Facile and cost-effective approach to additively manufacture crack-free 7075 aluminum alloy by laser powder bed fusion

Li，Gan1,2; Ruan，Gang1,2; Huang，Yuhe1,2; Xu，Zhen1,2; Li，Xinwei3; Guo，Chuan1,2; Zhao，Chunlu4; Cheng，Le1,2; Hu，Xiaogang1,2; Li，Xinggang1,2,5; Zhu，Qiang1,2

2022-12-20

10.1016/j.jallcom.2022.167097

JOURNAL OF ALLOYS AND COMPOUNDS   影响因子和分区

0925-8388

1873-4669

It is an often challenging but essential issue to develop a facile and cost-effective approach to additively manufacture crack-free and high-strength Al alloys for their wider commercial applications. However, efficient synergistic combination of advanced technology and material development is hardly likely to achieve without considering the extreme processing conditions during additive manufacturing. In this study, the addition of 4 wt% Ti-6Al-4V (TC4) alloy powders, the most commercially used Ti alloy powders, into the laser powder bed fusion (L-PBF) of 7075 Al alloy was performed and experimentally verified to be capable of eliminating the hot cracks while substantially refining the grains. The as-printed sample was crack-free and had a high relative density of up to 99.95%. Synergy effect of the in-situ formation of Al(Ti,V) particles that act as the heterogeneous nucleation sites, and the solute effect of the elements Ti and V that possess a high grain growth restriction factor (Q value) in Al matrix can efficiently control the grain growth. After a direct ageing treatment, the resultant alloy displayed an excellent combination of the high ultimate tensile strength (441 ± 3 MPa) and large plasticity (10.1 ± 0.4%). Our work brings new insights between the grain refinement and crack elimination of additively manufactured Al alloys through addition of commercial Ti alloys, benefiting the tailoring and development of new crack-free and dense high-strength Al alloys for L-PBF.

7075 aluminum alloy Additive manufacturing Grain refinement Laser powder bed fusion Ti-6Al-4V alloy

SCI

英语

第一 ; 通讯

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

Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering

Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000859168200001

ELSEVIER SCIENCE SA

MATERIALS SCIENCE

2-s2.0-85138066477

Scopus

1.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
2.Shenzhen Key Laboratory for Additive Manufacturing of High-performance Materials,Southern University of Science and Technology,Shenzhen,518055,China
3.Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,518060,China
4.Jiangxi Baohang Advanced Materials Co.,Ltd,Nanchang,330224,China
5.Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,518055,China

Li，Gan,Ruan，Gang,Huang，Yuhe,et al. Facile and cost-effective approach to additively manufacture crack-free 7075 aluminum alloy by laser powder bed fusion[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2022,928.

Li，Gan.,Ruan，Gang.,Huang，Yuhe.,Xu，Zhen.,Li，Xinwei.,...&Zhu，Qiang.(2022).Facile and cost-effective approach to additively manufacture crack-free 7075 aluminum alloy by laser powder bed fusion.JOURNAL OF ALLOYS AND COMPOUNDS,928.

Li，Gan,et al."Facile and cost-effective approach to additively manufacture crack-free 7075 aluminum alloy by laser powder bed fusion".JOURNAL OF ALLOYS AND COMPOUNDS 928(2022).