摘要
以6082铝合金为研究对象,在Gleeble热模拟实验机上对该合金进行热压缩模拟实验,其变形温度和变形速率的范围分别为300~500℃和0.1~10 s^(-1)。在分析金属高温变形微观机理的基础上,以位错密度变化率为内变量建立了6082铝合金高温变形时的微观组织模型。利用遗传算法确定了模型中的材料参数,并对模型的可靠性进行测试。结果表明:该模型预测精度达5.43%,可较好描述铝合金高温变形过程中的微观组织演变行为。
6082-aluminum alloy was used as research object.The hot compression experiment of the alloy was carried out on Gleeble-3500 simulator.The deformation temperature and strain rate are in the range of 300-500℃and 0.1-10 s^(-1),respectively.Based on the analysis of microscopic high-temperature deformation mechanism,the microstructure model of 6082-aluminum alloy was established by using the rate of dislocation density change as an internal variable.The genetic algorithm was used to determine the material parameters in the model,and the reliability of the model was tested.The results show that the prediction accuracy of the model reaches 5.43%,which can describe the microstructure evolution behavior of aluminum alloy during high-temperature deformation.
作者
李小占
刘萍萍
田世伟
江海涛
LI Xiaozhan;LIU Pingping;TIAN Shiwei;JIANG Haitao(Institute of Engineerin g and Technology,University of Science and Technology Beijing,Beijing 100083,China;National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing,University of Science and Technology Beijing,Beijing 100083,China)
出处
《热加工工艺》
北大核心
2023年第8期26-31,共6页
Hot Working Technology
基金
国家自然科学基金资助项目(52004029)
广西创新驱动发展专项资金项目(GKAA17202008)
山东省自然科学基金项目(ZR.201911180051)。
关键词
铝合金
微观组织
遗传算法
晶粒尺寸
aluminum alloy
microstructure
genetic algorithm
grain size
