Abstract
In this study, an Al–Mg alloy was fabricated by wire arc additive manufacture (WAAM), and the effect of Mg content on the microstructure and properties of Al–Mg alloy deposits was investigated. The effects on the deposition surface oxidation, geometry, burn out rate of Mg, pores, microstructure, mechanical properties and fracture mechanisms were investigated. The results show that, when the Mg content increased, the surface oxidation degree increased; a “wave”-shaped deposition layer occurred when the Mg content reached 8%. When the Mg content was more than 6%, the burning loss rate of the Mg element increased significantly. With the increase of Mg content, the number of pores first decreased and then increased, and the size first decreased and then increased. When the Mg content reached 7% or above, obvious crystallization hot cracks appeared in the deposit bodies. When the Mg content increased, the precipitated phase (FeMn)Al6 and β(Mg2Al3) increased, and the grain size increased. When the Mg content was 6%, the comprehensive mechanical properties were best. The horizontal tensile strength, yield strength and elongation were 310 MPa, 225 MPa and 17%, respectively. The vertical tensile strength, yield strength and elongation were 300 MPa, 215 MPa and 15%, respectively. The fracture morphology was a ductile fracture.
Highlights
Wire arc additive manufacture (WAAM) is an additive manufacturing technology which is based on the discrete additive forming principle to form 3D physical parts suitable for the rapid manufacturing of medium and large-scale parts with medium complexity [1,2,3]
When the Mg content is less than 7%, the surface texture is smooth, and when the Mg content is 8%, the deposition layer shows a
This indicates that the increase of Mg content will increase the surface oxidation degree
Summary
Wire arc additive manufacture (WAAM) is an additive manufacturing technology which is based on the discrete additive forming principle to form 3D physical parts suitable for the rapid manufacturing of medium and large-scale parts with medium complexity [1,2,3]. The WAAM method cannot realize net forming at present, which requires subsequent machining. Most WAAM aluminum alloys are Al–Cu alloys and Al–Si–Mg alloy, which need a solid solution and aging heat treatment to be strengthened [4,5,6]. The pursuit of an Al–Mg alloy with excellent mechanical properties without heat treatment and strengthening has attracted the attention of WAAM manufacturing technology researchers [7,8]. Jiang [9] studied the rapid forming process of 5356 aluminum alloy based on CMT
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