A 12R long-period stacking-ordered structure in a Mg-Ni-Y alloy  

作　　者：Cheng Liu Yuman Zhu Qun Luo Bin Liu Qinfen Gu Qian Li 

机构地区：[1]State Key Laboratory of Advanced Special Steels,Shanghai Key Laboratory of Advanced Ferrometallurgy,School of Materials Science and Engineering,Shanghai Institute of Materials Genome,Materials Genome Institute,Shanghai University,Shanghai 200444,China [2]Department of Materials Science and Engineering,Monash University,Victoria 3800,Australia [3]Australian Synchrotron,Clayton 3168,Australia

出　　处：《Journal of Materials Science & Technology》2018年第12期2235-2239,共5页材料科学技术（英文版）

基　　金：financially supported by the National Natural Foundation China(51671118);the Science and Technology Commission of Shanghai Municipality(16520721800 and 16DZ2260601);Young Elite Scientists Sponsorship Program By CAST(2017QNRC001);the “111” projects(D16002 and D17002);Program for Professor of Special Appointment(Eastern Scholar)by Shanghai Municipal Education Commission(No.TP2015040)

摘　　要：A hitherto unreported long-period stacking-ordered(LPSO) phase, designated 12 R, was observed in a Mg80Ni5Y15(at.%) alloy. Microstructure was investigated by electron diffraction and high-angle annular dark-field scanning transmission electron microscopy. Results show that the 12 R has a trigonal lattice(a = b = 1.112 nm, c = 3.126 nm, α = β = 90°, and γ = 120°). Unit cell of the 12 R is consisted of three ABCAtype building blocks and each building block contains dominant Ni6Y8-type building clusters. A sound structural model is proposed based on relative positions of Ni6Y8clusters in neighboring building blocks.A hitherto unreported long-period stacking-ordered(LPSO) phase, designated 12 R, was observed in a Mg_(80)Ni_5Y_(15)(at.%) alloy. Microstructure was investigated by electron diffraction and high-angle annular dark-field scanning transmission electron microscopy. Results show that the 12 R has a trigonal lattice(a = b = 1.112 nm, c = 3.126 nm, α = β = 90°, and γ = 120°). Unit cell of the 12 R is consisted of three ABCAtype building blocks and each building block contains dominant Ni_6 Y_8-type building clusters. A sound structural model is proposed based on relative positions of Ni_6 Y_8 clusters in neighboring building blocks.

关 键 词：Mg alloys LPSO HAADF-STEM Crystal structure 

分 类 号：TG[金属学及工艺]