Microstructures and Properties of Al-Mg Alloys Manufactured by WAAM-CMT

Abstract

A wire arc additive manufacturing system, based on cold metal transfer technology, was utilized to manufacture the Al-Mg alloy walls. ER5556 wire was used as the filler metal to deposit Al-Mg alloys layer by layer. Based on the orthogonal experiments, the process parameters of the welding current, welding speed and gas flow, as well as interlayer residence time, were adjusted to investigate the microstructure, phase composition and crystal orientation as well as material properties of Al-Mg alloyed additive. The results show that the grain size of Al-Mg alloyed additive becomes smaller with the decrease of welding current or increased welding speed. It is easier to obtain the additive parts with better grain uniformity with the increase of gas flow or interlayer residence time. The phase composition of Al-Mg alloyed additive consists of α-Al matrix and γ (Al12Mg17) phase. The eutectic reaction occurs during the additive manufacturing process, and the liquefying film is formed on the α-Al matrix and coated on the γ phase surface. The crystal grows preferentially along the <111> and <101> orientations. When the welding current is 90 A, the welding speed is 700 mm/min, the gas flow is 22.5 L/min and the interlayer residence time is 5 min, the Al-Mg alloy additive obtains the highest tensile strength. Under the optimal process parameters, the average grain size of Al-Mg alloyed additive is 25 μm, the transverse tensile strength reaches 382 MPa, the impact absorption energy is 26 J, and the corrosion current density is 3.485 × 10−6 A·cm-2. Both tensile and impact fracture modes of Al-Mg alloyed additive are ductile fractures. From the current view, the Al-Mg alloys manufactured by WAAM-CMT have a better performance than those produced by the traditional casting process.

Carbenes trapping on Aluminum-Magnesium surface implanted with Silicon, Germanium, Tin: Promising of semiconductors by molecular modeling approach

“…𝜎 𝑖𝑠𝑜,𝑂𝑁𝐼𝑂𝑀 = 𝜎 𝑖𝑠𝑜,ℎ𝑖𝑔ℎ(𝑄𝑀1) + 𝜎 𝑖𝑠𝑜,𝑚𝑒𝑑𝑖𝑢𝑚(𝑄𝑀2) + 𝜎 𝑖𝑠𝑜,𝑙𝑜𝑤(𝑄𝑀3) (7) It presents that σiso and σaniso enhance with the occupancy and then the negative charge of nitrogen atom in pyridine and its derivatives diffusing onto Al-Mg-X (X = Si, Ge, Sn) nanoalloy surface (Figure 1a-e). 1a-e).…”

“…However, the interactions between solute atoms and vacancies in Al-Mg-Ge nanoalloys are not vivid. Among the various methods that minimize corrosion of metal surface, its inhibition by organic molecules is one of the most applicable methods because of its stability and low cost [6][7][8][9][10][11][12][13][14][15][16] .…”

Wire-arc additive manufactured Al–Cu alloy: Microstructure, mechanical properties and their anisotropy

“…Additive manufacturing (AM) is a near-net forming technology based on the computer aided design and manufacturing (CAD/CAM) to melt and solidify materials in different states, such as wire, powder, fluid and block, layer by layer into a whole structure [1,2]. In recent years, Wire + Arc Additive Manufacturing (WAAM) technology, which obtains manufactured solid components by planning the route of material accumulation layer by layer with melt wires, has attracted more and more attention, especially in the field of aerospace [3][4][5], automotive [6] and rapid die industries [7,8]. At present, aluminium alloy has become one of the most commonly used raw metal materials in the WAAM process [9].…”

Research Progress in High-Performance Magnesium Alloy and Its Applications

“…Additive manufacturing (AM) is largely capable of manufacturing structures with high complexities. Liu et al [10] manufactured Al-Mg alloy walls via WAAM (wire and arc additive manufacturing), which showed better performance than those produced using the traditional casting process under the optimal process parameters.…”