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首页> 外文期刊>Materials Science and Engineering >Effect of equal-channel angular pressing on microstructural evolution, mechanical property and biodegradability of an ultrafine-grained zinc alloy
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Effect of equal-channel angular pressing on microstructural evolution, mechanical property and biodegradability of an ultrafine-grained zinc alloy

机译：等通道角度压制对超环盐锌合金的微观结构演化，力学性能和生物降解性的影响

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摘要

Zinc alloys have become one of the most promising material groups for biodegradable medical implants due to their desirable degradability, excellent biocompatibility, unique atherosclerotic resistance, and modest mechanical performance. Grain refinement is an important strengthening mechanism for such an alloy system to improve the mechanical properties. In the present work, an ultrafine-grained (UFG) zinc alloy (Zn-0.033 Mg, in wt.%) was fabricated by equal-channel angular pressing (ECAP) process. The effect of the ECAP process on microstructural evolution, mechanical properties, and biodegradability of the material was investigated. The results indicated that a large number of sub-boundary and recrystallized-grain structures were generated by continuous and discontinuous dynamic recrystallization during severe plastic deformation. Grain size was significantly refined to an average grain size of 1.36 ± 0.90 urn, and the percentage of grains below 1 pm reached 37.4% after 12 ECAP passes. Simultaneously, the texture was changed from the extrusion direction (ED)‖< 0001 > fiber texture to a texture with ED deviating 70 ± 5° away from <0001 >. Due to the synergy effect of grain refinement and texture, as well as dislocation strengthening, the yield strength was enhanced to 276 ± 3 MPa after 12 ECAP passes. However, this was inevitably accompanied by a sacrifice of elongation (8.17 ± 1.21%). Therefore, an optimal combination of yield strength (250 ± 22 MPa) and elongation (25.37 ± 0.79%) at room temperature was obtained after 4 ECAP passes. Moreover, a low corrosion rate of 0.004-0.01 mm/year in the UFG Zn-0.033 Mg alloy fabricated by ECAP was achieved, which fully satisfies the requirements for biodegradable implant materials.
机译：由于其所需的降解性，优异的生物相容性，独特的动脉粥样硬化和适度的机械性能，锌合金已成为可生物降解的医疗植入物最有希望的材料组之一。晶粒细化是这种合金系统改善机械性能的重要强化机制。通过同等通道角压（ECAP）工艺，制造在本作本作的情况下，通过等通道角压（ECAP）工艺制造超细晶粒（UFG）锌合金（Zn-0.033mg，Zn-0.033mg。研究了ECAP工艺对材料的微观结构演化，机械性能和生物降解性的影响。结果表明，在严重的塑性变形期间通过连续和不连续的动态再结晶产生大量的亚边界和再结晶晶粒结构。晶粒尺寸明显精制到平均粒度为1.36±0.90瓮，12个ECAP通过后1 PM低于1 PM的百分比达到37.4％。同时，纹理从挤出方向（ED）‖+纤维纹理变为纤维纹理，以偏离距<0001>的ED偏离70±5°。由于晶粒细化和质地的协同效应，以及脱位强化，12个ECAP通过后屈服强度增强至276±3MPa。然而，这不可避免地伴有伸长率（8.17±1.21％）。因此，在4个ECAP通过后，获得了室温下屈服强度（250±22MPa）和伸长率（25.37±0.79％）的最佳组合。此外，实现了由ECAP制造的UFG Zn-0.033mg合金中0.004-0.01mm /毫米/毫克合金的低腐蚀速率，这完全满足了可生物降解的植入材料的要求。

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