摘要
在变形温度250~450℃、变形速率0.005~5 s-1条件下对铸态AZ31B镁合金进行了圆柱体高温压缩实验,研究变形温度、变形速率以及变形程度对变形抗力的影响规律。利用周纪华变形抗力数学模型进行拟合求解,分析影响该模型拟合误差的主要变量并据此提出改进的适用于AZ31B镁合金的变形抗力数学模型。研究结果表明:随着变形程度的增大,AZ31B镁合金材料变形抗力呈先增大后减小直至平衡的变化规律。随着变形温度的降低和变形速率的增大,变形抗力呈增大趋势。周纪华变形抗力模型的拟合相关系数为0.90,模型的平均相对误差为16.3%。变形程度是影响周纪华变形抗力模型拟合精度的主要因素,据此提出的改进的周纪华变形抗力模型的拟合相关系数为0.96,平均相对误差为7.8%,具有较高的预测精度,能够准确地表征AZ31B镁合金变形抗力的变化规律。
Influence of deformation temperature, deformation rate and deformation degree on the deformation resistance of AZ31B magnesium alloy was investigated by compression test at temperature ranging from 250 to 450 ℃ with strain-rate from 0. 005 to 5 s -1. The deformation resistance mathematical model of Zhou Jihua was used to fit the thermal compressive stress-strain data. Analysis of the main factors affecting the model error and then an improved mathematical model of deformation resistance of AZ31B magnesium alloy was put forward. The results shows that： with the increase of the degree of deformation, the deformation resistance of AZ31B magnesium alloy increases at first and then decreases to a balance value. The deformation resistance increases with the decrease of deformation temperature and the increase of the deformation rate. The correlation coefficient of deformation resistance model of Zhou Jihua is O. 90, the average relative error of the model is 16.3%. Deformation degree is the main factor to affect the accuracy of the predicted deformation resistance by the Zhou Jihua＇s model. The fitting correlation coefficient of the improved deformation resistance model of Zhou Jihua is 0.96 and the average relative error is 7.8%. The deformation resistance of AZ31 B magnesium alloy can be accurately characterized by the new model.
作者
王荣军
马立峰
蒋亚平
黄志权
刘光明
楚志兵
林金保
房大庆
WANG Rong-jun MA Li-feng JIANG Ya-ping HUANG Zhi-quan LIU Guang-ming CHU Zhi-bing LIN Jin-bao FANG Da-qing(Taiyuan University of Science and Technology, Heavy Machinery Engineering Research Center of the Ministry Education, Taiyuan 030024, Chin)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2017年第2期168-172,共5页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(U1510131)
山西省"青年三晋学者"
山西省重点研发计划(201603D121010)
晋城市科技计划项目(20155010)
江苏省"双创团队"领军人才项目资助
关键词
AZ31B镁合金
变形抗力
变形程度
拟合精度
AZ31 B magnesium alloy
deformation resistance
deformation degree
fitting accuracy
