Effect of annealing treatment on the microstructure and mechanical properties of warm-rolled Mg-Zn-Gd-Ca-Mn alloys  

作　　者：Yifan Song Xihai Li Jinliang Xu Kai Zhang Yaozong Mao Hong Yan Huiping Li Rongshi Chen 

机构地区：[1]School of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China [2]Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China [3]Shandong Key Laboratory of Advanced Aluminium Materials and Technology,Binzhou Institute of Technology,Binzhou 256606,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2024年第10期2208-2220,共13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.52271107 and 52205392);the Natural Science Foundation of Shandong Province(No.ZR2021ME241);the Bintech-IMR R&D Program(No.GYY-JSBU-2022-012).

摘　　要：The basal texture of traditional magnesium alloy AZ31 is easy to form and exhibits poor plasticity at room temperature.To address these problems,a multi-micro-alloyed high-plasticity Mg-1.8Zn-0.8Gd-0.1Ca-0.2Mn(wt%)alloy was developed using the unique role of rare earth and Ca solute atoms.In addition,the influence of the annealing process on the grain size,second phase,texture,and mechanical properties of the warm-rolled sheet at room temperature was analyzed with the goal of developing high-plasticity mag-nesium alloy sheets and obtaining optimal thermal-mechanical treatment parameters.The results show that the annealing temperature has a significant effect on the microstructure and properties due to the low alloying content:there are small amounts of larger-sized block and long string phases along the rolling direction(RD),as well as several spherical and rodlike particle phases inside the grains.With increas-ing annealing temperature,the grain size decreases and then increases,and the morphology,number,and size of the second phase also change correspondingly.The particle phase within the grains vanishes at 450℃,and the grain size increases sharply.In the full recrystal-lization stage at 300-350℃,the optimum strength-plasticity comprehensive mechanical properties are presented,with yield strengths of 182.1 and 176.9 MPa,tensile strengths of 271.1 and 275.8 MPa in the RD and transverse direction(TD),and elongation values of 27.4%and 32.3%,respectively.Moreover,there are still some larger-sized phases in the alloy that influence its mechanical properties,which offers room for improvement.

关 键 词：Mg-Zn-Gd-Ca-Mn alloy annealing treatment microstructure TEXTURE dynamic recrystallization mechanical properties 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG335[金属学及工艺—金属材料] TG156.2[金属学及工艺—金属学]