A novel strategy to additively manufacture 7075 aluminium alloy with selective laser melting

Tan，Qiyang1; Fan，Zhiqi1; Tang，Xiaoqin1; Yin，Yu1; Li，Gan2; Huang，Danni1; Zhang，Jingqi1; Liu，Yingang1; Wang，Feng3; Wu，Tao3; Yang，Xianliang3; Huang，Han1; Zhu，Qiang2; Zhang，Ming Xing1

2021-07-21

10.1016/j.msea.2021.141638

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING   影响因子和分区

0921-5093

1873-4936

Selective laser melting (SLM) has been successful in fabricating advanced engineering parts with high geometrical complexities. However, some metals or alloys with high strength, low weldability, and large freezing range, such as 7075 aluminium alloy, have low SLM-processability and are hard to be directly SLM-fabricated. Here, we proposed a novel strategy, combining substrate modification and inoculation treatment, to fabricate a crack-free and dense high-strength 7075 alloy using SLM at a broad processing window. Inoculation of the 7075 alloy powder with 1 wt% Ti submicron particles substantially refine the Al grains, effectively increasing the cracking resistance. Furthermore, the SLM substrate was modified, which allows integration of thermal insulation materials, such as vermiculite, to the substrate. As a result, the melt pool cooling rate and thermal gradient during solidification were significantly reduced. This directly led to a reduction in thermal stress within the melt pool. With combination of the substrate modification and Ti inoculation, crack-free, fine-equiaxed microstructure was obtained in the SLM-fabricated 7075 alloy that has the mechanical properties comparable to its wrought counterpart. This strategy can be implemented to SLM of other engineering alloys with low AM processability, providing a foundation for broadening industrial applications of SLM.

Aluminum alloys Grain refinement Mechanical property Microstructure Modelling Selective laser melting

SCI ; EI

英语

其他

Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000672453200002

ELSEVIER SCIENCE SA

20212610570587

Cracks ; Fabrication ; Grain refinement ; High strength alloys ; Melting ; Selective laser melting ; Textures ; Thermal insulation

Heat Insulating Materials:413.2 ; Metallurgy:531.1 ; Aluminum Alloys:541.2 ; Reproduction, Copying:745.2 ; Chemical Operations:802.3

MATERIALS SCIENCE

2-s2.0-85108706440

Scopus

1.School of Mechanical and Mining Engineering,The University of Queensland,St. Lucia,4072,Australia
2.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
3.HBIS Group,Shijiazhuang,050023,China

Tan，Qiyang,Fan，Zhiqi,Tang，Xiaoqin,et al. A novel strategy to additively manufacture 7075 aluminium alloy with selective laser melting[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2021,821.

Tan，Qiyang.,Fan，Zhiqi.,Tang，Xiaoqin.,Yin，Yu.,Li，Gan.,...&Zhang，Ming Xing.(2021).A novel strategy to additively manufacture 7075 aluminium alloy with selective laser melting.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,821.

Tan，Qiyang,et al."A novel strategy to additively manufacture 7075 aluminium alloy with selective laser melting".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 821(2021).