Shock wave induced nanocrystallization during the high current pulsed electron beam process and its effect on mechanical properties

被引：79

作者：

Gao, Bo ^{[1
]}

Xu, Ning ^{[1
]}

Xing, Pengfei ^{[1
]}

机构：

[1] Northeastern Univ, Sch Met, Shenyang 110004, Liaoning, Peoples R China

来源：

MATERIALS LETTERS | 2019年 / 237卷

基金：

中国国家自然科学基金;

关键词：

Shock wave; Nanocrystalline materials; Surfaces; WEAR-RESISTANCE; AL-15SI;

D O I：

10.1016/j.matlet.2018.11.054

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, the effect of high current pulsed beam (HCPEB) treatment induced nanocrystallization via shock waves in the mechanical properties of Al-15Si alloy was studied in detail. First, many fine nanograins formed on the top surface of the HCPEB-treated hypereutectic Al-15Si alloy and showed radial arrangement around the centre of the crater during the HCPEB process as a result of the impact of the shock wave induced by crater eruption. Second, the cross-section analysis revealed that some platelike eutectic Si phases in the heat-affected zone were broken, which was attributed to the repeated impact of the shock wave under high temperature conditions. Third, many nanograins (Al) were formed in the heat-affected zone, which could be tightly related to the shock wave impact during the HCPEB process. Finally, the mechanical properties of the Al-15Si alloy before and after HCPEB treatment were measured, and the results showed that the tensile strength of the HCPEB-treated Al-15Si alloy increased approximately 41.4% from 138.8 MPa for the initial sample to 196.2 MPa for the modified sample. Therefore, HCPEB treatment is a versatile technique for refining the surface microstructure of hypereutectic Al-Si alloys. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：180 / 184

页数：5

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