title: The processing of Mg alloy micro-tubes for biodegradable vascular stents.
abstract: In this study, through a combination of hot extrusion, cold rolling and drawing, three Mg alloys, Mg-Nd-Zn-Zr (abbr. JDBM), AZ31 and WE43, were successfully fabricated into the high-quality micro-tubes with 3.00mm outer diameter and 180μm thickness for biodegradable stents. This processing method overcame the shortcoming of the poor workability of Mg alloys and could be applied to fabricate sufficiently long tubes with low dimensional errors within 2.8%. Microstructure observation demonstrated that the as-annealed JDBM, AZ31 and WE43 micro-tubes had more uniformly distributed grains with an average size of 10.9μm, 12.9μm and 15.0μm, respectively. Tensile mechanical test results showed that the as-annealed JDBM, AZ31 and WE43 micro-tubes respectively exhibited the yield strength of 123MPa, 172MPa and 113MPa, and significantly different breaking elongation of 26%, 16% and 10%. The following SEM observation showed microvoid coalescence, quasi-cleavage and cleavage fracture, respectively. In addition, EBSD analyses revealed that the as-annealed AZ31 tubes had a strong texture component 21¯1¯0 with a low Schmid factor for basal slip, while JDBM and WE43 tubes respectively exhibited weak textures 101¯0 and 101¯0+202¯1 with a similarly high Schmid factor for basal slip.
authors.affiliation: National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China.
authors.forename: Fei
authors.initials: F
authors.lastname: Liu
authors.affiliation: National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China.
authors.forename: Chenxin
authors.initials: C
authors.lastname: Chen
authors.affiliation: National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China.
authors.forename: Jialin
authors.initials: J
authors.lastname: Niu
authors.affiliation: National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Pei
authors.affiliation: National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Zhang
authors.affiliation: National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China.
authors.forename: Hua
authors.initials: H
authors.lastname: Huang
authors.affiliation: National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China. Electronic address: gyyuan@sjtu.edu.cn.
authors.forename: Guangyin
authors.initials: G
authors.lastname: Yuan
mesh_terms: D020341:Absorbable Implants; D000497:Alloys / Q000737:chemistry*; D001807:Blood Vessel Prosthesis; D008274:Magnesium / Q000737:chemistry*; D015607:Stents
chemical_list: D000497:Alloys; D008274:Magnesium
keywords: Mg alloy tubes; Microstructures; Processing; Tensile mechanical properties; Texture