title: Preparation and characterization of laser-melted Mg-Sn-Zn alloys for biomedical application.
abstract: The rapid degradation rate of Magnesium (Mg) alloy limits its biomedical application even though it possesses outstanding biological performance and biomechanical compatibility. In this study, a combined method of laser rapid melting and alloying Zinc (Zn) was proposed to decrease the degradation rate of Mg-Sn alloy. The microstructure, degradation behaviors and mechanical properties of the laser-melted Mg-5Sn-xZn (x = 0, 2, 4, 6 and 8 wt.%) alloys were investigated. The results indicated that the grain size of the alloys decreased with increasing Zn content, due to the increased number of nucleation particles formed in the process of solidification. Moreover, the laser-melted Mg-Sn alloys possessed finer grains compared with traditional as-cast and as-rolled Mg-Sn alloys. The degradation rate of the alloys decreased with increasing Zn content (0-4 wt.%), which was ascribed to the grain refinement and the formation of Zn(OH)2protective layer. However, the degradation rate increased as the Zn content further increased (4-8 wt.%), which was caused by the galvanic corrosion between the Mg matrix and the generated Mg7Zn3phase. Besides, Zn also increased the hardness of the alloys owing to the grain refinement strengthening and solid solution strengthening.
authors.affiliation: State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China.
authors.forename: Cijun
authors.initials: C
authors.lastname: Shuai
authors.affiliation: State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China.
authors.forename: Yuanzhuo
authors.initials: Y
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Lin
authors.affiliation: State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China.
authors.forename: Youwen
authors.initials: Y
authors.lastname: Yang
authors.affiliation: State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China.
authors.forename: Chengde
authors.initials: C
authors.lastname: Gao
authors.affiliation: State Key Laboratory for Powder Metallurgy, Central South University, Changsha, 410083, China.
authors.forename: Xiong
authors.initials: X
authors.lastname: Shuai
authors.affiliation: State Key Laboratory for Powder Metallurgy, Central South University, Changsha, 410083, China.
authors.forename: Hong
authors.initials: H
authors.lastname: Wu
authors.affiliation: Hunan Farsoon High-Technology Co. Ltd, Changsha, 410083, China.
authors.forename: Xinyan
authors.initials: X
authors.lastname: Liu
authors.affiliation: College of Chemistry, Xiangtan University, Xiangtan, 411105, China. pingwu@xtu.edu.cn.
authors.forename: Ping
authors.initials: P
authors.lastname: Wu
authors.affiliation: State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha, 410083, China. fengpei@csu.edu.cn.
authors.forename: Pei
authors.initials: P
authors.lastname: Feng
mesh_terms: D020341:Absorbable Implants; D000497:Alloys / Q000737:chemistry*; D001672:Biocompatible Materials / Q000737:chemistry; D001696:Biomechanical Phenomena; D003343:Corrosion; D003460:Crystallization; D018360:Crystallography, X-Ray; D006244:Hardness; D006801:Humans; D007834:Lasers; D008274:Magnesium / Q000737:chemistry*; D008422:Materials Testing / Q000379:methods; D011208:Powders; D012996:Solutions; D013314:Stress, Mechanical; D014001:Tin / Q000737:chemistry*; D015032:Zinc / Q000737:chemistry*
chemical_list: D000497:Alloys; D001672:Biocompatible Materials; D011208:Powders; D012996:Solutions; D014001:Tin; D008274:Magnesium; D015032:Zinc