Density gradient segregation of Cu at the Si2Hf/Al interface in an Al-Si-Cu-Hf alloy

被引：4

作者：

Jia, Zhihong ^{[1
,2
]}

Xing, Yuan ^{[2
,3
]}

Ning, Yaru ^{[1
]}

Ding, Lipeng ^{[1
]}

Hao, Longlong ^{[2
]}

Liu, Qing ^{[1
]}

机构：

[1] Nanjing Tech Univ, Key Lab Light weight Mat, Nanjing 210009, Peoples R China

[2] Chongqing Univ, Sch Mat Sci & Engn, Chongqing 400044, Peoples R China

[3] State Key Lab Comprehens Utilizat Vanadium & Titan, Panzhihua 617000, Peoples R China

来源：

SCRIPTA MATERIALIA | 2023年 / 222卷

基金：

中国国家自然科学基金;

关键词：

Aluminum; Precipitates; Interfacial segregation; HAADF-STEM; Density functional theory; MECHANICAL-PROPERTIES; MG; ZR; MICROSTRUCTURE; SILVER; ATOMS; TI;

D O I：

10.1016/j.scriptamat.2022.115022

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Solute segregation at the Si2Hf/Al interface of an Al-Si-Cu-Hf alloy was investigated by combining high angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray spectroscopy (EDS) and density functional theory (DFT) calculation. Density gradient segregation of Cu atoms was observed at the habit plane of the nanobelt-like Si2Hf phase, with the Cu concentrations gradually increasing to the Si2Hf/Al interface. This gradient segregation of Cu is found to be beneficial for decreasing both the strain and interfacial energies and thereby promoting the stabilization of the Si2Hf precipitates during heat treatment. This study provides an insight into the enhanced stability of Si2Hf precipitates in Al-Si-Cu-Hf alloy.

引用

页数：6

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