摘要
在Gleeble-1500D热模拟机上对纳米SiCp/Al复合材料试样进行了单向热压缩试验,研究其在变形温度为460~520℃、应变速率为0.1~5 s-1条件下的高温变形行为。根据实验数据绘制出纳米SiCp/Al复合材料的真应力-真应变曲线,利用双曲正弦函数模型构建纳米SiCp/Al复合材料的应变补偿本构方程,并通过误差分析对该应变补偿本构方程的准确性进行验证。结果表明:纳米SiCp/Al复合材料的流变应力曲线均呈现出先升高至峰值随后缓慢下降的趋势,流变应力随着变形温度的升高和应变速率的降低而减小;在本文试验条件下纳米SiCp/Al热变形激活能的平均值为278.79 kJ/mol;通过应变补偿本构方程得到的流变应力预测值与试验值的线性相关系数为0.991,平均相对误差为2.05%。
The unidirectional hot compression test of nano-SiCp/Al composites was carried out on the Gleeble-1500 D thermal simulator.The deformation behavior at high temperature of the composites was studied under the conditions of deformation temperature of 460-520℃and strain rate of 0.1-5 s-1.According to the experimental data,the true stress-true strain curves of the nano-SiCp/Al composites were plotted,and the strain compensation constitutive equation of the nano-SiCp/Al composites was established by hyperbolic sine function model,the accuracy of the strain compensation constitutive equation was verified by error analysis.The results show that the flow stress curves of the nano-SiCp/Al composites show a trend of first increasing to peak value and then decreasing slowly,and the flow stress decreases with the increase of deformation temperature and the decrease of strain rate.Under the experimental conditions,the average activation energy of hot deformation of the nano-SiCp/Al composites is 278.79 kJ/mol.The linear correlation coefficient between the predicted flow stress obtained by strain compensation constitutive equation and the test value is 0.991,and the average relative error is 2.05%.
作者
王震
王爱琴
谢敬佩
WANG Zhen;WANG Ai-qin;XIE Jing-pei(College of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Collaborative Innovation Center of Nonferrous Materials of Henan Province,Luoyang 471023,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2019年第6期162-169,共8页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51771070)
