Hot deformation behavior and microstructure evolution of Mg-Gd-Sm(-Zn)-Zr alloys  

作　　者：Aowen Wang Xiaoya Chen Quanan Li Zheng Wu Limin Zhu Hongxi Zhu Huanju He 

机构地区：[1]School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China [2]Provincial and Ministerial Co-Construction of Collaborative Innovation Center for Non-Ferrous Metal New Materials and Advanced Processing Technology,Luoyang 471023,China [3]Longmen Laboratory,Luoyang 471000,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2025年第5期1162-1175,共14页矿物冶金与材料学报(英文版)

基　　金：supported by the National Natural Science Foundation of China(Nos.52201119 and 52371108);the Frontier Exploration Project of Longmen Laboratory,China(No.LMQYTSKT014);the 12th Postgraduate Innovation Fund of Henan University of Science and Technology(No.CXJJ-2023-KJ04).

摘　　要：The dynamic recrystallization(DRX)and dynamic precipitation of Mg-5Gd-3Sm(-1Zn)-0.5Zr alloys after hot compression deformation were analyzed by electron backscatter diffraction(EBSD)and transmission electron microscopy(TEM)techniques.Further-more,the DRX mechanisms were investigated by calculating the deformation activation energy,establishing the constitutive equation,and creating a critical strain model.The results indicate that the presence of Zn element enhanced the production of DRX,considerably re-duced the strength of{0001}plane texture,and boosted the Schmidt factor of nonbasal plane slip.The Mg-5Gd-3Sm-0.5Zr alloy had a low degree of DRX,manifested as a monolayer of DRX grains at the grain boundaries,and dominated by the discontinuous DRX mech-anism.However,the Mg-5Gd-3Sm-1Zn-0.5Zr alloy had a high degree of DRX,which occurred in the form of multilayered DRX grains by the main mechanism of continuous DRX.Compared with the Mg-5Gd-3Sm-0.5Zr alloy,in addition to the Mg5(Gd,Sm)phase,the Mg-5Gd-3Sm-1Zn-0.5Zr alloy also introduced a new dynamic precipitation phase called(Mg,Zn)_(3)(Gd,Sm)phase.The dynamic precip-itation phase prevented grain boundary migration and dislocation motion,which promoted DRX nucleation and prevented the growth of recrystallized grains.

关 键 词：magnesium alloy constitutive equation hot working diagram dynamic recrystallization dynamic precipitation 

分 类 号：TG146.22[一般工业技术—材料科学与工程]