Microstructure, Mechanical Properties and Tribological Behavior of Two-Phase Mg–Y–Cu Alloys with Long Period Stacking Ordered Phases

• Published in: Metals and materials international 2021, 27(6), , pp.1605-1612
• Main Authors: Zhang, L., Huang, H., Zhang, S. J., Liu, X. R.
• Format: Article
• Language: English
• Subjects: Alloys; Casting alloys; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coefficient of friction; Copper; Engineering Thermodynamics; Grain size; Hardness; Heat and Mass Transfer; Machines; Magnesium; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Mechanical properties; Metallic Materials; Microstructure; Processes; Solid Mechanics; Solid phases; Stacking; Tensile strength; Tribology; Ultimate tensile strength; Wear rate; Wear resistance; 재료공학
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-019-00578-8

This study is undertaken to investigate the microstructure, mechanical properties and tribological behavior of as-cast Mg 100−3 x Y 2 x Cu x (at%, x  = 0.5, 1, 1.5 and 2) alloys. The results show that all the alloys had a two-phase structure consisting of α-Mg matrix and 18R long period stacking ordered phase. With increasing Y and Cu contents, the average grain size of primary α-Mg gradually decreased from 1280 to 146 μm, meanwhile, the volume fraction of long period stacking ordered phase rapidly increased from 11.8 to 56.4%. As Y and Cu contents increased, the tensile strength and hardness of as-cast alloys were gradually enhanced. The yield strength, ultimate tensile strength and hardness of the Mg 94 Y 4 Cu 2 alloy were 188 MPa, 252 MPa and 86.7 HB respectively, which were increased by 144.2%, 78.7% and 20.2% compared with the Mg 98.5 Y 1 Cu 0.5 alloy. The friction coefficient and the wear rate of as-cast alloys decreased firstly and then increased as Y and Cu contents increased. The Mg 95.5 Y 3 Cu 1.5 alloy exhibited the lowest friction coefficient and the best wear resistance. Graphic Abstract