Grain refinement and high thermal stability in laser surface remelted Mg-4Y-3Nd-1.5Al alloy. (1st January 2023)

• Record Type: Journal Article
• Authors: Wang, Lei; Liu, Dong-Rong; Chen, Tian; Wang, Shaofan; Cao, Yang
• Is Part Of: Scripta materialia. Number 222(2023)
• Publication Date: 2023-01-01
• Subjects: Magnesium alloys -- Grain refining -- Rapid solidification -- Solidification microstructure -- Hardness; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2022.115000
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: 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 Al2 RE particles and interdendritic eutectic Al2 RE 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 °C for 30 h by Zener pinning mechanism. Graphical abstract: Image, graphical abstract