Sn元素对Mg-Zn-Ca合金非晶形成能力和耐蚀性的影响
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摘要
采用熔体旋淬和铜模喷铸法制备了不同Sn含量的Mg-Zn-Ca-Sn合金带材和直径2 mm的棒材试样。运用XRD、SEM、DSC和电化学测试方法研究了Sn元素对Mg-Zn-Ca合金非晶形成能力和在模拟体液中腐蚀行为的影响。结果表明,带材组织均为非晶态,而棒材试样随着Sn含量的增加,由不含Sn元素的完全非晶态,逐渐转变为由Mg和Mg2Sn相组成的多晶态组织,说明Sn元素的添加恶化了Mg-Zn-Ca合金的非晶形成能力。电化学腐蚀测试结果表明随着Sn含量的增多,腐蚀电位负向移动,腐蚀电流密度增大,合金的耐蚀性逐渐下降。
Ribbon and rod( 2 mm in diameter) samples of Mg-Zn-Ca-Sn alloys were prepared by melt-spinning and copper mould injection. Effect of Sn addition on glass forming ability and bio-corrosion behavior in simulated body fluids of Mg-Zn-Ca alloys was studied by means of X-ray diffraction,scanning electron microscopy,differential scanning calorimeter and electrochemical test. The results show that with the increasing content of Sn element,all ribbon samples are in completely amorphous state. However,the microstructure of 2 mm rod samples transforms from fully amorphous to almost polycrystalline state with precipitates Mg and Mg_2Sn phases. It indicates that the addition of Sn decreases the glass forming ability of the Mg_(65)Zn_(30)Ca_5 alloy. The results of electrochemical test demonstrate that Sn-doped samples exhibit more negative corrosion potential and larger corrosion current density,which suggests that the corrosion resistance decreases with increasing content of Sn element.
Ribbon and rod( 2 mm in diameter) samples of Mg-Zn-Ca-Sn alloys were prepared by melt-spinning and copper mould injection. Effect of Sn addition on glass forming ability and bio-corrosion behavior in simulated body fluids of Mg-Zn-Ca alloys was studied by means of X-ray diffraction,scanning electron microscopy,differential scanning calorimeter and electrochemical test. The results show that with the increasing content of Sn element,all ribbon samples are in completely amorphous state. However,the microstructure of 2 mm rod samples transforms from fully amorphous to almost polycrystalline state with precipitates Mg and Mg_2Sn phases. It indicates that the addition of Sn decreases the glass forming ability of the Mg_(65)Zn_(30)Ca_5 alloy. The results of electrochemical test demonstrate that Sn-doped samples exhibit more negative corrosion potential and larger corrosion current density,which suggests that the corrosion resistance decreases with increasing content of Sn element.
引文
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[9]Gu X,Zheng Y,Zhong S,et al.Corrosion of,and cellular responses to Mg-Zn-Ca bulk metallic glasses[J].Biomaterials,2010,31(6):1093-1103.
[10]Zberg B,Uggowitzer P J,L9ffler J F.Mg Zn Ca glasses without clinically observable hydrogen evolution for biodegradable implants[J].Nature Materials,2009,8(11):887-91.
[11]Li H,Pang S,Liu Y,et al.Biodegradable Mg-Zn-Ca-Sr bulk metallic glasses with enhanced corrosion performance for biomedical applications[J].Materials&Design,2015,67:9-19.
[12]Ramya M,Sarwat S G,Udhayabanu V,et al.Role of partially amorphous structure and alloying elements on the corrosion behavior of Mg-Zn-Ca bulk metallic glass for biomedical applications[J].Materials&Design,2015,86:829-835.
[13]Kailath A J.The effect of Sn addition on the crystallization and thermal stability of Cu-Zr-Ti metallic glasses[J].Journal of Alloys and Compounds,2012,53(7):275-279.
[14]Zhang Z Y,Wu Y,Zhou J,et al.Effects of Sn addition on phase formation and mechanical properties of Ti Cu-based bulk metallic glass composites[J].Intermetallics,2013,42(11):68-76.
[15]刘西伟.Mg-3Sn-0.5Mn合金的降解行为及生物相容性[D].哈尔滨:哈尔滨工程大学,2003.LIU Xi-wei.Biodegradation and biocompatibility evaluation of Mg-3Sn-0.5Mn alloy[D].Harbin:Harbin Engineering University,2003.
[16]Kakubo T,Takadama H.How useful is SBF in predicting in vivo bone bioactivity?[J].Biomaterials,2006,27:2907-2915.
[17]Inoue A.Stabilization of metallic supercooled liquid and bulk amorphous alloys[J].Acta Materialia,2000,48(1):279-306.
[18]Turnbull D.Under what conditions can a glass be formed?[J].Contemporary Physics,1969,10(5):473-488.
[19]Lu Z P,Liu C T.A new glass-forming ability criterion for bulk metallic glasses[J].Acta Materialia,2002,50(13):3501-3512.
[20]王嵬,王楠,张万友,等.Co-Fe-Gd合金系非晶形成能力的热力学研究[J].材料热处理学报,2013,34(12):196-200.WANG Wei,WANG Nan,ZHANG Wan-you,et al.Thermodynamic investigation on glass forming ability of Co-Fe-Gd alloy system[J].Transactions of Materials and Heat Treatment,2013,34(12):196-200.
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[24]Wang J F,Li Y,Huang S,et al.Effects of Y on the microstructure,mechanical and bio-corrosion properties of Mg-Zn-Ca bulk metallic glass[J].Journal of Materials Science&Technology,2014,30(12):1255-1261.