Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 848, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2022.143362
Keywords
Magnesium alloys; Laser surface remelting; Secondary phase; Microstructure; Mechanical property
Categories
Funding
- University Innovation Research Group of Chongqing [CXQT20023]
- Natural Science Foundation of Chongqing [cstc2021ycjh-bgzxm0184]
- China Postdoctoral Science Foundation [2021M700555]
- Scientific Reuter Foundation of Chongqing University of Technology [2017ZD35]
- Graduate Student Innovation Program of Chongqing University of Technology [clgycx20203007]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJQN201901127]
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Laser surface remelting (LSR) treatment refined the grains and redistributed the secondary phase of Mg-6.2Y magnesium alloy, resulting in significant improvement of the mechanical properties of the surface.
Laser surface remelting (LSR) was performed on a Mg-6.2Y (at.%) magnesium alloy to enhance mechanical properties of its surface. The results show that both grains and secondary phase were greatly refined by LSR. The epsilon phase (Mg24+xY5) was redistributed from alpha-Mg grain boundaries to interior of the grains. The Y content of epsilon phase decreased from 14.3 to 9.3 at.% due to the LSR. Some metastable Y-rich nano particles were formed on the epsilon phase due to the rapid solidification. Mechanical properties of treated surface were significantly improved due to grain refinement and phase redistribution. Compressive strength of the treated region was increased to 606 MPa and exhibited a moderated ductility compared to the initial material. The increase of ductility by LSR is related to the uniformed redistribution of epsilon phase, which led to a homogeneous distribution of strain.
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