Journal
SCRIPTA MATERIALIA
Volume 222, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2022.115000
Keywords
Magnesium alloys; Grain refining; Rapid solidification; Solidification microstructure; Hardness
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Adding low-cost aluminum element to Mg-RE alloy can significantly refine the grain structure in the laser surface remelting process and improve the thermal stability by forming nanoscale intermetallic compounds.
Aluminum is a low-cost alloying element. Adding 1.5 Al (wt.%) to Mg-4Y-3Nd (Mg-RE) alloy leads to a significant grain refinement in the laser surface remelting (LSR) process. The in-situ precipitated Al2RE particles and interdendritic eutectic Al2RE phase formed during the previous solidification turn into a new class of nuclei, and refine the grain structure. The rapid solidification results in the formation of nanoscale Al-RE intermetallic compounds within alloy that ensure excellent thermal stability in grain structure with only 1.85% hardness loss after heat treatment at 545 ? for 30 h by Zener pinning mechanism.
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