当前位置: X-MOL 学术Met. Mater. Int. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Microstructure, Mechanical Properties and Tribological Behavior of Two-Phase Mg–Y–Cu Alloys with Long Period Stacking Ordered Phases
Metals and Materials International ( IF 3.3 ) Pub Date : 2020-01-02 , DOI: 10.1007/s12540-019-00578-8
L. Zhang , H. Huang , S. J. Zhang , X. R. Liu

Abstract

This study is undertaken to investigate the microstructure, mechanical properties and tribological behavior of as-cast Mg100−3xY2xCux (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 Mg94Y4Cu2 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 Mg98.5Y1Cu0.5 alloy. The friction coefficient and the wear rate of as-cast alloys decreased firstly and then increased as Y and Cu contents increased. The Mg95.5Y3Cu1.5 alloy exhibited the lowest friction coefficient and the best wear resistance.

Graphic Abstract



中文翻译:

长周期堆积有序相两相Mg-Y-Cu合金的显微组织、力学性能和摩擦学行为

摘要

本研究旨在调查铸态 Mg 100−3 x Y 2 x Cu x (at%, x  = 0.5, 1, 1.5 and 2) 合金的微观结构、机械性能和摩擦学行为。结果表明,所有合金均具有由α-Mg基体和18R长周期堆积有序相组成的两相结构。随着Y和Cu含量的增加,初生α-Mg的平均晶粒尺寸从1280 μm逐渐减小到146 μm,同时长周期堆积有序相的体积分数从11.8%迅速增加到56.4%。随着Y和Cu含量的增加,铸态合金的抗拉强度和硬度逐渐增强。镁合金的屈服强度、极限抗拉强度和硬度94 Y 4 Cu 2合金分别为188 MPa、252 MPa和86.7 HB,比Mg 98.5 Y 1 Cu 0.5合金提高了144.2%、78.7%和20.2% 。随着Y和Cu含量的增加,铸态合金的摩擦系数和磨损率先降低后增加。Mg 95.5 Y 3 Cu 1.5合金表现出最低的摩擦系数和最好的耐磨性。

图形摘要

更新日期:2020-01-02
down
wechat
bug