Achieving Ultrahigh Strength in Mg-1.2Y-1.2Ni(at.%)Alloy via Tailoring Extrusion Rate  

作　　者：Xiaoqing Liu Xianke Zhang Jinwei Gao Xiurong Zhu Lei Xiao Zhengchi Yang Lijun Tan Chubin Yang Biao Wu Huixin Chen Jiayu Huang 

机构地区：[1]School of Physics and Electronics,Gannan Normal University,Ganzhou 341000,China [2]Jiangxi Provincial Engineering Research Center for Magnesium Alloys,Gannan Normal University,Ganzhou 341000,China [3]School of Materials Science and Engineering,Fuzhou University,Fuzhou 350108,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2025年第2期299-312,共14页金属学报(英文版)

基　　金：the financial support from the National Natural Science Foundation of China(No.12164004);the Jiangxi Provincial Natural Science Foundation(Nos.20242BAB25210,20232BCJ25067,20232BAB214004 and 20224BAB204029);the Foundation of Education Department of Jiangxi Provincial(Nos.GJJ2201247 and GJJ211436);the Young and Middle-aged Teachers Education Scientific Research Project of Fujian Province(No.JAT231008);supported by Sinoma Institute of Materials Research(Guang Zhou)Co.,Ltd(SIMR).

摘　　要：Mg-1.2Y-1.2Ni(at.%)alloy was extruded at 400℃with an extrusion ratio of 16:1 and different rates from 1 to 6 mm/s.The effect of extrusion rate on microstructure and mechanical properties of the Mg-1.2Y-1.2Ni alloy was systematically investigated.With the increase of extrusion rate,the average recrystallized grain size of Mg-1.2Y-1.2Ni alloy and mean particle diameter of Mg2Ni phase were increased,while the density of geometrically necessary dislocation and the intensity of the basal texture were decreased.When extrusion rate increases from 1 to 6 mm/s,the tensile yield strength(TYS)of asextruded Mg-1.2Y-1.2Ni alloy decreases from 501 to 281 MPa,while the elongation to failure increases from 1.5%to 6.2%.The Mg-1.2Y-1.2Ni alloy extruded at 3 mm/s obtained TYS of 421 MPa,the ultimate tensile strength(UTS)of 440 MPa and elongation to failure of 2.6%,respectively,exhibiting comprehensive mechanical properties with relatively good plasticity and ultrahigh strength.The ultrahigh TYS of 501 and 421 MPa was mainly due to the strengthening from ultrafine recrystallized grains,high volume fraction long period stacking ordered(LPSO)phases and high density dislocations.

关 键 词：Wrought Mg-Y-Ni alloy Ultrahigh strength Microstructure Extrusion rate 

分 类 号：TG1[金属学及工艺—金属学]