The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 29, 2025
Filed:
Oct. 31, 2022
South China University of Technology, Guangdong, CN;
Guangdong Huayi Plumbing Fittings Industry Co., Ltd., Guangdong, CN;
Chao Yang, Guangdong, CN;
Hongwei Ma, Guangdong, CN;
Yanfei Ding, Guangdong, CN;
Weisi Cai, Guangdong, CN;
Xiao Yu, Liaoning, CN;
South China University of Technology, Guangzhou, CN;
GUANGDONG HUAYI PLUMBING FITTINGS INDUSTRY CO., LTD., Kaiping, CN;
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.