Enhanced combination of strength and ductility in the semi-solid rheocast hypereutectic Al-Si alloy with the effect of in-situ TiB2 particles

被引：27

作者：

Ma, Guodong ^{[1
]}

Li, Lu ^{[1
,2
]}

Xi, Shuaiying ^{[1
]}

Xiao, Ying ^{[1
]}

Li, Yongkun ^{[3
]}

Yuan, Zhentao ^{[1
]}

He, Yuanhuai ^{[1
]}

Zhou, Rongfeng ^{[1
,2
]}

Jiang, Yehua ^{[1
]}

机构：

[1] Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China

[2] Kunming Univ Sci & Technol, Res Ctr Anal & Measurement, Kunming 650093, Yunnan, Peoples R China

[3] Kunming Univ Sci & Technol, Fac Mech & Elect Engn, Kunming 650093, Yunnan, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2021年 / 176卷

基金：

中国国家自然科学基金;

关键词：

Hypereutectic Al-Si alloy; TiB2p; Interface; Dislocation; Fracture behavior; Strength-ductility synergy; MECHANICAL-PROPERTIES; EUTECTIC SI; MICROSTRUCTURE; NUCLEATION; PHASE; REFINEMENT; COMPOSITE; BEHAVIOR; ENERGY;

D O I：

10.1016/j.matchar.2021.111143

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This study aims to address the issues of low strength and high brittleness associated with common industrial hypereutectic aluminum alloys. We report here that the addition of TiB2 particles (TiB2p) not only enhances the strength of the rheocast hypereutectic Al-17Si alloy, but also exerts a positive effect on its ductility. As the content of TiB2p reaches 6 wt%, the strength and ductility of composites are increased by 63.4% and 62%, respectively (UTS = 283.3 MPa, and EL = 1.62% in this study). The EBSD results show that the densities of low-angle and high-angle grain boundaries increase with the content of TiB2p. The interfaces of TiB2p/Si and TiB2p/Al are investigated by TEM, HRTEM, and an atomic structure model simulation. A model addressing dislocation multiplication, and crack initiation and propagation is developed to elaborate the strength-ductility synergy mechanisms of the TiB2p/Al-17Si composite.

引用

页数：13

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