Optimizing the Mechanical Properties and Corrosion Performance of Low-Alloyed Mg-Zn-Ca Alloy by Regulating Zn/Ca Atomic Ratios

被引：0
作者：
Jin, Yuan [1 ]
Lyu, Shaoyuan [1 ]
Yu, Qianqian [1 ]
Chen, Minfang [2 ,3 ]
机构：
[1] Tianjin Univ Technol, Sch Mat Sci & Engn, Tianjin 300384, Peoples R China
[2] Minist Educ, Key Lab Display Mat & Photoelect Device, Tianjin 300384, Peoples R China
[3] Natl Demonstrat Ctr Expt Funct Mat Educ, Tianjin 300384, Peoples R China
来源：
SOLIDS | 2025年 / 6卷 / 02期
基金：
中国国家自然科学基金;
关键词：
Mg-Zn-Ca alloy; alloying; mechanical properties; corrosion behavior; HIGH-STRENGTH; AS-CAST; MICROSTRUCTURE; BEHAVIOR; REFINEMENT; MAGNESIUM; ELEMENTS;
D O I：
10.3390/solids6020017
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The microstructural, mechanical and corrosion properties of low-alloyed Mg-Zn-Ca alloys with different Zn/Ca atomic ratios were investigated. The results show that the microstructure of the extruded Mg-1Zn-0.3Ca (ZX1.0) alloy mainly consists of alpha-Mg and Ca2Mg6Zn3 phases and a small amount of Mg2Ca phase. In contrast, the Mg2Ca phase disappears in the alloys Mg-1.4Zn-0.3Ca (ZX1.4), Mg-1.8Zn-0.3Ca (ZX1.8) and Mg-2.3Zn-0.5Ca (ZX2.3). The Ca2Mg6Zn3 phases are mainly distributed along the extrusion direction, showing irregular particle shapes and banded particles. Meanwhile, the grain size of the extruded Mg-Zn-Ca alloy is reduced gradually with the increase of the Zn and Ca contents, decreasing from 1.87 mu m in ZX1.0 to 1.28 mu m in ZX2.3 alloy. Fine grain strengthening and second-phase strengthening increase the yield strength and ultimate tensile strength of the alloy. In addition, when the Zn/Ca ratio is the same, the total elemental content dominates the effect on alloy properties. When increasing the Zn/Ca ratio, the potential difference between Ca2Mg6Zn3 and the Mg matrix increased, resulting in an increase in galvanic corrosion. The negative effect of the volume fraction of the second phase and the positive effect of the fine grain size determine the corrosion performance together. Therefore, ZX1.8 exhibits the best corrosion resistance, of 0.14 mm/y.
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页数：18
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