A continuous net-like eutectic structure enhances the corrosion resistance of Mg alloys  

作　　者：Cijun Shuai Wenjing Yang Youwen Yang Chengde Gao Chongxian He Hao Pan 

机构地区：[1]State Key Laboratory of High Performance Complex Manufacturing,College of Mechanical and Electrical Engineering,Central South University,Changsha 410083,People’s Republic of China [2]Jiangxi University of Science and Technology,Ganzhou 341000,People’s Republic of China [3]Shenzhen Institute of Information Technology,Shenzhen 518172,People’s Republic of China [4]Department of Periodontics and Oral Mucosal Section,Xiangya Stomatological Hospital,Central South University,Changsha 410078,People’s Republic of China

出　　处：《International Journal of Bioprinting》2019年第2期49-60,共12页国际生物打印期刊

基　　金：This study was supported by the following funds:(1)The natural science foundation of China(81871494,81871498,51705540);(2)Hunan provincial natural science foundation of China(2018JJ3671,2019JJ50588);(3)Guangdong province higher vocational colleges and schools pearl river scholar funded scheme(2018);(4)The open sharing fund for the large-scale instruments and equipments of central South university;(5)The project of hunan provincial science and technology plan(2017RS3008);Shenzhen science and technology plan project(JCYJ20170817112445033);(6)National postdoctoral program for innovative talents(BX201700291);(7)The China postdoctoral science foundation(2018M632983);(8)The fundamental research funds for the central universities of central South University(2019zzts005).

摘　　要：Mg alloys degrade rather rapidly in a physiological environment,although they have good biocompatibility and favorable mechanical properties.In this study,Ti was introduced into AZ61 alloy fabricated by selective laser melting,aiming to improve the corrosion resistance.Results indicated that Ti promoted the formation of Al-enriched eutecticαphase and reduced the formation ofβ-Mg17Al12 phase.With Ti content reaching to 0.5 wt.%,the Al-enriched eutecticαphase constructed a continuous net-like structure along the grain boundaries,which could act as a barrier to prevent the Mg matrix from corrosion progression.On the other hand,the Al-enriched eutecticαphase was less cathodic thanβ-Mg17Al12 phase in AZ61,thus alleviating the corrosion progress due to the decreased potential difference.As a consequence,the degradation rate dramatically decreased from 0.74 to 0.24 mg·cm-2·d-1.Meanwhile,the compressive strength and microhardness were increased by 59.4%and 15.6%,respectively.Moreover,the Ti-contained AZ61 alloy exhibited improved cytocompatibility.It was suggested that Ti-contained AZ61 alloy was a promising material for bone implants application.

关 键 词：eutecticαphase net-like structure selective laser MELTING mg ALLOYS corrosion resistance 

分 类 号：TG1[金属学及工艺—金属学]