Al-6.0Mg-0.4Mn-0.15Sc-0.10Zr合金热压缩变形流变应力行为与组织特征  

Flow strain-stress behavior of hot compression deformation and microstructure characteristics of Al-6.0Mg-0.4Mn-0.15Sc-0.10Zr alloy

作　　者：孙黎明 路丽英[2] 付金来 郝思巍[2] 赵伟[2] SUN Li-ming;LU Li-ying;FU Jin-lai;HAO Si-wei;ZHAO Wei(Chongqing Guochuang Advanced Light Alloy Research Institute Co.,Ltd.,Chongqing 400050,China;Northeast Light Alloy Co.,Ltd.,Harbin 150060,China)

机构地区：[1]重庆国创轻合金研究院有限公司,重庆400050 [2]东北轻合金有限责任公司,哈尔滨150060

出　　处：《轻合金加工技术》2022年第9期51-56,共6页Light Alloy Fabrication Technology

摘　　要：通过热压缩模拟实验研究了Al-6.0Mg-0.4Mn-0.15Sc-0.10Zr合金在变形温度为280℃~460℃、应变速率为0.0001s^(-1)~10s^(-1)条件下的流变应力行为及其在热压缩变形过程中的组织演变。基于双曲正弦方程的本构模型描述了流变应力对应变、应变速率和变形温度的依赖关系。结果表明:流变应力随应变速率的增加而增加,随变形温度的升高而降低。温度为350℃、应变速率为0.01s^(-1)时,实验合金发生动态再结晶。在更高的温度和更低的应变速率下,再结晶的体积分数和晶粒尺寸都有增加。基于合金的应力-应变曲线和微观组织演变,实验合金适宜的加工条件是变形温度为400℃~460℃,应变速率为0.01s^(-1)~0.1s^(-1).Flow strain-stress behavior and microstructure evolution of Al-6.OMg-0.4Mn-0.15Sc-0.10Zr alloy during hot compression simulation test is studied.The deformation temperature range is 280℃-460℃ and strain rate range is 0.0001 s^(-1)-10 s^(-1).The constitutive model based on hyperbolic sine equation describes the dependence of flow stress on strain,strain rate and deformation temperature.The constitutive model analysis result shows that flow stress increases with increasing strain rate,whilst decreases with increasing deformation temperature.The dynamic recrystalization occurs under 350℃ and 0.01 s^(-1) deformation conditions.The recrystallization fraction and grain sizes increase with higher deformation temperature and lower strain rate.The appropriate deformation conditions of the experimental alloy is 400℃-460℃ and 0.01 s^(-1)-0.1 s^(-1).

关 键 词：Al-Mg-Mn-Sc-Zr合金 组织特征 流变行为 热压缩变形 

分 类 号：TG146.21[一般工业技术—材料科学与工程]