Effect of minor content of Gd on the mechanical and degradable properties of as-cast Mg-2Zn-xGd-0.5Zr alloys

被引：0

作者：

Junxiu Chen ^{[1
,2
]}

Lili Tan ^{[1
]}

Xiaoming Yu ^{[1
]}

Ke Yang ^{[1
]}

机构：

[1] Institute of Metal Research,Chinese Academy of Sciences

[2] School of Materials Science and Engineering,University of Science and Technology of China

来源：

JournalofMaterialsScience&Technology | 2019年 / 35卷 / 04期

关键词：

Mg-2Zn-0.5Zr-Gd allo; Microstructure; Mechanical properties; Biodegradation;

D O I：

暂无

中图分类号：

R318.08 [生物材料学]; TG146.22 [];

学科分类号：

0805 ; 080501 ; 080502 ;

摘要：

RE-containing Mg alloys used as biodegradable medical implants exhibit good promising application due to their good mechanical properties and degradation resistance. In this work, effect of Gd on the microstructure, mechanical properties and biodegradation of as-cast Mg-2Zn-xGd-0.5Zr alloys was investigated. The results showed that there were mainly α-Mg, I-phase, W-phase and MgZn2 phase in Mg-Zn-Gd-Zr alloys. With increase of the Gd content, the strength of the alloys was enhanced due to the second phase strengthening and grain refinement. The degradation resistance of Mg-2Zn-0.5Zr alloy was increased by adding 0.5%–1% Gd due to the uniformly distributed second phases which acted as a barrier to prevent the pitting corrosion. However, increasing Gd content to 2% reduced the degradation resistance of the alloy due to the galvanic corrosion between the matrix and the second phases.The good degradation resistance and mechanical properties of as-cast Mg-2Zn-1Gd-0.5Zr alloy makes it outstanding for biomaterial application.

引用

页码：503 / 511

页数：9