Method for improving mechanical properties of aluminum alloy bulk material prepared by cold spraying
A block material and aluminum alloy technology, applied in the field of additive manufacturing, can solve the problems of poor mechanical properties, low degree of particle bonding, high porosity, etc., and achieve low cost, high preparation feasibility, and small defect density.
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Embodiment 1
[0033] A380 aluminum alloy spherical powder with an average particle size of 20 μm and alumina spherical powder with an average particle size of 60 μm were selected to form a mixed powder, the mass fraction of alumina was 5 wt%, and the mixed powder was mixed in a ball mill for about 4 hours; The alloy powder is deposited on the stainless steel substrate, using compressed air as the working gas, the gas temperature is 300°C, the gas pressure is 2.0MPa, and the spraying distance is 20mm. At the same time, the prepared bulk material was heat-treated in vacuum at 300 °C for 6 h. In this example, the nozzle of the cold spraying equipment was not clogged, and the prepared A380 aluminum alloy block material had a thickness of 2cm, a porosity of about 0.8%, a tensile strength of 300MPa, a yield strength of 210MPa, and an elongation of about 1.5%. .
Embodiment 2
[0035] A380 aluminum alloy spherical powder with an average particle size of 30 μm and alumina spherical powder with an average particle size of 70 μm were selected to form a mixed powder, the mass fraction of alumina was 7 wt%, and the mixed powder was mixed in a ball mill for about 4 hours; The alloy powder is deposited on the stainless steel substrate, using compressed air as the working gas, the gas temperature is 350°C, the gas pressure is 2.3MPa, and the spraying distance is 20mm. At the same time, the prepared bulk material was heat-treated in vacuum at 350 °C for 6 h. In this example, the nozzle of the cold spraying equipment was not clogged, and the prepared A380 aluminum alloy block material had a thickness of 2cm, a porosity of about 0.6%, a tensile strength of 340MPa, a yield strength of 243MPa, and an elongation of about 2%. .
Embodiment 3
[0037]A380 aluminum alloy spherical powder with an average particle size of 30 μm and alumina spherical powder with an average particle size of 100 μm were selected to form a mixed powder, the mass fraction of alumina was 10 wt%, and the mixed powder was mixed in a ball mill for about 4 hours; The alloy powder is deposited on the stainless steel substrate, using compressed air as the working gas, the gas temperature is 400°C, the gas pressure is 2.5MPa, and the spraying distance is 20mm. At the same time, the prepared bulk material was vacuum heat-treated at 350 °C for 4 h. In this example, the nozzle of the cold spraying equipment was not clogged, and the prepared A380 aluminum alloy block material had a thickness of 2cm, a porosity of about 0.5%, a tensile strength of 365MPa, a yield strength of 250MPa, and an elongation of about 2.5%. .
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