摘要
镁合金被广泛应用于材料科学、航空航天及军事装备等领域。实验发现,镁合金材料在动态加载下的力学响应与介观尺度不连续动态再结晶紧密相关。为此,构建了镁合金动态再结晶的相场模型,以AZ31B镁合金为研究对象,模拟了不同温度(250~400℃)、低应变率(0.01~1.00 s^(-1))加载下的不连续动态再结晶演化过程。再结晶相场模型耦合了塑性应变,实现了应力-应变曲线与再结晶组织演化的迭代求解。模拟发现,再结晶晶粒的体积分数和平均晶粒尺寸随温度的升高而明显增大,随应变率的增大而减小。
Magnesium is widely used for materials science,aerospace,and military equipment.It is found that the mechanical property of magnesium under deformation loading is closely related to discontinuous dynamic recrystallization.In this work,we construct a dynamic recrystallization phenomenological model of magnesium alloy via phase-field methods.We choose AZ31B magnesium alloy as the research object and simulate grains and grain boundaries evolutions during dynamic recrystallization under 0.01-1.00 s^(-1) and 250-400℃.Iterative solving methods of stress-strain curves and recrystallization evolutions are improved by introducing plastic deformation energy to phase-field model.The simulation results show the volume fraction of recrystallization grains and the average grain size of samples increase with the rise of temperature and decrease of strain rates.
作者
许可
盛杰
刘瑜
黄厚兵
施小明
宋海峰
XU Ke;SHENG Jie;LIU Yu;HUANG Houbing;SHI Xiaoming;SONG Haifeng(School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China;Advanced Research Institute of Multidisciplinary Sciences,Beijing Institute of Technology,Beijing 100081,China;Laboratory of Computational Physics,Institute of Applied Physics and Computational Mathematics,Beijing 100094,China;School of Mathematics and Physics,University of Science and Technology Beijing,Beijing 100083,China)
出处
《高压物理学报》
CAS
CSCD
北大核心
2024年第3期49-58,共10页
Chinese Journal of High Pressure Physics
基金
国家科技部重点研发计划(2021YFB3501503)
国家自然科学基金(U2230401)
计算物理全国重点实验室基金。
关键词
相场模拟
镁合金
动态再结晶
力学响应
phase-field simulations
magnesium alloy
dynamic recrystallization
mechanical response
