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.
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)
