Stimulated heterogeneous distribution of Sc element and its correlated local hardening effect in Al-Fe-Ni-Sc alloy

被引：14

作者：

Bian, Zeyu ^{[1
,2
]}

Xiao, Yakai ^{[1
,2
]}

He, Lei ^{[1
]}

Liu, Yingtao ^{[1
]}

Chen, Zhe ^{[1
]}

Wang, Mingliang ^{[1
]}

Chen, Dong ^{[2
,3
]}

Wang, Haowei ^{[1
,2
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

[3] Anhui Aluminium Matrix Composites Engn Res Ctr, Huaibei, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2020年 / 771卷

关键词：

Stimulated heterogeneous distribution; Aluminum alloys; Sc element; Hardness; Precipitation; Casting; MECHANICAL-PROPERTIES; CU ALLOYS; PRECIPITATION; ALUMINUM; MICROSTRUCTURE; SCANDIUM; AMBIENT; AL3SC; PARTICLES; STABILITY;

D O I：

10.1016/j.msea.2019.138650

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This work studied the stimulated heterogeneous distribution behavior of Sc element and the correlated local hardening effect in the eutectic Al-Fe-Ni alloy. Through microstructure characterizations, Sc was found to aggregate along grain boundaries, namely eutectic phase free areas. The aggregation behavior made the Sc concentration in eutectic phase free areas reach even twice of nominal addition, which was more uneven than Sc in Al-Sc alloy. Meanwhile, tiny Al grains were induced in eutectic phase free areas when the Sc addition exceeded 0.3 wt%. These stimulated heterogeneous distribution behaviors were attributed to solute redistribution exacerbated by the eutectic structure, and discussed by a modified Schell Equation analytically. Furthermore, nanoindentation tests demonstrated a local hardening behavior correlated with the stimulated heterogeneous distribution of Sc element. Through a quantitatively explanation, it was finally concluded that the inhomogeneous distribution of Sc element can effectively induce the strengthening effect to the eutectic alloy at macro scale.

引用

页数：8

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