Microstructure and metallic ion release of pure titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion
Microstructure and metallic ion release of pure titanium and Ti-13Nb-13Zr alloy processed by high pressure torsion
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DOI：
10.1016/j.matdes.2015.11.088
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发表时间：
2016-02-05
影响因子：
8.4
通讯作者：
Bugarski, Branko
中科院分区：
文献类型：
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作者：
Dimic, Ivana;Cvijovic-Alagic, Ivana;Bugarski, Branko
金属生物材料的力学性能可以通过剧烈塑性变形获得晶粒细化来实现。本研究的目的是测定经高压扭转（HPT）处理的商业纯钛（CPTi）和Ti-13Nb-13Zr合金的金属离子释放量。采用扫描电镜和透射电镜观察了材料在初始状态和HPT变形后的显微组织。测定了超细晶（UFG） CPTi和Ti-13Nb-13Zr合金的圆盘状试样的显微硬度，以评价hpt加工材料的均匀性。用电感耦合等离子体质分光光度计测定样品在37℃人工唾液中浸泡7天后的离子释放量。并对人工唾液pH值对金属离子释放的影响进行了评价。结果表明，高温高压铸造UFG CPTi和Ti-13Nb-13Zr合金的离子释放量高于传统铸造CPTi和Ti-13Nb-13Zr合金的离子释放量。这一现象可以解释为HPT工艺使金属离子容易从晶粒较小的微观结构中释放出来。(C) 2015 Elsevier Ltd.版权所有。
Significant enhancement of mechanical properties of metallic biomaterials can be achieved by grain refinement obtained by severe plastic deformation. The purpose of this study was to determine metallic ion release from commercially pure titanium (CPTi) and Ti-13Nb-13Zr alloy processed by high pressure torsion (HPT). The materials microstructures, in the initial state and after HPT deformation, were examined by scanning and transmission electron microscopy. The microhardness was determined along the radius of the disc-shaped samples of ultrafine-grained (UFG) CPTi and Ti-13Nb-13Zr alloy in order to evaluate homogeneity of HPT-processed materials. The quantities of released ions were determined using inductively coupled plasma-mass spectrophotometer for samples immersed in artificial saliva at 37 degrees C for 7 days. Also, the effect of artificial saliva pH value on metallic ion release was estimated. Obtained results revealed that the quantities of released ions from UFG CPTi and Ti-13Nb-13Zr alloy obtained by HPT process were higher than the quantities of released ions from CPTi and Ti-13Nb-13Zr alloy produced by traditional casting. This behavior can be explained by the fact that metallic ions are easily released from microstructure with smaller grains achieved by HPT process. (C) 2015 Elsevier Ltd. All rights reserved.