Chemical Ordering induced Strengthening in Lightweight Mg Alloys

The influence of structure and composition on precipitation phenomena in Al-bearing BCC/HCP Mg alloys are studied via diffusion couple technique. Interdiffusion induced by the resultant composition gradient results in a change in crystal structure from HCP to BCC in the diffusion zone. The Vickers h...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2022-10, Vol.12 (19), p.3488
Main Authors: Duan, Yunnuo, Gao, Qianfeng, Zhang, Zijian, Zhou, Jiali, Li, Yuze, Kou, Zongde, Lan, Si, Tang, Song
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Building materials
Chemical precipitation
Composition
Crystal structure
Crystals
Diamond pyramid hardness
Diffusion
diffusion couple
Ductility
Energy
Interdiffusion
Intermetallic compounds
Magnesium base alloys
Mechanical properties
Mg alloy
ordered phases
phase transformation
Precipitates
precipitation strengthening
Solid solutions
Specialty metals industry
Structure
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Summary:The influence of structure and composition on precipitation phenomena in Al-bearing BCC/HCP Mg alloys are studied via diffusion couple technique. Interdiffusion induced by the resultant composition gradient results in a change in crystal structure from HCP to BCC in the diffusion zone. The Vickers hardness in the diffusion zone is much higher than that in the Mg–5.5at.%Al and Mg–38at.%Li, which is attributed to the chemical ordering by nano-sized secondary ordered D03–Mg3Al precipitation in the BCC Mg–Li–Al diffusion zone. The reasons for different precipitation in Al-bearing Mg alloys with various matrices are discussed. Generating ordered precipitates can be an effective approach to improve both strength and ductility in HCP Mg alloys.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12193488