摘要
通过光学显微镜(OM)、扫描电子显微镜(SEM)、浸泡实验、电化学测试和拉伸试验研究了微合金化处理对生物材料镁合金的耐蚀性能和力学性能的影响。结果表明,随着Zn、Zr、Dy元素的添加,镁合金的晶粒得以细化,合金内部第二相生成并长大。将元素Zn、Zr、Dy同时添加到镁合金中时,合金的晶粒尺寸从1087μm减小到70μm,显微组织也变得更均匀。此外,添加Zn、Zr、Dy元素可显著改善镁合金的耐腐蚀性和力学性能。根据浸泡实验可知,添加不同元素后,合金的腐蚀速率从2.01 mm/a降低至0.92 mm/a;自腐蚀电流密度从4.22μA/cm^(2)降低至2.05μA/cm^(2);屈服强度、极限抗拉伸强度和伸长率从30.5 MPa、69.5 MPa和6%增加到84 MPa、154 MPa和8.6%。
The effects of micro-alloying treatment on corrosion resistance and mechanical properties of biomaterial magnesium alloy were investigated by optical microscope(OM),scanning electron microscope(SEM),immersion test,electrochemical test,and tensile test.The results show that after successively adding Zn,Zr,and Dy,the grain of magnesium alloys is refined and the second phase is generated and grows up.When Zn,Zr,and Dy are simultaneously added into magnesium alloy,the grain size of alloy is decreased from 1087μm to 70μm and the microstructure becomes more uniform.Moreover,the addition of Zn,Zr,and Dy significantly improves the corrosion resistance and mechanical properties of magnesium alloy:the corrosion rate decreases from 2.01 mm/a to 0.92 mm/a;the self-corrosion current density decreases from 4.22μA/cm^(2) to 2.05μA/cm^(2);the yield strength,ultimate tensile strength,and elongation increase from 30.5 MPa,69.5 MPa,and 6%to 84 MPa,154 MPa,and 8.6%,respectively.
作者
师慧娜
贺俊光
文九巴
李欢
田培梧
Shi Huina;He Junguang;Wen Jiuba;Li Huan;Tian Peiwu(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Collaborative Innovation Center of Nonferrous Metals,Luoyang 471023,China;Provincial and Ministry Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology,Luoyang 471023,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2021年第11期3871-3878,共8页
Rare Metal Materials and Engineering
基金
Foundation of Henan Educational Committee(20A430010)。
关键词
元素添加
镁合金
耐蚀性能
力学性能
element addition
magnesium alloys
corrosion resistance
mechanical property
