首页|Additive manufacturing of NiTi lightweight porous structures bio-mimicking coral skeleton with enhanced mechanical properties and shape memory functions

Additive manufacturing of NiTi lightweight porous structures bio-mimicking coral skeleton with enhanced mechanical properties and shape memory functions

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Concerning the high demand for lightweight and multifunctional properties of engineering structures,the coral skeleton-inspired sheet-based(CSS)structure,which was a novel bio-mimicking coral skeleton wall-septa architecture with a unique ability to resist wave shocks was fabricated using NiTi alloy by laser powder bed fusion(LPBF)technology.The effects of laser energy density(LED)on surface morphologies,microstructures,phase transformation behavior,and mechanical properties of LPBF-fabricated CSS structures were systematically investigated.The results indicated that the size deviation was predominantly governed by powder adhesion and step effect.NiTi CSS structures with LED of 71 Jmm3 possessed superior compressive modulus(～400 MPa),ultimate strength(～13 MPa),and energy absorption efficiency(～69％).The compression fracture me-chanism of the LPBF-fabricated NiTi CSS structures was revealed to be predominantly brittle fracture accompanied by ductile fracture.Furthermore,the Ni4Ti3 nanoprecipitates induced the precipitation strengthening effect,enabling better shape memory response at LED of 71 J·mm-3,with a recoverable strain of 3.63％and recovery ratio of 90.8％,after heating under a pre-strain of 4％.This study highlights the importance of a bionic design strategy for enhancing the mechanical properties of NiTi components and offers the possibility to tailor its functional properties.

bioinspired structureslaser powder bed fusionNiTi shape memory alloymechanical performance

LIU Xin、GU DongDong、YUAN LuHao、ZHANG Han、SUN JianFeng、CHEN WenXin、WANG Jie、SHI KeYu

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Jiangsu Provincial Research Center for Laser Additive Manufacturing of High-Performance Components,College of Materials Science and Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China

National Natural Science Foundation of ChinaKey Research and Development Program of Jiangsu ProvinceKey Research and Development Program of Jiangsu ProvinceNational Natural Science Foundation of China for Creative Research GroupsNational Key Research and Development Program of China

52225503BE2022069BE2022069-1519210032022YFB3805701

2024

10.1007/s11431-024-2668-5

中国科学:技术科学(英文版)
中国科学院

中国科学:技术科学(英文版)

CSTPCDEI
影响因子：1.056
ISSN：1674-7321
年,卷(期)：2024.67(8)
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