Shrinked bifilms in Mg-Gd-Y-Zr alloy

被引：2

作者：

Song, Heqian ^{[1
,2
]}

Zhang, Lunyong ^{[1
,2
]}

Ning, Zhiliang ^{[1
,2
]}

Wang, Yufeng ^{[3
]}

Yi, Junying ^{[4
]}

Cao, Fuyang ^{[1
,2
]}

Sun, Jianfei ^{[1
,2
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Heilongjiang, Peoples R China

[2] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China

[3] Tianjin Inst Aerosp Electromech Equipment, Tianjin 300458, Peoples R China

[4] Jiangsu Univ Sci & Technol, Sch Met & Mat Engn, Zhangjiagang 215600, Peoples R China

来源：

MATERIALS LETTERS | 2022年 / 306卷

基金：

中国国家自然科学基金;

关键词：

Cast; Defects; Microstructure; Oxidation;

D O I：

10.1016/j.matlet.2021.130906

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Mg-Gd-Y-Zr alloy has excellent mechanical properties at room and high temperatures, but its high oxidation properties can also result in a significant number of bifilm defects. However, its formation mechanism was not revealed so far, which was explored in the present work. The results showed that the surface oxide film folds into a grid-like double layer structure defect during solidification, due to the difference of thermal expansion coefficient between surface oxide film and matrix. In addition, the oxide film produces microcracks. As the magnesium alloy melt fills the crack, Zr precipitates into crystal nucleus with peritectic reaction and Y2O3 accumulates. These results would shed new lights on the understanding of shrinkage formation of bifilm defects and improving the defects control of magnesium alloy castings.

引用

页数：4

共 13 条

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