Effect of forced-air cooling on the microstructure and age-hardening response of extruded Mg-Gd-Y-Zn-Zr alloy full with LPSO lamella  

作　　者：S.Z.Wu T.Nakata G.Z.Tang C.Xu X.J.Wang X.W.Li X.G.Qiao M.Y.Zheng L.Geng S.Kamado G.H.Fan 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China [2]Research Center for Advanced Magnesium Technology,Nagaoka University of Technology,Nagaoka 940-2188,Japan [3]School of Material Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China [4]Key Laboratory for Light-weight Materials,Nanjing Tech University,Nanjing 211816,China

出　　处：《Journal of Materials Science & Technology》2021年第14期66-75,共10页材料科学技术（英文版）

基　　金：financially supported by the National Natural Science Foundation for Young Scientists of China(Nos.51801042 and 51704088);the National Natural Science Foundation(Nos.51971075 and 51775150);the Fundamental Research Funds for the Central Universities;the JST Advanced Low Carbon Technology Research;the Development Program(ALCA)(No.12102886)。

摘　　要：The homogenized Mg-8.2 Gd-3.8 Y-1.0 Zn-0.4 Zr(wt.%)alloy full of plate-shaped long period stacking ordered(LPSO)phases was hot extruded in the atmosphere and cooled by the forced-air,then the effect of forced-air cooling on the microstructure and age-hardening response of the alloy was investigated in this work.The results show that in comparison with the extruded sample cooling in the atmosphere,the forced-air cooling restricts dynamic recrystallization(DRX)and brings about finer dynamic recrystallized(DRXed)grain size,stronger basal texture and higher dislocation density.Furthermore,the forced-air cooling promotes the dynamic precipitation in the DRXed regions and facilitates formation of plate-shaped LPSO phases andγ’phases with smaller interspacing in the unrecrystallized(un DRXed)regions,then slightly restricts the precipitation ofβphases during aging.After peak-ageing treatment,the extruded sample with forced-air cooling shows superior tensile properties with a tensile yield strength of 439 MPa,an ultimate tensile strength of 493 MPa,and elongation to failure of 18.6%.

关 键 词：Mg-RE alloy LPSO phase Dynamic recrystallization Precipitation Mechanical properties 

分 类 号：TG146.22[一般工业技术—材料科学与工程]