热挤压Zn-2Cu-0.5Zr合金的力学性能与降解行为
收稿日期: 2020-12-31
修回日期: 2021-03-06
网络出版日期: 2021-05-17
基金资助
国家重点研发计划项目(2016YFC1102500);四川省科技计划项目(2020YFH0077)
Mechanical Properties and Degradation Behavior of Hot-Extruded Zn-2Cu-0.5Zr Alloy
Received date: 2020-12-31
Revised date: 2021-03-06
Online published: 2021-05-17
Supported by
National Key Research and Development Program of China(2016YFC1102500);Science and Technology Program of Sichuan Province(2020YFH0077)
针对可降解锌基植入物面临的关键问题,制备了一种兼顾综合力学性能和降解行为的新型热挤压Zn-2Cu-0.5Zr (质量分数,%)合金。该合金的微观组织由Zn基体相、CuZn5相和Zn22Zr相构成。得益于均匀分布的第二相颗粒和基体相晶粒的进一步细化,热挤压Zn-2Cu-0.5Zr合金的综合力学性能显著优于Zn和Zn-2Cu合金,屈服强度、极限抗拉强度和断后延伸率分别提升至192 MPa、213 MPa和61%。此外,基体相晶粒的细化使得热挤压Zn-2Cu-0.5Zr合金表面生成的腐蚀产物层更加均匀致密,因而显著改善了基体的不均匀降解模式。
沈岗 , 张文泰 , 周超 , 纪焕中 , 罗恩 , 张海军 , 万国江 . 热挤压Zn-2Cu-0.5Zr合金的力学性能与降解行为[J]. 金属学报, 2022 , 58(6) : 781 -791 . DOI: 10.11900/0412.1961.2020.00537
Zinc possesses a moderate degradation rate compared to magnesium and iron. Accordingly, it has been studied as a biodegradable metal in recent years. However, its mechanical properties barely meet the clinical requirements of implant applications. Moreover, the non-uniform corrosion mode of zinc can result in the premature mechanical failure of the implants. In the present study, a hot-extruded Zn-2Cu-0.5Zr (mass fraction, %) alloy was fabricated with improved mechanical properties and degradation behavior suitable for implant use. The microstructure of the Zn-2Cu-0.5Zr alloy was composed of a Zn matrix, CuZn5 phase, and Zn22Zr phase. Owing to the evenly distributed second phase particles and refined grain size, the yield strength, ultimate tensile strength, and elongation of the hot-extruded Zn-2Cu-0.5Zr alloy were improved to 192 MPa, 213 MPa, and 61%, respectively, which were significantly higher than those of Zn and Zn-2Cu alloy. Furthermore, the refined grains also rendered a more uniform degradation mode to the Zn matrix than Zn and Zn-2Cu alloy. In conclusion, the hot-extruded Zn-2Cu-0.5Zr alloy may find promising applications in implants.
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