于泽群,董月成,牛京喆,李鑫,常辉,周廉.生物医用超细晶Ti-6Al-7Nb合金腐蚀性能研究[J].稀有金属材料与工程,0,():-.[Yu Zequn,Dong Yuecheng,Niu jingzhe,Li Xin,Chang Hui,Zhou Lian.Study on Microstructure and Corrosion Behavior of Biomedical Ultrafine-grained Ti-6Al-7Nb Alloy[J].Rare Metal Materials and Engineering,0,():-].
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生物医用超细晶Ti-6Al-7Nb合金腐蚀性能研究
投稿时间:2020-05-31  修订日期:2020-06-30
中文关键词:  Ti-6Al-7Nb  超细晶  钝化膜  耐腐蚀性能
基金项目:国家自然科学基金(No.51931008);中国博士后科学基金(No. 2017M623392);海洋装备用金属材料及其应用国家重点实验室开放基金(No.SKLMEA-K201807);江苏高校优势学科建设工程资助项目(PAPD);江苏省基础研究与发展计划(No.BE2019119)
中文摘要:
      本文利用等径角变形(equal channel angular pressing, ECAP)的方法制备了平均晶粒尺寸400 nm的超细晶(ultrafine-grained,UFG)生物医用Ti-6Al-7Nb合金,通过热处理获得亚微米和微米级的粗晶样品,不同晶粒尺寸样品在Ringer’s溶液中的电化学行为表明:相比于粗晶态,超细晶Ti-6Al-7Nb具有更低的腐蚀电流密度和更高的极化电阻,表现出更优异的耐腐蚀性能,这主要归因于超细晶Ti-6Al-7Nb样品具有更高的晶界密度及位错密度,更有利于表面钝化膜的均匀快速成核,从而抑制点蚀的生成和扩展。通过X射线光电子能谱(XPS)对表面钝化膜的化学成分进行分析,发现不同厚度下超细晶Ti-6Al-7Nb合金具有更高的TiO2及Nb2O5,从而使钝化膜具有更好的致密性,改善了耐腐蚀性能。
Study on Microstructure and Corrosion Behavior of Biomedical Ultrafine-grained Ti-6Al-7Nb Alloy
英文关键词:Ti-6Al-7Nb  ultrafine-grained (UFG)  passivation film  corrosion resistance
英文摘要:
      In this research, the ultrafine-grained (UFG) biomedical Ti-6Al-7Nb alloy with average grain size of 400nm was fabricated by equal channel angular pressing (ECAP), after that, coarse grained samples of Ti-6Al-7Nb with submicron and micron size were prepared by further heat treatment. The electrochemical behavior of samples with different grain sizes in Ringer’s solution shows that: compared with the coarse grained state, UFG Ti-6Al-7Nb possesses a better corrosion resistance because it has lower corrosion current density and higher polarization resistance. It can be attributed to the higher grain boundary density and dislocation density of UFG Ti-6Al-7Nb samples, this will make the sample to form an uniform passivation film much quickly, thus inhibiting the formation and expansion of pitting. The chemical composition of the surface passivation film was analyzed by X-ray photoelectron spectroscopy (XPS), and it was found that UFG Ti-6Al-7Nb has higher percentage content of TiO2 and Nb2O5 on the different depths of the passivation film, thus making a compactness of its passivation film and leading to a better corrosion resistance. Key words: Ti-6Al-7Nb; ultrafine-grained (UFG); passivation film; corrosion resistance
作者单位
于泽群 南京工业大学 材料科学与工程学院/新材料研究院 
董月成 南京工业大学 材料科学与工程学院/新材料研究院 
牛京喆 西安交通大学 金属材料强度国家重点实验室 
李鑫 南京工业大学 材料科学与工程学院/新材料研究院 
常辉 南京工业大学 材料科学与工程学院/新材料研究院 
周廉 南京工业大学 材料科学与工程学院/新材料研究院 
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