Journal
MATERIALS LETTERS
Volume 330, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2022.133218
Keywords
Mg alloy; Additive manufacturing; Laser deposition manufacturing; Friction stir processing; Microstructure
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In this study, friction stir processing (FSP) was used to improve the microstructure and eliminate pore defects of WE43 magnesium alloy fabricated by laser deposition manufacturing (LDM).
WE43 magnesium alloy fabricated by laser deposition manufacturing (LDM) has broad application prospects in aerospace fields. In this paper, the friction stir processing (FSP) of the deposited zone (DZ) is used to improve the microstructure and eliminate pore defects of the LDMed WE43 alloy. In the DZ, the matrix phase is alpha-Mg with Zr-rich phases inside, and the inter-dendritic eutectic structure is composed of Mg12Nd and Mg24Y5 phases. After FSP, the inter-dendritic eutectic structure was broken, and the Zr-rich phases were finer and diffusely distributed in the alpha-Mg matrix; the porosity was decreased from 1.4% in the DZ to 0.04%. The grain size was reduced by 86% compared to the DZ, which promotes the increase of microhardness.
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