Elucidating the evolution of long-period stacking ordered phase and its effect on deformation behavior in the as-cast Mg-6Gd-1Zn-0.6Zr alloy  

作　　者：Sangwon Lee Yejun Park Jongbin Go Young Mok Kim Seok Su Sohn Jiehua Li Pyuck-Pa Choi 

机构地区：[1]Department of Materials Science and Engineering,Korea Advanced Institute of Science and Technology(KAIST),Daejeon,34141,Republic of Korea [2]Department of Materials Science and Engineering,Kyoto University,Kyoto,606-8501,Japan [3]Department of Materials Science and Engineering,Korea University,Seoul,02841,Republic of Korea [4]Institute of Casting Research,Montanuniverstät Leoben,Leoben,A-8700,Austria

出　　处：《Journal of Magnesium and Alloys》2023年第8期2801-2810,共10页镁合金学报（英文）

基　　金：This work was supported by the National Research Foundation of Korea(Grant number:NRF-2019K1A3A1A18116059 and NRF-2023R1A2C200529811);Austrian Science Fund(FWF)(P 32378-N37);Federal Ministry of Austria Education,Science and Research(BMBWF)(KR 06/2020).

摘　　要：Herein,the evolution of long-period stacking ordered(LPSO)phases in the as-cast Mg-6Gd-1Zn-0.6Zr(wt.%)alloy are investigated via transmission electron microscopy(TEM)and atom probe tomography(APT).The TEM results reveal that two types of LPSO phase(a bulky interdendritic phase and a plate-like matrix LPSO phase)are formed in the as-cast sample.Most of the LPSO phases are confirmed to be of the 14H type,with a smaller proportion being of the 18R LPSO.Further,the APT results reveal that the composition of the interdendritic LPSO phase is closer to that of the ideal 14H phase compared to the matrix LPSO phase,and both the interdendritic and matrix LPSO phases exhibit a Gd/Zn ratio of 2.5,thereby indicating a deficient Zn content compared to the ideal 14H phase(i.e.,1.3).In addition,the influence of the LPSO phases on the deformation behavior is investigated at different compressive plastic strains using electron backscatter diffraction(EBSD)analysis to reveal twinning and slip behavior during deformation.The results indicate that the LPSO phase induces additional work hardening in the late stage of deformation via the suppression of{1011}compressive twinning and the activation of non-basal slip systems.

关 键 词：Magnesium alloy Long-period stacking ordered phase Transmission electron microscopy Atom probe tomography Work hardening behavior 

分 类 号：TG146.22[一般工业技术—材料科学与工程]