Impact of ruthenium on microstructure and corrosion behavior of β-type Ti-Nb-Ru alloys for biomedical applications

被引：40
作者：
Biesiekierski, Arne [1 ,2 ]
Ping, D. H. [2 ]
Yamabe-Mitarai, Y. [2 ]
Wen, Cuie [1 ]
机构：
[1] Swinburne Univ Technol, Fac Engn & Ind Sci, Hawthorn, Vic 3122, Australia
[2] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050047, Japan
来源：
MATERIALS & DESIGN | 2014年 / 59卷
基金：
澳大利亚研究理事会;
关键词：
beta-Titanium alloys; Biomaterials; Corrosion; Microstructure; Transmission electron microscopy; SHAPE-MEMORY; TITANIUM-ALLOYS; NICKEL-TITANIUM; CYTOTOXICITY; RESISTANCE; NIOBIUM; FATIGUE; CP;
D O I：
10.1016/j.matdes.2014.02.058
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Corrosion behavior and microstructure of as-cast metastable 3-type Ti-20Nb-xRu (x = 0, 0.5, 1.0, 1.5 at.%) have been investigated using linear polarization and transmission electron microscopy (TEM), respectively. Ruthenium (Ru) was confirmed to be a beta-phase stabilizer as a titanium (Ti) alloying element which served to suppress both omega precipitation and elemental segregation; the prominence and degree of elemental segregation between the Nb-rich primary dendrites and the interdendritic areas rapidly decreased with minor Ru addition, yielding a more homogenous microstructure overall. Additionally, even minimal Ru additions significantly altered the corrosion potential (E-corr), yielding a 0.3 V shift in the noble direction over the Ru-free controls, along with a comparable shift in the potential at which the initial passive region begins to fail (E-inc). The present result suggests Ru addition can confer a greater resistance to corrosion in beta-Ti alloys. Crown Copyright (C) 2014 Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：303 / 309
页数：7
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