Laser powder bed fusion of crack-free TiN/Al7075 composites with enhanced mechanical properties

被引：40

作者：

Wu, Wenjie ^{[1
]}

Gao, Chaofeng ^{[1
]}

Liu, Zhongqiang ^{[1
]}

Wong, Kaho ^{[2
]}

Xiao, Zhiyu ^{[1
]}

机构：

[1] South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Metall M, Guangdong Prov Key Lab Proc & Forming Adv Metall, Guangzhou 510640, Peoples R China

[2] Guangzhou Zoltrix Hip Mat Ltd, Guangzhou 510640, Peoples R China

来源：

MATERIALS LETTERS | 2021年 / 282卷 / 282期

基金：

中国国家自然科学基金;

关键词：

Laser powder bed fusion; Al7075; Nanoparticles; Crack; Microstructure; Mechanical properties;

D O I：

10.1016/j.matlet.2020.128625

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The manufacturing of 7xxx series wrought aluminum alloys using laser powder bed fusion (LPBF) is restricted due to the inherent low laser absorptivity and high crack sensitivity. In this work, Al7075 composite powders decorated with TiN nanoparticles are produced by an ultrasonic vibration dispersion technique. Results show that the laser reflectivity of the composite powders is notably reduced, leading to improved LPBF processability. Therefore, nearly dense and crack-free TiN/Al7075 composites are successfully fabricated by LPBF. The microstructure of as-built composites is significantly refined after adding TiN nanoparticles, thus inhibiting the crack initiation. The TiN/Al7075 composites exhibit remarkably improved microhardness and compressive properties compared to unreinforced Al7075 alloy. This paper provides a new path in fabricating high-strength aluminum alloys by LPBF. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：4

共 12 条

[1] Microstructure and mechanical properties of a novel Sc and Zr modified 7075 aluminum alloy prepared by selective laser melting [J].