High-strong-ductile magnesium alloys by interactions of nanoscale quasi-long period stacking order unit with twin  

作　　者：Lutong Zhou Tingting Niu Guodong Zou Huhu Su Suyun He Shijian Zheng Yulong Zhu Peng Chen Carlos Fernandez Qiuming Peng 

机构地区：[1]State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao,066004,PR China [2]School of Materials Science and Engineering,Hebei University of Technology,Tianjin,300401,PR China [3]Key Laboratory of Automobile Materials of Ministry of Education&School of Materials Science and Engineering,Nanling Campus,Jilin University,Changchun 130025,PR China [4]School of Pharmacy and life sciences,Robert Gordon University,Aberdeen,AB107GJ,UK

出　　处：《Journal of Magnesium and Alloys》2024年第12期4953-4965,共13页镁合金学报(英文)

基　　金：financial support from National Natural Science Foundation of China(52171126,51971194,52202374 and 52331003);“S&T Program of Hebei”(236Z1020G);the Natural Science Foundation of Hebei Province(E2022203167,E2023203255 and C2022203003);Ministry of Education Yangtze River Scholar Professor Program(T2020124)。

摘　　要：Magnesium alloys with high strength in combination of good ductility are especially desirable for applications in transportation,aerospace and bio-implants owing to their high stiffness,abundant raw materials,and environmental friendliness.However,the majority of traditional strengthening approaches including grain refining and precipitate strengthening can usually prohibit dislocation movement at the expense of ductility invariably.Herein,we report an effective strategy for simultaneously enhancing yield strength(205 MPa,2.41 times)and elongation(23%,1.54 times)in a Mg-0.2Zn-0.6Y(at.%)alloy at room temperature,based on the formation of a nanosized quasi-long period stacking order unit(QLPSO)-twin structure by ultrahigh-pressure treatment followed by annealing.The formation reason and strong-ductile mechanism of the unique QLPSO-twin structure have been clarified by transmission electron microscopy observations and molecule dynamics simulations.The improved strength is mainly associated with the presence of nanosized QLPSO and the modified∠86.3oQLPSO-twin boundary(TB)interface,effectively pinning dislocation movement.Comparatively,the enhanced ductility is related to the∠3.7oQLPSO-TB interface and micro-kinks of nanoscale QLPSO,providing some paths for plastic deformation.This strategy on the QLPSO-twin structure might provide an alternative perspective for designing innovative hexagonal close-packed structural materials with superior mechanical properties.

关 键 词：QLPSO Twin boundary Molecule dynamics High resolution TEM 

分 类 号：TG146.22[一般工业技术—材料科学与工程]