首页|Microstructural evolution,mechanical properties and corrosion mechanisms of additively manufactured biodegradable Zn-Cu alloys

Microstructural evolution,mechanical properties and corrosion mechanisms of additively manufactured biodegradable Zn-Cu alloys

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Additively manufactured(AM)biodegradable zinc(Zn)alloys constitute an important branch of orthope-dic implants because of their moderate degradation properties and bone-mimicking mechanical proper-ties.In this paper,the microstructural evolution and corrosion mechanisms of zinc-copper(Zn-Cu)alloys prepared by the laser-powder-bed-fusion(L-PBF)additive manufacturing method were investigated.Al-loying with Cu significantly increases the ultimate tensile strength(UTS)of unalloyed Zn,but the UTS and ductility of unalloyed Zn and Zn-2Cu decrease with increasing laser energy density.Unalloyed Zn has a dendritic microstructure,while Zn-2Cu alloy has a peritectic microstructure.The formation of round peri-tectic grains is due to the low-temperature gradient of unalloyed Zn during the AM.The Zn-2Cu samples exhibited higher corrosion rates,addressing the problem of slow degradation of unalloyed Zn.The grain size distribution influences the corrosion behavior of the material.It enhances the corrosion rates of ma-terials with fine grains in a non-passivating environment.However,the 100％extracts of Zn-2Cu samples exhibited greater values of cellular activity compared to unalloyed Zn samples,thus confirming their bet-ter cytocompatibility.This work demonstrates the great potential to design and modulate biodegradable Zn alloys to fulfill clinical needs by using AM technology.

Additive manufacturingZn-Cu alloyMicrostructureMechanical propertyCorrosion behavior

Jingbo Liu、Dekuan Wang、Bo Liu、Ning Li、Luxin Liang、Chao Chen、Kechao Zhou、Ian Baker、Hong Wu

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State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China

Department of General Surgery,The Second Xiangya Hospital,Central South University,Changsha 410011,China

Department of Oral and Maxillofacial Surgery,Center of Stomatology,Xiangya Hospital,Central South University,Changsha 410008,China

Department of Orthopedics,The Second Xiangya Hospital,Central South University,Changsha 410011,China

Thayer School of Engineering,Dartmouth College,Hanover,NH 03755-8000,USA

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National Natural Science Foundation of ChinaKey Research and Development Program of Hunan ProvinceNatural Science Foundation of Hunan ProvinceNatural Science Foundation of Hunan Province for Distinguished Young ScholarsChangsha Municipal Natural Science FoundationCentral South University Research Program of Advanced Interdisciplinary StudiesFundamental Research Funds for the Central Universities of Central South University

520713462022SK20062023JJ408362023JJ10075kq22024172023QYJC0382021zzts0110

2024

10.1016/j.jmst.2023.10.052

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.186(19)
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