Laser powder bed fusion of nano-titania modified 2219 aluminium alloy with superior mechanical properties at both room and elevated temperatures: The significant impact of solute

Li，Gan1,2,3,4; Huang，Yuhe3; Li，Xinwei5; Guo，Chuan1,3; Zhu，Qiang3; Lu，Jian1,2,4

2022-12-01

10.1016/j.addma.2022.103296

Additive Manufacturing   Impact Factor & Quartile

2214-8604

2214-8604

There is a strong demand for facile and cost-effective approaches for additive manufacturing (AM) of aluminium (Al) alloy parts with high mechanical properties at both room and elevated temperatures via laser powder bed fusion (L-PBF). Such alloys must be devoid of cracks and large pores while exhibiting excellent mechanical performance. In this study, we demonstrated that the addition of 1 wt% titania (TiO) nanoparticles to a 2219 Al alloy could substantially prevent hot-crack formation during L-PBF by significantly refining grains, which resulted in the formation of a nearly fully dense alloy with a high relative density (99.97%). This pronounced grain refinement was due to the solute effect of the Ti element with a high grain growth restriction factor (Q value) instead of the in-situ formation of lattice-matched L1-ordered AlTi particles. The processed alloy displayed an excellent combination of high ultimate tensile strength and elongation at both room and elevated temperatures, with these properties being comparable to those of its wrought counterpart and greater than those of 2219 Al alloys fabricated via other AM techniques. This low-cost pathway can also be applied to the AM of other Al alloys, which demonstrates its commercial significance.

2219 aluminium alloy Additive manufacturing Grain refinement Laser powder bed fusion Mechanical properties TiO2

SCI

English

Corresponding

Basic and Applied Basic Research Foundation of Guangdong Province[2021A1313110348];National Natural Science Foundation of China[51801096];National Natural Science Foundation of China[52074157];

Engineering ; Materials Science

Engineering, Manufacturing ; Materials Science, Multidisciplinary

WOS:000895043800003

ELSEVIER

2-s2.0-85143158102

Scopus

1.CityU-Shenzhen Futian Research Institute,Shenzhen,518045,China
2.Centre for Advanced Structural Materials,City University of Hong Kong Shenzhen Research Institute,Greater Bay Joint Division,Shenyang National Laboratory for Materials Science,Shenzhen,518057,China
3.Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials,Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Department of Mechanical Engineering,City University of Hong Kong,Kowloon,Hong Kong
5.Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,518060,China

Li，Gan,Huang，Yuhe,Li，Xinwei,et al. Laser powder bed fusion of nano-titania modified 2219 aluminium alloy with superior mechanical properties at both room and elevated temperatures: The significant impact of solute[J]. Additive Manufacturing,2022,60.

Li，Gan,Huang，Yuhe,Li，Xinwei,Guo，Chuan,Zhu，Qiang,&Lu，Jian.(2022).Laser powder bed fusion of nano-titania modified 2219 aluminium alloy with superior mechanical properties at both room and elevated temperatures: The significant impact of solute.Additive Manufacturing,60.

Li，Gan,et al."Laser powder bed fusion of nano-titania modified 2219 aluminium alloy with superior mechanical properties at both room and elevated temperatures: The significant impact of solute".Additive Manufacturing 60(2022).