4d printing method for in-situ regulation of functional properties of nickel-titanium alloy and use thereof

[0026]1. Atomization milling: Mixing Ti and Ni according to the atomic ratio of Ti 50.6 at. % and Ni 49.4 at. %, and smelting them in vacuum to obtain NiTi alloy bars; atomizing the bars to obtain the original powder, and sieving the original powder to control the particle size of the target powder in the range of 15-53 μm.

[0027]2. Powder modification: Using a Plasma-BM-S plasma ball mill to treat the sieved NiTi alloy powder (mass ml) by discharging with the following control parameters: the voltage at 130 V, the current at 1.4 A, the electrode speed at 800 r / min, the discharge plasma treatments for 6 times, each discharge treatment for 0.5 h, and an interval of 30 min between two adjacent discharge treatments; then adding Ni powder with a mass of m2 and a particle size of 100 nm to the NiTi alloy powder treated by the discharge plasma, and controlling the ratio of m1:m2 to 30:1, so that the ratio of Ti:Ni in the mixed powder was 49.1:50.9 (at. %); then adjusting the electrode speed

[0032]1. Milling: Mixing Ti and Ni according to the atomic ratio of Ti 60 at. % and Ni 40 at. %, and smelting them in vacuum to obtain NiTi alloy bars; atomizing the bars to obtain the original powder, and sieving the original powder to control the particle size of the target powder in the range of 15-53 μm.

[0033]2. Powder modification: Using a Plasma-BM-S plasma ball mill to treat the sieved NiTi alloy powder (mass m1) by discharging with the following control parameters: the voltage at 120 V, the current at 1 A, the electrode speed at 1000 r / min, the discharge treatments for 3 times, each discharge treatment for 1 h, and an interval of 45 min between two adjacent discharge treatments; then adding Ni powder with a mass of m2 and a particle size of 500 nm to the original powder after the discharge treatment, and controlling the ratio of m1:m2 to 4.91:1, so that the ratio of Ti:Ni in the mixed powder was 49.2:50.8 (at. %); then adjusting the electrode speed to 700 r / min and controll

[0036]1. Milling: Mixing Ti and Ni according to the atomic ratio of Ti 50 at. % and Ni 50 at. %, and smelting them in vacuum to obtain NiTi alloy bars; atomizing the bars to obtain the original powder, and sieving the original powder to control the particle size of the target powder in the range of 15-53 μm.

[0037]2. Powder modification: Using a Plasma-BM-S plasma ball mill to treat the sieved NiTi alloy powder (mass ml) by discharging with the following control parameters: the voltage at 125 V, the current at 1.4 A, the electrode speed at 800 r / min, the discharge treatments for 3 times, each discharge treatment for 1.5 h, and an interval of 30 min between two adjacent discharge treatments; then adding Ni powder with a mass of m2 and a particle size of 300 nm to the original powder after the discharge treatment, and controlling the ratio of m1:m2 to 44.4:1, so that the ratio of Ti:Ni in the mixed powder was 49:51 (at. %); then adjusting the electrode speed to 500 r / min and controlli