The influence of hot-deformation on the microstructure,crystalline orientation,and texture evolution of Ti6Al4V-5Cu,an antibacterial(α+β)titanium alloy,was investigated.The alloy was deformed using a hot rolling pro...The influence of hot-deformation on the microstructure,crystalline orientation,and texture evolution of Ti6Al4V-5Cu,an antibacterial(α+β)titanium alloy,was investigated.The alloy was deformed using a hot rolling process in 15%,58%,and 73%thickness reduction ratios.It was found that the basal<α→>and pyramidal<c→+α→>type slip planes could be activated in theαphase,which dominated the deformation behavior of Ti6Al4V-5Cu alloy.Under various deformation conditions,the alloy revealed different microstructure features.On the 15%hot rolled alloy,the deformation was performed by the breakdown of priorβgrain boundaries(GBβ),which was attributed to the formation of coarseαgrains,rotated nearly 45°with respect to the transversal and rolling directions.The presence of different sub-structure geometries made the interior grain size distribution heterogeneous.On the 58%hot rolled alloy,Ti2Cu intermetallic compound was found at theα/βinterface.High-resolution transmission electron microscopy investigation showed the occurrence of grain rotation in different crystallographic directions.At room temperature,the percentage elongation(El)of the alloy reached 23.15%on the 58%hot rolled sample.On the 73%deformed alloy,refined and randomly oriented characteristics of grains were obtained due to higher thickness reduction,which resulted from the segregation of very fine granules.The influence of grain rotation during a hot rolling process revealed that theα/βtexture fiber separation angle to maintain the Burger orientation relationship of{0001}α//{110}βplanes decreased with increase of the thickness reduction ratio when Ti6Al4V-5Cu alloy was deformed by a hot rolling mechanism.Activation of tensile{1012}<1011>and compressive{1122}<1123>twins on the deformation of the alloy was also studied.展开更多
The aim of this work was to study the cytotoxicity of Ti–6 Al–4 V–5 Cu(TC4–Cu)alloy for dental applications and evaluate the cell viability of diff erent fabricated TC4–Cu alloys in contact with MC3 T3-E1 cells i...The aim of this work was to study the cytotoxicity of Ti–6 Al–4 V–5 Cu(TC4–Cu)alloy for dental applications and evaluate the cell viability of diff erent fabricated TC4–Cu alloys in contact with MC3 T3-E1 cells in vitro.Ti–6 Al–4 V(TC4)alloy was used as a negative control to evaluate the cytotoxicity level of TC4–Cu alloy so as to provide basic support for the dental clinical application.Control group TC4 and experimental group TC4–Cu with diff erent fabrications were incubated in the cell culture medium.The absorbance value of mouse osteoblast MC3 T3-E1 cells was detected by CCK-8 assay after 1,3 and 7 days,respectively.The relative proliferation rate of cells was calculated,and then the toxicity level was valued for each group.Cell morphology on the surface was also studied by observing the cytoskeleton through F-actin filament staining.The experimental results showed that the absorbance values for the experimental and the negative control groups were not same at diff erent time points.Compared with diff erent fabricated TC4–Cu alloys,the annealing-TC4–Cu alloy showed much better biocompatibility.The mouse osteoblast MC3 T3-E1 cells cultured with annealing-TC4–Cu,rolling-TC4–Cu and solution+aging-TC4–Cu have no toxic eff ects,and these alloys could promote the proliferation of mouse osteoblasts.展开更多
基金supported by the National Natural Science Foundation of China(No.51631009)the authors acknowledge the CAS-TWAS presidential scholarship program.
文摘The influence of hot-deformation on the microstructure,crystalline orientation,and texture evolution of Ti6Al4V-5Cu,an antibacterial(α+β)titanium alloy,was investigated.The alloy was deformed using a hot rolling process in 15%,58%,and 73%thickness reduction ratios.It was found that the basal<α→>and pyramidal<c→+α→>type slip planes could be activated in theαphase,which dominated the deformation behavior of Ti6Al4V-5Cu alloy.Under various deformation conditions,the alloy revealed different microstructure features.On the 15%hot rolled alloy,the deformation was performed by the breakdown of priorβgrain boundaries(GBβ),which was attributed to the formation of coarseαgrains,rotated nearly 45°with respect to the transversal and rolling directions.The presence of different sub-structure geometries made the interior grain size distribution heterogeneous.On the 58%hot rolled alloy,Ti2Cu intermetallic compound was found at theα/βinterface.High-resolution transmission electron microscopy investigation showed the occurrence of grain rotation in different crystallographic directions.At room temperature,the percentage elongation(El)of the alloy reached 23.15%on the 58%hot rolled sample.On the 73%deformed alloy,refined and randomly oriented characteristics of grains were obtained due to higher thickness reduction,which resulted from the segregation of very fine granules.The influence of grain rotation during a hot rolling process revealed that theα/βtexture fiber separation angle to maintain the Burger orientation relationship of{0001}α//{110}βplanes decreased with increase of the thickness reduction ratio when Ti6Al4V-5Cu alloy was deformed by a hot rolling mechanism.Activation of tensile{1012}<1011>and compressive{1122}<1123>twins on the deformation of the alloy was also studied.
基金financially supported by the National Natural Science Foundation of China(No.51631009)。
文摘The aim of this work was to study the cytotoxicity of Ti–6 Al–4 V–5 Cu(TC4–Cu)alloy for dental applications and evaluate the cell viability of diff erent fabricated TC4–Cu alloys in contact with MC3 T3-E1 cells in vitro.Ti–6 Al–4 V(TC4)alloy was used as a negative control to evaluate the cytotoxicity level of TC4–Cu alloy so as to provide basic support for the dental clinical application.Control group TC4 and experimental group TC4–Cu with diff erent fabrications were incubated in the cell culture medium.The absorbance value of mouse osteoblast MC3 T3-E1 cells was detected by CCK-8 assay after 1,3 and 7 days,respectively.The relative proliferation rate of cells was calculated,and then the toxicity level was valued for each group.Cell morphology on the surface was also studied by observing the cytoskeleton through F-actin filament staining.The experimental results showed that the absorbance values for the experimental and the negative control groups were not same at diff erent time points.Compared with diff erent fabricated TC4–Cu alloys,the annealing-TC4–Cu alloy showed much better biocompatibility.The mouse osteoblast MC3 T3-E1 cells cultured with annealing-TC4–Cu,rolling-TC4–Cu and solution+aging-TC4–Cu have no toxic eff ects,and these alloys could promote the proliferation of mouse osteoblasts.
