A new approach to plastic deformation of biodegradable zinc alloy with magnesium and its effect on microstructure and mechanical properties
A new approach to plastic deformation of biodegradable zinc alloy with magnesium and its effect on microstructure and mechanical properties
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DOI：
10.1016/j.matlet.2017.09.090
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发表时间：
2018-01-15
影响因子：
3
通讯作者：
Kulczyk, M.
中科院分区：
文献类型：
--
作者：
Jarzebska, A.;Bieda, M.;Kulczyk, M.
采用静液挤压法对含镁量为1%的可生物降解锌合金进行了塑性变形。研究了剧烈塑性变形对ZnMg合金组织和力学性能的影响。对均质化材料施加具有总真应变ε = 3.33的累积挤出。使用扫描电子显微镜（SEM）/电子背散射衍射（EBSD）方法进行的显微组织观察，以及静态拉伸试验，揭示了出色的结果。在变形之后，观察到导致材料显著强化的晶粒细化。获得了平均晶粒尺寸为700 nm、屈服强度为316 MPa、抗拉强度为435 MPa、抗弯强度（f）为35%的合金。这些结果表明，HE方法能够获得ZnMg的晶粒细化水平和机械性能，这是用常规塑性变形方法不可能实现的。HE后的锌合金性能满足生物可吸收支架应用的要求。(C)2017爱思唯尔B. V.保留所有权利。
The plastic deformation of biodegradable zinc alloy with 1 wt% of magnesium by hydrostatic extrusion (HE) was performed. The influence of severe plastic deformation on the microstructure and mechanical properties of ZnMg was investigated. Cumulative extrusion with total true strain epsilon = 3.33 was applied to the homogenised material. Microstructure observations carried out using scanning electron microscope (SEM)/ Electron Backscatter Diffraction (EBSD) methods, as well as static tensile tests, revealed outstanding results. After the deformation, grain refinement causing substantial strengthening of the material was observed. An average grain size equal to 700 nm and YS = 316 MPa, UTS = 435 MPa with epsilon(f) = 35% was obtained. These results indicate that the HE method enables the grain refinement level and mechanical properties of ZnMg to be obtained, which would not be possible with conventional methods of plastic deformation. The properties of the Zn alloy after HE satisfy the requirements for bioresorbable stent applications. (C) 2017 Elsevier B.V. All rights reserved.