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WADED Al-Mg and Al-Mg-Sc-Zr aluminium alloy thin-wall components were produced. Heat treatment (350°C aging for 4 h) was further conducted. The effects of Sc/Zr addition on porosity, microstructure, mechanical properties and corrosion behaviour were investigated. With Sc/Zr adding, pore area fraction decreased from 0.208 to 0.005% and grain size de...
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Citations
... Wire arc additive manufacturing (WAAM), with the advantages of a high material utilisation rate, high deposition rate and low equipment cost, is a special technology used to directly fabricate parts by depositing layers of material [8,9]. Nowadays, WAAM has been used to fabricate NiTi shape memory alloy walls using commercial NiTi wire [10,11]. ...
Traditional manufacturing methods for Ti–Ni–Cu alloy are casting and powder metallurgy with the disadvantages such as high cost and long periods. In this study, Ti–Ni–Cu alloys are fabricated by treble-wire arc additive manufacturing (T-WAAM), a new technology with short periods, using pure Ti, pure Ni and pure Cu wires as raw materials. The results show that with an increase of Cu content from 5 at.% to 25 at.%, the phase transition temperature increases sharply from 30°C to 62°C. The ultimate tensile strength of Ti50Ni45Cu5, Ti50Ni35Cu15 and Ti50Ni25Cu25 is 248.2 ± 4.6 MPa, 534.8 ± 3.7 MPa and 261.8 ± 4.2 MPa, respectively. Their strain is 1.71 ± 0.31%, 6.42 ± 0.33% and 3.36 ± 0.37%, respectively. Their fracture mode is a brittle fracture. This study indicates that T-WAAM technology with in-situ alloying is feasible to fabricate the Ti–Ni–Cu alloys.
... 5xxx series aluminum alloys, regarded as Al-Mg alloys, are sparked by good corrosion resistance and high mechanical performances since they can be strengthened via the solution of Mg atoms and be further strengthened by mechanical working [1][2][3][4]. During the melting and re-solidification process, Eutectic Al-Al 3 Mg 2 phases are easily formed along the grain boundaries deteriorating the enhancement of mechanical properties for high-magnesium-content aluminum alloys [5][6][7]. ...
The formation of eutectic Al-Mg2Al3 phases along the grain boundaries makes it difficult to improve the mechanical properties of high-magnesium-content aluminum alloys. Here, wire-based friction stir additive manufacturing(W-FSAM) was proposed as a novel solid-state additive manufacturing technology. The shearing, transport, and thermo-plasticisation processes of the deposited materials were achieved by a rotational tool and a stationary barrel. The original Mg2Al3 phases were refined and dissolved into the matrix and formed supersaturated solid solution structures. The refined grains with a diameter of 1.27 ± 0.64 μm were achieved through the dynamic recrystallization process. The components achieved isotropic mechanical properties due to the homogeneous equiaxed fine-grain structure. The ultimate tensile strength reached 415 ± 11 MPa with an elongation of 31.0 ± 2.0%, superior to the commercial 5xxx products. The enhanced strain hardening capacity was achieved by the suppressed emission of dislocations from grain boundaries and the interaction between the supersaturated solid solute atoms and mobile dislocation.
... Wire-arc directed energy deposition (DED) is an efficient and low-cost additive manufacturing technology for large-scale aluminium alloys [1]. Applying electric arcs as the heat source, wire-arc DED has lower solidification rates (usually 10 2 -10 4 K/s [2]) than additive manufacturing technologies based on high-energy beams (∼10 6 K/s [3] for selective laser melting (SLM)), leading to lower solidification shrinkage rates. ...
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Aluminum alloys are extensively used in the aerospace industry. These alloys are essential to the aerospace industry due to their unique combinations of strength, lightweight properties, and resistance to harsh environmental conditions like temperature fluctuations and humidity. The main aerospace structures, such as aircraft or space shuttle wing components, fuselage parts, control surfaces, satellite frames, etc., are made from aluminum alloys. This study investigates various aluminum alloys, such as Al-Cu, Al-Mg, Al-Mg-Si, Al-Zn, and Al-Li, in the aerospace sector.
