Al-Mg-Si-Cu铝合金双道次平面应变热压缩变形中静态软化及再结晶行为  

Static softening and recrystallization behavior of Al-Mg-Si-Cu aluminum alloy during two-pass hot plane strain compression deformation

作　　者：肖罡 李飞龙[4] 郭鹏程 许征兵[3] 李落星[2] XIAO Gang;LI Fei-long;GUO Peng-cheng;XU Zheng-bing;LI Luo-xing(Collaborative Innovation Center of Engineering Technology,Jiangxi University of Applied Science,Nanchang 330100,China;State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body,Hunan University,Changsha 410082,China;Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials,Guangxi University,Nanning 530004,China;Alnan Aluminum Co.,Ltd.,Nanning 530200,China)

机构地区：[1]江西应用科技学院工程技术协同创新中心,江西南昌330100 [2]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082 [3]广西大学广西有色金属及特色材料加工重点实验室,广西南宁530004 [4]南南铝业股份有限公司,广西南宁530200

出　　处：《塑性工程学报》2021年第7期131-137,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金面上资助项目(52075159);中国博士后科学基金面上资助项目(2019M652755);江西省教育厅科学研究项目(GJJ191277,GJJ191283);国家金属材料近净成形工程技术研究中心开放基金资助项目(2020013);广西有色金属及特色材料加工重点实验室开放基金资助项目(2020GXYSOF16)。

摘　　要：为探明铝合金在变形道次间停留时的静态软化机理及其本构关系,采用Gleeble-3500热模拟机研究了Al-Mg-SiCu铝合金在温度为653~733 K、应变速率为0.01~0.1 s^(-1)、道次停留时间为30~240 s变形条件下的流变应力响应行为,并分析了合金的静态软化行为特征,建立了合金在平面应变载荷下的静态再结晶体积分数模型。结果表明:在平面应变热压缩变形初期,Al-Mg-Si-Cu铝合金的流变应力迅速增加,表现出明显的应变硬化,随后在动态回复主导的软化机制作用下逐渐降低,直至饱和。随变形温度的升高和道次停留时间的延长,流变应力减小,表现出明显的软化特征,静态再结晶是道次停留阶段的主导软化机制。结合力学软化法和再结晶动力学模型,建立了基于Avrami方程的静态再结晶体积分数模型,能够对Al-Mg-Si-Cu铝合金在平面应变热变形过程中的静态再结晶行为进行预测。To explore the static softening mechanism and its constitutive relationship of aluminum alloy in interval time of each deformation pass,the flow stress response behavior of Al-Mg-Si-Cu aluminum alloy was investigated by Gleeble-3500 thermal simulator at 653-733 K,strain rate of 0.01-0.1 s^(-1) and interval time of each pass of 30-240 s.The static softening behavior characteristics were analyzed,and static recrystallization volume fraction model under plane strain load was established.The results show that the flow stress of Al-Mg-Si-Cu aluminum alloy increases rapidly at initial stage of hot plane strain compression deformation,showing obvious strain hardening,and then gradually decreases until to saturation under the softening mechanism dominated by dynamic recovery.With the increase of deformation temperature and interval time of each pass,the flow stress decreases,showing obvious softening characteristic.The static recrystallization is the dominant softening mechanism during the interval time of each pass.Combining with the mechanical softening method and recrystallization kinetic model,a static recrystallization volume fraction model based on Avrami equation was established,which can predict the static recrystallization behavior of Al-Mg-Si-Cu aluminum alloy during hot plane strain compression deformation.

关 键 词：Al-Mg-Si-Cu铝合金 热变形 静态软化 再结晶 

分 类 号：TG146[一般工业技术—材料科学与工程]