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- Title
Effects of Al and Y Addition on Microstructures and Mechanical Properties of As‐Cast Mg–14Li Based Alloy.
- Authors
Gao, Zhankui; Liu, Wencai; Wu, Guohua; Zhang, Liang; Ji, Hao; Ouyang, Sijie; Peng, Xiang; Xiao, Lv; Ding, Wenjiang
- Abstract
In this study, effects of Al and Y contents on microstructural evolutions and mechanical properties of the as‐cast Mg–14Li alloy are investigated. The results show that Mg–14Li–xAl (x = 1, 2, 3 wt%) alloys are characterized by predominantly single β–Li and MgLiAl2 phases. Slight refinement of β–Li grains is obtained with the increasing of Al content. The increased Al addition greatly improves the hardness, ultimate tensile strength, and yield strength of the Mg‐14 base alloy, accompanied by a significant reduction in ductility. Meanwhile, with addition of minor Y (0.5 wt%) addition leads to the introduction of homogeneous distribution of Al2Y particles in the Mg–14Li–3Al alloy, which plays a positive role in the strength enhancement. However, the uneven distribution of apparently coarsed Al2Y particles contributes to a significant reduction in tensile strength as the Y content is increased up to 1 wt%. In the alloy of Mg–14Li–3Al–0.5Y, β–Li phases are dramatically spheroidized after addition of surface‐active element Y. Round‐like Al2Y phases locate along grain boundaries. And considerable secondary crack sources initiate both at grain interiors and along grain boundaries and propagate with a combination of inter‐granular and trans‐granular way.
- Subjects
MICROSTRUCTURE; MECHANICAL behavior of materials; MAGNESIUM alloys
- Publication
Advanced Engineering Materials, 2019, Vol 21, Issue 2, pN.PAG
- ISSN
1438-1656
- Publication type
Article
- DOI
10.1002/adem.201800755