Effect of Solution Aging on the Microstructure and Mechanical Properties of CMT Arc Additive Manufactured 2319 Aluminum Alloy

YIN Junjie; BU Wende; ZHANG Xinqiang; WANG Lei; GUO Shunhua; WANG Shuai; HE Shengcai

doi:10.3969/j.issn.1674-6457.2025.11.019

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (11) : 201-207. DOI: 10.3969/j.issn.1674-6457.2025.11.019

Light Alloy Forming

Effect of Solution Aging on the Microstructure and Mechanical Properties of CMT Arc Additive Manufactured 2319 Aluminum Alloy

YIN Junjie¹, BU Wende^1,*, ZHANG Xinqiang¹, WANG Lei², GUO Shunhua¹, WANG Shuai¹, HE Shengcai¹

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Abstract

The work aims to investigate the effects of solution and aging temperatures on the microstructure and mechanical properties of 2319 aluminum alloy fabricated by CMT arc additive manufacturing, providing a reference for the heat treatment of 2319 aluminum alloy in arc additive manufacturing. 2319 aluminum alloy specimens were prepared with the CMT arc additive manufacturing method. The specimens were first subject to solution treatment at different temperatures (520 ℃/3 h, 535 ℃/3 h, and 550 ℃/3 h) to obtain supersaturated solid solutions, followed by aging treatment at different temperatures (150 ℃/3 h, 175 ℃/3 h, and 200 ℃/3 h). The microstructure and tensile fracture morphology of the specimens were observed through optical microscopy and scanning electron microscopy. The mechanical properties of the specimens were tested with a tensile testing machine and a hardness tester, and the reasons for changes in microstructure and mechanical properties were analyzed. The microstructure of the as-deposited and heat-treated specimens mainly consisted of equiaxed and columnar grains, with a large number of θ phase (Al₂Cu) distributed within the grains and at grain boundaries. The as-deposited state primarily comprised α-Al matrix and θ (Al₂Cu) phase. At an aging temperature of 150 ℃, θ" phase precipitated, and the amount of θ" phase significantly increased at 175 ℃. At 200 ℃, θ' phase appeared in the precipitates. After solution treatment at 535 ℃/3 h and aging at 175 ℃/3 h, the tensile strength of the 2319 aluminum alloy specimen reached 382.7 MPa, the yield strength was 196.7 MPa, the elongation was 17.7%, the average hardness was 121.6HV, and the fracture mode was ductile fracture. The properties of 2319 aluminum alloy fabricated by CMT arc additive manufacturing are significantly improved through solution and aging treatment. The circular or elliptical θ" (Al₂Cu) precipitates are the main reason for the enhancement of the mechanical properties of 2319 aluminum alloy.

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arc additive manufacturing / 2319 aluminum alloy / solution aging / microstructure / mechanical properties

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YIN Junjie, BU Wende, ZHANG Xinqiang, WANG Lei, GUO Shunhua, WANG Shuai, HE Shengcai. Effect of Solution Aging on the Microstructure and Mechanical Properties of CMT Arc Additive Manufactured 2319 Aluminum Alloy[J]. Journal of Netshape Forming Engineering. 2025, 17(11): 201-207 https://doi.org/10.3969/j.issn.1674-6457.2025.11.019

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