The South China University of Technology

Guangdong Huayi Plumbing Fittings Industry Co., Ltd.

Sun Yat-Sen University Cancer Center

Kaiping Freendo Sanitary Ware Co., Ltd.

Yanfei Ding

Chao Yang

Yuanyuan Li

Haizhou Lu

Jin Wang

Hongwei Ma

Weisi Cai

Zhi Ding

Xiao Yu

Songzhan Feng

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.

NiTiHf high temperature shape memory alloy with two-way shape memory effect, and 4D printing method and application thereof

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 μm; 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.

4D printing method and application of titanium-nickel shape memory alloy

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&#x2dc;60% Cu, 38&#x2dc;42% Zn, 0.003&#x2dc;0.01% B, 0.03&#x2dc;0.06% Ti, and 1.0&#x2dc;1.5% Si and 0.5&#x2dc;0.9% Al or 0.5&#x2dc;0.8% Si and 1&#x2dc;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.

Lead-free easy-cutting high-strength corrosion-resistant silicon-brass alloy and the preparation method and use thereof

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Kaiping, China

Yanfei Ding