300 MPa grade highly ductile biodegradable Zn-2Cu-(0.2-0.8)Li alloys with novel ternary phases  

作　　者：Meng Cao Zhe Xue Zhao-Yong Lv Jin-Ling Sun Zhang-Zhi Shi Lu-Ning Wang 

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advance Metals and Materials,School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China [2]Orthopedics Department,Peking University ShouGang Hospital,Beijing 100144,China [3]Advanced Technology and Materials Co.,Ltd.(AT&M),Beijing 100081,China [4]Liaocheng People’s Hospital,Liaocheng Hospital Affiliated to Shandong First Medical University,Liaocheng 252000,China

出　　处：《Journal of Materials Science & Technology》2023年第26期234-245,共12页材料科学技术（英文版）

基　　金：financially supported by Xiongan New Area Science and Technology Innovation Project(2022XACX0600);the National Natural Science Foundation of China(Nos.52231010,52071028).

摘　　要：Although a few high-strength biodegradable Zn alloys with yield strengths(YSs)over 300 MPa in rolled state have been developed,their elongations(ELs)are generally less than 30%.This study developed rolled Zn-2Cu-x Li(x=0.2 wt.%,0.5 wt.%,0.8 wt.%)alloys with YSs of 316-335 MPa and ELs of 44%-61%.Three-dimensional atom probe(3DAP)and time of flight secondary ion mass spectrometry(TOF-SIMS)were employed to characterize Li distribution.Three kinds of Zn-Cu-Li ternary phases are identified,which are blockyε′-(Cu_(0.5),Li_(0.5))Zn 4,blockyβ′-(Li_(0.9),Cu_(0.1))Zn 4,and small roundγparticles with high Li content in the annealed state.Other identified phases are Zn,β-LiZn 4,andε-CuZn 4 phases.With the increase of Li content in the alloys,ε′phase with 6.50 at.%Cu transforms intoβ′phase with 2.12 at.%Cu,i.e.,the average level in the alloys.Withinε′phase,there exist nano-scale Li clusters andεphase,resulting inε′/εstructure.Dense Zn laths precipitate fromβ′phase,resulting inβ′/Zn lamellar structure.The lamel-lar structure is the matrix of Zn-2Cu-0.8Li and leads to near-isotropic plasticity.Electrochemistry tests show that degradation rates fall in the range of 153-196μm/year,which decrease with Li content.All the alloys exert positive effects on the growth of MC3T3-E1 cells with 10%extract.This research reveals how microstructure evolves in Zn-2Cu-x Li alloys,which lays the foundation for their future applications.

关 键 词：Biodegradable Zn alloys Zn-Cu-Li ternary phase Microstructure 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG665[金属学及工艺—金属材料]