The processing of ultrafine-grained Mg tubes for biodegradable stents

被引：88

作者：

Ge, Qiang ^{[1
]}

Dellasega, David ^{[2
]}

Demir, Ali Goekhan ^{[1
]}

Vedani, Maurizio ^{[1
]}

机构：

[1] Politecn Milan, Dept Mech Engn, I-20156 Milan, Italy

[2] Politecn Milan, Dept Energy, I-20156 Milan, Italy

来源：

ACTA BIOMATERIALIA | 2013年 / 9卷 / 10期

关键词：

Biodegradable stent; ECAP; Ultrafine grains; Mg alloy; Extrusion; MAGNESIUM ALLOY; MECHANICAL-PROPERTIES; MICROSTRUCTURE; EXTRUSION;

D O I：

10.1016/j.actbio.2013.01.010

中图分类号：

R318 [生物医学工程];

学科分类号：

0831 ;

摘要：

An investigation was carried out on equal-channel angular pressing (ECAP) and extrusion processing of a ZM21 Mg alloy to obtain an improved candidate material for the manufacturing of biodegradable Mg stents. Ultrafine-grain size billets of the ZM21 alloy were obtained by two-stage ECAP aimed at achieving an initial refining of the structure at 200 degrees C and then reaching the submicrometer grain size range by lowering the processing temperature down to 150 degrees C. The investigation revealed a significant improvement in the properties of the ECAP-treated samples compared with the starting coarse-grained ZM21 alloy. The 0.2% yield strength rose from 180 to 340 MPa after 150 degrees C ECAP processing, while maintaining a fairly high tensile ductility. The ultrafine ZM21 alloy billets were then used for the extrusion of stent precursors having the form of small-size tubes. The grain size after extrusion remained in the submicrometer range while the hardness was revealed to be significantly higher than that of the coarse-grained ZM21 Mg alloy. It was demonstrated that processing of biodegradable Mg stent having an ultrafine-grained microstructure by ECAP and low-temperature extrusion is feasible and that the obtained products feature promising properties. (C) 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：8604 / 8610

页数：7

共 27 条

[11] DYNAMIC RECRYSTALLIZATION AND THE DEVELOPMENT OF MICROSTRUCTURE DURING THE HIGH-TEMPERATURE DEFORMATION OF MAGNESIUM [J].

ION, SE ;

HUMPHREYS, FJ ;

WHITE, SH .

ACTA METALLURGICA, 1982, 30 (10) :1909-1919

[12] Principle of equal-channel angular pressing for the processing of ultra-fine grained materials [J].

Iwahashi, Y ;

Wang, JT ;

Horita, Z ;

Nemoto, M ;

Langdon, TG .

SCRIPTA MATERIALIA, 1996, 35 (02) :143-146

[13] Microstructure evolution of AZ31 Mg alloy during equal channel angular extrusion [J].

Jin, Li ;

Lin, Dongliang ;

Mao, Dali ;

Zeng, Xiaoqing ;

Chen, Bin .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2006, 423 (1-2) :247-252

[14] Texture development and its effect on mechanical properties of an AZ61 Mg alloy fabricated by equal channel angular pressing [J].

Kim, WJ ;

Hong, SI ;

Kim, YS ;

Min, SH ;

Jeong, HT ;

Lee, JD .

ACTA MATERIALIA, 2003, 51 (11) :3293-3307

[15] Long-term biodegradation and associated hydrogen evolution of duplex-structured Mg-Li-Al-(RE) alloys and their mechanical properties [J].

Leeflang, M. A. ;

Dzwonczyk, J. S. ;

Zhou, J. ;

Duszczyk, J. .

MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS, 2011, 176 (20) :1741-1745

[16] Developing superplasticity in a magnesium alloy through a combination of extrusion and ECAP [J].

Matsubara, K ;

Miyahara, Y ;

Horita, Z ;

Langdon, TG .

ACTA MATERIALIA, 2003, 51 (11) :3073-3084

[17] Equal channel angular extrusion: from macromechanics to structure formation [J].

Segal, VM .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1999, 271 (1-2) :322-333

[18] Bulk nanostructured materials from severe plastic deformation [J].

Valiev, RZ ;

Islamgaliev, RK ;

Alexandrov, IV .

PROGRESS IN MATERIALS SCIENCE, 2000, 45 (02) :103-189

[19] Effects of RE on the microstructure and mechanical properties of Mg-8Zn-4Al magnesium alloy [J].

Wang, YX ;

Guan, SK ;

Zeng, XQ ;

Dine, WJ .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2006, 416 (1-2) :109-118

[20] The history of biodegradable magnesium implants: A review [J].

Witte, Frank .

ACTA BIOMATERIALIA, 2010, 6 (05) :1680-1692

← 1 2 3 →