Transactions of Materials and Heat Treatment

Title：Influence of rolling deformation on fragmentation of S phase in Al-Zn-Mg-Cu alloy

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ClassificationCode：TG339

year,vol(issue):pagenumber：2022,47(1):124-131

Abstract：

In view of the problems of difficulty for crushing the coarse S phase (Al2CuMg) in Al-Zn-Mg-Cu alloy by the traditional symmetric rolling method, according to the force characteristics of the snake rolling deformation zone, the stress in the region with the least force in the deformation zone was analyzed by the principal stress method, and the micro finite element model of coarse S phase deformation of 7055 aluminum alloy during the snake rolling process was established. Then, the strains of S phase in the 7055 aluminum alloy during the symmetric rolling, asynchronous rolling and snake rolling processes were simulated by the established finite element model, and the rolling experiment and S phase morphology observation were carried out to verify the diagnostic accuracy of the finite element model. The results show that the micro finite element model is accurate and reliable. With the increasing of asymmetric factors, the fragmentation degrees of S phase in the core of sheet increases, namely, snake rolling>asynchronous rolling>symmetric rolling. In addition, the S phase on the surface layer of sheet during the snake rolling has greater strain and are more severely broken than that of the core.

Funds：

国家自然科学基金资助项目(51764043，11762014)；内蒙古自治区科技创新引导项目(KCBJ2018017)；内蒙古自治区高等学校“青年科技英才支持计划”(NJYT20A16)；内蒙古自治区留学回区人员科技活动项目；内蒙古自然科学基金（2020MS05061）

作者简介：李小刚（1993-），男，硕士 E-mail：1753531985@qq.com 通信作者：闫亮明（1979-），男，博士，教授 E-mail：yanliangming@126.com

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