Abstract: The present invention belongs to the field of additive manufacturing technology, and discloses a 4D printing method capable of in-situ regulating functional properties of nickel-titanium (NiTi) alloys and the application thereof. The method comprises the following steps: subjecting NiTi alloy bars to atomization milling to obtain NiTi alloy powder with a particle size of 15-53 ?m, placing the NiTi alloy powder in a discharge plasma assisted ball mill for discharge treatment to promote the activation of powder activity, then adding nano-sized Ni powder with a particle size of 100-800 nm to obtain mixed powder, then continuing the discharge treatment to realize the metallurgical bonding between the NiTi alloy powder and the nano-sized Ni powder to obtain the modified powder, and finally using the additive manufacturing technology to prepare and form the modified powder into a functionalized NiTi alloy.

Abstract: Disclosed are a 4D printing method and application of titanium-nickel shape memory alloy. The 4D printing method comprises the following steps: mixing and smelting pure titanium and pure nickel to obtain titanium-nickel alloy bars, then preparing alloy powder by a rotating electrode atomization method, and sieving the powder to obtain titanium-nickel alloy powder with a particle size of 15-53 ?m; placing the obtained titanium-nickel alloy powder in a discharge plasma assisted ball mill for discharge treatment to perform surface modification of the powder; and subjecting the titanium-nickel alloy powder to SLM forming to obtain the titanium-nickel shape memory alloy.

Abstract: The invention belongs to the technical field of shape memory alloys and additive manufacturing, and discloses a NiTiHf high temperature shape memory alloy with two-way shape memory effect and a 4D printing method and application thereof. The 4D printing method includes alloy powder processing, model building and substrate preheating, and 4D printing forming. The present invention patent is based on the design concept of reducing thermal gradient and the environmental friendly concept of clean production. It adopts substrate preheating combined with low laser power and low scanning speed laser powder bed fusion technology or low preheating temperature electron beam powder bed fusion technology to improve the formed alloy. The lattice compatibility with the NiTi substrate reduces the residual stress of the formed sample, and produces no cracks, no obvious holes, density ?99%, high phase transformation temperature, excellent tensile mechanical properties and two-way shape memory effect.

Abstract: A method executed by a User Equipment (UE) supporting Multi-Radio Dual Connectivity (MR-DC) with a first cell group and a second cell group in a mobile communication system is provided. The UE configures a primary path to the first cell group and a secondary path to the second cell group for uplink transmissions in an MR-DC operation. The UE determines whether the primary path is inapplicable when performing the uplink transmissions on the primary path. The UE switches from the primary path to the secondary path to continue the uplink transmissions in response to the primary path being inapplicable.

Abstract: A method executed by a User Equipment (UE) supporting Multi-Radio Dual Connectivity (MR-DC) with a first cell group and a second cell group in a mobile communication system is provided. The UE configures a primary path to the first cell group and a secondary path to the second cell group for uplink transmissions in an MR-DC operation. The UE determines whether the primary path is inapplicable when performing the uplink transmissions on the primary path. The UE switches from the primary path to the secondary path to continue the uplink transmissions in response to the primary path being inapplicable.

Abstract: The present invention belongs to the field of additive manufacturing technology, and discloses a 4D printing method capable of in-situ regulating functional properties of nickel-titanium (NiTi) alloys and the application thereof. The method comprises the following steps: subjecting NiTi alloy bars to atomization milling to obtain NiTi alloy powder with a particle size of 15-53 ?m, placing the NiTi alloy powder in a discharge plasma assisted ball mill for discharge treatment to promote the activation of powder activity, then adding nano-sized Ni powder with a particle size of 100-800 nm to obtain mixed powder, then continuing the discharge treatment to realize the metallurgical bonding between the NiTi alloy powder and the nano-sized Ni powder to obtain the modified powder, and finally using the additive manufacturing technology to prepare and form the modified powder into a functionalized NiTi alloy.

Abstract: A 4D printing method for a titanium-nickel shape memory alloy, and the titanium-nickel shape memory alloy and application thereof. Pure titanium and pure nickel are mixed and smelted, and titanium-nickel alloy bars are obtained; then alloy powder is prepared by means of a rotating electrode atomization method, the powder is sieved, and titanium-nickel alloy powder having a grain size of 15-53 ?m is obtained; and the obtained titanium-nickel alloy powder is placed in a discharge plasma auxiliary ball mill to be subjected to discharge treatment, the powder is subjected to surface modification, and finally the titanium-nickel shape memory alloy is formed by means of SLM forming. The phase composition of the titanium-nickel shape memory alloy is composed of a B2 austenite phase of a CsCl type structure, a B19? Martensite phase of a monocline structure and a Ti2Ni precipitated phase.

Abstract: The present invention relates to a lead-free easy-cutting high-strength corrosion-resistant silicon-brass alloy and the preparation method and use thereof. The mass percent composition of the alloy is: 56˜60% Cu, 38˜42% Zn, 0.003˜0.01% B, 0.03˜0.06% Ti, and 1.0˜1.5% Si and 0.5˜0.9% Al or 0.5˜0.8% Si and 1˜1.5% Al, and the zinc equivalent of all components is between 48% and 50%. In the present invention, the phase composition and the distribution state of the alloy can be regulated by controlling the contents of Si and Al elements, as well as by adding a B and Ti composite grain refiner, in order to obtain a copper alloy with the advantages of excellent comprehensive performance of strength, process ability and dezincification resistance, a high production yield, and low costs, which can replace lead brass and bismuth brass for plumbing, bathroom and a variety of corrosion-resistant parts, and has a bright prospect of popularization and application.

Abstract: The present invention relates to a lead-free easy-cutting high-strength corrosion-resistant silicon-brass alloy and the preparation method and use thereof. The mass percent composition of the alloy is: 56-60% Cu, 38-42% Zn, 0.003-0.01% B, 0.03-0.06% Ti, and 1.0-1.5% Si and 0.5-0.9% Al or 0.5-0.8% Si and 1-1.5% Al, and the zinc equivalent of all components is between 48% and 50%. In the present invention, the phase composition and the distribution state of the alloy can be regulated by controlling the contents of Si and Al elements, as well as by adding a B and Ti composite grain refiner, in order to obtain a copper alloy with the advantages of excellent comprehensive performance of strength, process ability and dezincification resistance, a high production yield, and low costs, which can replace lead brass and bismuth brass for plumbing, bathroom and a variety of corrosion-resistant parts, and has a bright prospect of popularization and application.