DataVXPhilosophical MagazinePaper
journal article·2019-08-18Open access

Atomic structure of γ″ phase in Mg–Gd–Y–Ag alloy induced by Ag addition

Xuechao Sha, Lirong Xiao, Xuefei Chen, Guangming Cheng, Yandong Yu, Dongdi Yin, Hao Zhou

Philosophical Magazine· Volume 99· Issue 16
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Source abstract

Abstract

Mg–Gd based alloys are typical high strength magnesium alloys owing to their outstanding age hardening behavior. The mechanical strength of aged Mg–Gd alloys is enhanced by high density prismatic-shaped precipitates in Mg matrix. Moreover, the addition of Ag has been found to enhance the strength of Mg–Gd based alloys further by forming a plate-shaped precipitate, named as γ″, on basal planes of Mg. However, the structure of this precipitate is not well understood due to the complex alloying system. In this work, the atomic structure of γ″ phase is investigated using atomic-resolution high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM). Based on the accurate atomic structure from three independent directions, e.g. in [0001]Mg, [2¯110]Mg and [011¯0]Mg zone axes, the unit cell of γ″ is well established. The γ″ phase has a hexagonal structure, and its lattice parameters are a = 0.55 nm and c = 0.42 nm. The orientation relationship between γ″ phase and Mg matrix is (0001)γ″//(0001)Mg and <2¯110>γ″//<1¯010>Mg.
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Research context

Metals & alloys

OpenAlex topics: Magnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties · Microstructure and mechanical properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Beijing Key Lab of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, People’s Republic of China

Nano and Heterogeneous Materials Center, School of Materials Science and Engineer, Nanjing University of Science and Technology, Nanjing, People’s Republic of China

State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, People’s Republic of China

Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, USA

School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin, People’s Republic of China

Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan, People’s Republic of China

Funding

Natural Science Foundation of Heilongjiang Province of China · Harbin Science and Technology Burean · National Natural Science Foundation of China · National Key R&D Program of China

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