摘要
在300~400℃、0.003~1 s^(-1)变形条件下,采用Gleeble-1500型热模拟试验机对Mg-8Al-1Zn-1Y镁合金进行热压缩实验。依据加工硬化率曲线拐点特征构建了合金热变形过程中的动态再结晶临界应变模型,并根据临界条件构建了合金的动态再结晶动力学模型,并分析了不同变形条件对合金动态再结晶的影响。结果表明:变形温度和应变速率对Mg-8Al-1Zn-1Y镁合金的热变形行为有显著的影响,其流变曲线表现出典型的动态再结晶特征,并且提高变形温度和降低应变速率都将促进动态再结晶的发生;在本实验条件下,Mg-8Al-1Zn-1Y镁合金的加工硬化率曲线均具有拐点特征,得到了合金在变形温度为300~400℃及应变速率为0.003~1 s^(-1)条件下所对应的临界应变ε_(c)和峰值应变ε_(p),并获得了合金临界应变模型和动态再结晶动力学模型,合金显微组织特征验证了所获得的临界应变模型和动态再结晶模型的准确性。
Hot compression test of Mg-8Al-1Zn-1Y magnesium alloy was carried out with Gleeble-1500 thermal simulation testing machine under the deformation conditions of deformation temperature of 300-400℃and strain rate of 0.003-1 s^(-1).The critical strain model of dynamic recrystallization in the process of hot deformation of the alloy was constructed according to the inflection characteristics of the work hardening rate curve,and the dynamic recrystallization dynamic model of the alloy was constructed according to the critical conditions.The effects of different deformation conditions on the dynamic recrystallization of the alloy were analyzed.The results show that deformation temperature and strain rate have significant effects on the hot deformation behavior of the Mg-8Al-1Zn-1Y magnesium alloy,and its flow curve shows typical dynamic recrystallization characteristics.Increasing deformation temperature and decreasing strain rate will promote the occurrence of dynamic recrystallization.Under the conditions of this experiment,the work hardening rate curves of the Mg-8Al-1Zn-1Y magnesium alloy all have the characteristics of inflection points.The critical strain and peak strain corresponding to the alloy at the deformation temperature of 300-400℃and the strain rate of 0.003-1 s^(-1) are obtained,and the alloy critical strain model and dynamic recrystallization dynamics model are obtained.The alloy microstructure characteristics verify the accuracy of the obtained critical strain model and dynamic recrystallization model.
作者
王健
李全安
陈晓亚
梅婉婉
陈培军
谭劲峰
WANG Jian;LI Quan-an;CHEN Xiao-ya;MEI Wan-wan;CHEN Pei-jun;TAN Jin-feng(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology,Luoyang 471023,China;Longmen Laboratory,Luoyang 471023,China;Luoyang Shengya Magnesium Alloy Science and Technology Co Ltd,Luoyang 471921,China;CHINALCO Luoyang Copper Co Ltd,Luoyang 471003,China)
出处
《材料热处理学报》
CAS
CSCD
北大核心
2023年第4期177-186,共10页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(52201119)
中原英才计划—中原青年拔尖人才(豫组通〔2021〕44号)
河南省自然科学基金(222300420435)。
