热处理对Mg-Zn-Ga可降解镁合金力学性能和腐蚀性能的影响
Effect of Heat Treatment on the Mechanical and Corrosion Properties of Mg-Zn-Ga Biodegradable Mg Alloys.
作者信息
Bazhenov Viacheslav, Lyskovich Anastasia, Li Anna, Bautin Vasily, Komissarov Alexander, Koltygin Andrey, Bazlov Andrey, Tokar Alexey, Ten Denis, Mukhametshina Aigul
机构信息
Casting Department, National University of Science and Technology "MISiS", 119049 Moscow, Russia.
Laboratory of Hybrid Nanostructured Materials, National University of Science and Technology "MISiS", 119049 Moscow, Russia.
出版信息
Materials (Basel). 2021 Dec 18;14(24):7847. doi: 10.3390/ma14247847.
Mg alloys have mechanical properties similar to those of human bones, and have been studied extensively because of their potential use in biodegradable medical implants. In this study, the influence of different heat treatment regimens on the microstructure and mechanical and corrosion properties of biodegradable Mg-Zn-Ga alloys was investigated, because Ga is effective in the treatment of disorders associated with accelerated bone loss. Solid-solution heat treatment (SSHT) enhanced the mechanical properties of these alloys, and a low corrosion rate in Hanks' solution was achieved because of the decrease in the cathodic-phase content after SSHT. Thus, the Mg-4 wt.% Zn-4 wt.% Ga-0.5 wt.% Y alloy after 18 h of SSHT at 350 °C (ultimate tensile strength: 207 MPa; yield strength: 97 MPa; elongation at fracture: 7.5%; corrosion rate: 0.27 mm/year) was recommended for low-loaded orthopedic implants.
镁合金具有与人体骨骼相似的机械性能，因其在可生物降解医用植入物中的潜在应用而受到广泛研究。在本研究中，研究了不同热处理方案对可生物降解Mg-Zn-Ga合金的微观结构、机械性能和腐蚀性能的影响，因为镓在治疗与加速骨质流失相关的疾病方面有效。固溶热处理（SSHT）提高了这些合金的机械性能，并且由于固溶热处理后阴极相含量的降低，在汉克斯溶液中实现了低腐蚀速率。因此，推荐在350°C下进行18小时固溶热处理后的Mg-4 wt.% Zn-4 wt.% Ga-0.5 wt.% Y合金用于低负荷骨科植入物（极限抗拉强度：207 MPa；屈服强度：97 MPa；断裂伸长率：7.5%；腐蚀速率：0.27 mm/年）。
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