Achieving high strength-ductility of Al-Zn-Mg-Cu alloys via hot-wire arc additive manufacturing enabled by strengthening precipitates

Fu，Rui1; Lu，Wenjun2; Guo，Yueling1; Lei，Hongshuai3; Cui，Yinan4; Wang，Jiarong1; Di Gao，1; Wang，Jiachen4; Liu，Changmeng1

2022-10-01

10.1016/j.addma.2022.103042

Additive Manufacturing   Impact Factor & Quartile

2214-8604

2214-8604

The Al-Zn-Mg-Cu alloys fabricated by wire arc additive manufacturing (WAAM) have inferior performance due to poor microstructures and inevitable defects, which restrict their development. This study explored the hot-wire arc additive manufacturing (HWAAM) of the 7055 alloy, and proposed a three-stage solution and aging heat treatment method to further improve its mechanical properties. Both as-deposited and heat treated samples were mainly composed of equiaxed grains. Within grains of the as-deposited sample, the Mg(Zn,Cu) were precipitated. After heat treatment, apart from the small and abundant Mg(Zn,Cu) precipitates, the AlZr were also precipitated. Crack-free 7055 alloy parts were obtained, and the low porosity of as-deposited and heat treated samples were 0.18 % and 0.26 %, respectively. In addition, the alternating clustered-pore zones and discrete-pore zones were observed in both samples. After heat treatment, UTS and elongation were 563 ± 7 MPa and 10.0 ± 1.2 %, respectively, and negligible mechanical anisotropy of Al-Zn-Mg-Cu alloys was obtained. The good properties, which reached the wrought level, were attributed to the equiaxed grains and low porosity, as well as abundant strengthening phases. This work demonstrated the potential of additive manufacturing to fabricate alloys with unique microstructures and high performance for structural applications.

Al-Zn-Mg-Cu alloys Grain morphologies Hot-wire arc additive manufacturing Mechanical properties Pores Strengthening precipitates

SCI ; EI

English

Others

National Natural Science Foundation of China[51875041];National Natural Science Foundation of China[52105319];

Engineering ; Materials Science

Engineering, Manufacturing ; Materials Science, Multidisciplinary

WOS:000861051900003

ELSEVIER

20223312562842

3D printers ; Additives ; Binary alloys ; Copper alloys ; Heat treatment ; High strength alloys ; Magnesium alloys ; Porosity ; Textures ; Wire ; Zinc alloys ; Zircaloy

Metallurgy and Metallography:531 ; Metallurgy:531.1 ; Metal Forming:535.2 ; Heat Treatment Processes:537.1 ; Aluminum Alloys:541.2 ; Magnesium and Alloys:542.2 ; Copper Alloys:544.2 ; Zinc and Alloys:546.3 ; Alkaline Earth Metals:549.2 ; Printing Equipment:745.1.1 ; Chemical Agents and Basic Industrial Chemicals:803 ; Physical Properties of Gases, Liquids and Solids:931.2

2-s2.0-85135684371

Scopus

1.School of Mechanical Engineering,Beijing Institute of Technology,Beijing,100081,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures,Beijing Institute of Technology,Beijing,100081,China
4.Applied Mechanics Lab.,School of Aerospace Engineering,Tsinghua University,Beijing,100084,China

Fu，Rui,Lu，Wenjun,Guo，Yueling,et al. Achieving high strength-ductility of Al-Zn-Mg-Cu alloys via hot-wire arc additive manufacturing enabled by strengthening precipitates[J]. Additive Manufacturing,2022,58.

Fu，Rui.,Lu，Wenjun.,Guo，Yueling.,Lei，Hongshuai.,Cui，Yinan.,...&Liu，Changmeng.(2022).Achieving high strength-ductility of Al-Zn-Mg-Cu alloys via hot-wire arc additive manufacturing enabled by strengthening precipitates.Additive Manufacturing,58.

Fu，Rui,et al."Achieving high strength-ductility of Al-Zn-Mg-Cu alloys via hot-wire arc additive manufacturing enabled by strengthening precipitates".Additive Manufacturing 58(2022).