size effect in the hot deformation of 7075 aluminum alloy is still unclear,and it is difficult to control its hot forming shape,which seriously restricts the industrial application of 7075 aluminum alloy in complex thin-walled parts of new energy vehicles.In this paper,it is proposed to use a crystal plasticity model based on dislocation density evolution to reveal the effect of grain size effect on deformation non-uniformity and coordination during plastic deformation of 7075 aluminum alloy,reveal the heat flow behavior through unidirectional hot tensile experiments at different temperatures,and use dream3d software in combination with electron backscatter diffraction(EBSD).A quasi three-dimensional RVE(Representative Volume Element)model with real orientation and different grain sizes was established and simulated to illustrate the effect of grain size on stress-strain and dislocation density distribution of 7075 high strength aluminum alloy during hot drawing.
作者
苏宝毅
郭宁
唐炳涛
郑云龙
SU Baoyi;GUO Ning;TANG Bingtao;ZHENG Yunlong(Faculty of Mechanical Engineering,Qilu University of Technology,(Shandong Academy of Sciences),Jinan 250353,China.)
出处
《齐鲁工业大学学报》
CAS
2023年第1期8-14,62,共8页
Journal of Qilu University of Technology
基金
国家自然科学基金(52105370)
山东省自然科学基金(ZR2020QE168)
齐鲁工业大学(山东省科学院)科教产熔合试点项目基础研究类(2022PY032,2022PT007)。
