Microstructure and Corrosion Resistance of AA4047/AA7075 Transition Zone Formed Using Electron Beam Wire-Feed Additive Manufacturing

A gradient transition zone was obtained using electron beam deposition from AA4047 wire on AA7075 substrate and characterized for microstructures, tensile strength and corrosion resistance. The microstructure of the transition zone was composed of aluminum alloy grains, Al/Si eutectics and Fe-rich and Si-rich particles. Such a microstructure provided strength comparable to that of AA7075-T42 substrate but more intense corrosion due to the higher amount of anodic Mg2Si particles. The as-deposited AA4047 zone formed above the transition zone was composed of aluminum alloy dendrites and interdendritic Al/Si eutectics with low mechanical strength and high corrosion potential.

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Characterization of AA7075/AA5356 gradient transition zone in an electron beam wire-feed additive manufactured sample

Materials Characterization ◽

10.1016/j.matchar.2020.110867 ◽

2021 ◽

Vol 172 ◽

pp. 110867

Author(s):

V. Utyaganova ◽

A. Filippov ◽

S. Tarasov ◽

N. Shamarin ◽

D. Gurianov ◽

...

Keyword(s):

Electron Beam ◽

Transition Zone ◽

Feed Additive ◽

Wire Feed

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Characterization of gradient CuAl–B4C composites additively manufactured using a combination of wire-feed and powder-bed electron beam deposition methods

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2020.157824 ◽

2020 ◽

pp. 157824

Author(s):

A.V. Filippov ◽

E.S. Khoroshko ◽

N.N. Shamarin ◽

N.L. Savchenko ◽

E.N. Moskvichev ◽

...

Keyword(s):

Electron Beam ◽

Powder Bed ◽

Electron Beam Deposition ◽

Wire Feed ◽

Beam Deposition

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Microstructural Evolution of AA5154 Layers Intermixed with Mo Powder during Electron Beam Wire-Feed Additive Manufacturing (EBAM)

Metals ◽

10.3390/met12010109 ◽

2022 ◽

Vol 12 (1) ◽

pp. 109

Author(s):

Anna Zykova ◽

Andrey Chumaevskii ◽

Andrey Vorontsov ◽

Nickolay Shamarin ◽

Aleksandr Panfilov ◽

...

Keyword(s):

Shear Strength ◽

Aluminum Alloy ◽

Electron Beam ◽

Feed Additive ◽

Powder Bed ◽

Simultaneous Transfer ◽

Mixed Layers ◽

Wire Feed ◽

Disk Test ◽

Low Shear

AA5154 aluminum alloy wall was built using EBAM where the wall’s top layers were alloyed by depositing and then remelting a Mo powder-bed with simultaneous transfer of aluminum alloy from the AA5154 wire. The powder-beds with different concentrations of Mo such as 0.3, 0.6, 0.9 and 1.2 g/layer were used to obtain composite AA5154/Mo samples. All samples were characterized by inhomogeneous structures composed of as-deposited AA5154 matrix with coarse unreacted Mo articles and intermetallic compounds (IMC) such as Al12Mo, Al5Mo, Al8Mo3, Al18Mg3Mo2 which formed in the vicinity of these Mo particles. The IMC content increased with the Mo powder-bed concentrations. The AA5154 matrix grains away from the Mo particles contained Al-Fe grain boundary precipitates. Mo-rich regions in the 0.3, 0.6, 0.9 and 1.2 g/layer Mo samples had maximum microhardness at the level of 2300, 2600, 11,500 and 9000 GPa, respectively. Sliding pin-on-steel disk test showed that wear of A5154/Mo composite reduced as compared to that of as-deposited AA5154 due to composite structure, higher microhardness as a well as tribooxidation of Al/Mo IMCs and generation of mechanically mixed layers containing low shear strength Mo8O23 and Al2(MoO4)3 oxides.

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