Scanning transmission electron microscopy and atom probe tomography analysis of non-stoichiometry long-period-stacking-ordered structures in Mg-Ni-Y/Sm alloys

作     者：Yimeng Chen Manuel Legrée Jean-Louis Bobet Alexander Kvit 

作者机构：CAMECA Instruments IncMadisonWI 53711USA ICMCBUniversitéde BordeauxPessacCEDEX 33608France NIAC&Materials Science DepartmentUniversity of WisconsinMadisonWI 53706USA 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2024年第12卷第3期

页      面：954-965页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：the financial support provided by ANR(Project ANR-22-PEHY-0007) DGA(French Direction Générale des Armées,2018600045) Région Nouvelle Aquitaine(agreement 2018–1R10126) 

主　　题：Magnesium alloys Long-range ordering Atom probe tomography(APT) STEM HAADF Hydrolysis properties. 

摘      要：The long-period-stacking-ordered(LPSO)structure affects the mechanical,corrosion and hydrolysis properties of Mg *** current work employs high angle annular dark field-scanning transmission electron microscopy(HAADF-STEM)and atom probe tomography(APT)to investigate the structural and local chemical information of LPSO phases formed in Mg-Ni-Y/Sm ternary alloys after extended isothermal *** on the alloying elements and their concentrations,Mg-Ni-Y/Sm develops a two-phase LPSO+α-Mg structure in which the LPSO phase contains defects,hybrid LPSO structure,and Mg ***-STEM and APT indicate non-stoichiometric LPSO with incomplete Ni_(6)(Y/Sm)_(8) *** addition,the APT quantitatively determines the local composition of LPSO and confirms the presence of Ni within the Mg bonding *** results provide insight into a better understanding of the structure and hydrolysis properties of LPSO-Mg alloys.