Corrosion resistance of pure titanium（Grade 2） and Ti-Pd alloy（Grade 7） was studied using the electrochemical techniques of potentiodynamic measurements and electrochemical impedance spectroscopy（EIS）.Measuremen...Corrosion resistance of pure titanium（Grade 2） and Ti-Pd alloy（Grade 7） was studied using the electrochemical techniques of potentiodynamic measurements and electrochemical impedance spectroscopy（EIS）.Measurements were performed at the temperature of 36.6 ℃ in two solutions：PBS solution with pH of 7.4 simulating conditions of healthy human body,and PBS solution with pH of 5.2 and with the addition of hydrogen peroxide（0.015 mol/L） simulating the inflammatory state.It is found that,Ti Grade 7 can be a good candidate as a material for orthopedic implant application,because its corrosion resistance in the PBS solution containing H2O2 is better（lower corrosion current densities） than that of pure titanium.展开更多
The effect of thermal cycling and aging in martensitic state in Ti-Pd-Ni alloys were investigated by DSC and TEM observations. It is shown that the thermal cycling causes the decreases in M, and Af temperatures in Ti5...The effect of thermal cycling and aging in martensitic state in Ti-Pd-Ni alloys were investigated by DSC and TEM observations. It is shown that the thermal cycling causes the decreases in M, and Af temperatures in Ti50Pd50-xNix (x=10, 20, 30) alloys, but no obvious thermal cycling effect was observed in Ti50Pd50Pd40Ni10 alloys and the aging effect shows a curious feature, i.e., the Af temperature does not saturate even after relatively long time aging, which is considered to be due to the occurrence of recovery recrystallization during aging.展开更多
The amorphous Ti_(l_x)Pd_x alloys within a wider composition range of 0.25<x<0.6 have been prepared using sputter-deposition method on the liquid-nitrogen-cooled substrates.The for- mation of amorphous Ti-Pd all...The amorphous Ti_(l_x)Pd_x alloys within a wider composition range of 0.25<x<0.6 have been prepared using sputter-deposition method on the liquid-nitrogen-cooled substrates.The for- mation of amorphous Ti-Pd alloys relates to the topologically close-packed intermetallic compounds existing in the equilibrium phase diagram.These amorphous Ti-Pd alloys are identified by differential scanning calorimetry that the crystallization begins at about 700 K. The insensitive dependence of the crystallization temperature on composition of the alloys is explained with a model proposed by Miedema and Buschow.The electric resistivity of the amorphous Ti-Pd alloys in the range of 4.2 to 270 K decreases monotonously with in- creasing temperature.展开更多
基金supported by the Polish Ministry of Science and Higher Education under grant No.N507 190 32/2954
文摘Corrosion resistance of pure titanium（Grade 2） and Ti-Pd alloy（Grade 7） was studied using the electrochemical techniques of potentiodynamic measurements and electrochemical impedance spectroscopy（EIS）.Measurements were performed at the temperature of 36.6 ℃ in two solutions：PBS solution with pH of 7.4 simulating conditions of healthy human body,and PBS solution with pH of 5.2 and with the addition of hydrogen peroxide（0.015 mol/L） simulating the inflammatory state.It is found that,Ti Grade 7 can be a good candidate as a material for orthopedic implant application,because its corrosion resistance in the PBS solution containing H2O2 is better（lower corrosion current densities） than that of pure titanium.
基金This work was supported by a Grant-in-Aid fOrEncouragement of Young Scientists (W.C.) (l998-1999) from the Ministry of Educat
文摘The effect of thermal cycling and aging in martensitic state in Ti-Pd-Ni alloys were investigated by DSC and TEM observations. It is shown that the thermal cycling causes the decreases in M, and Af temperatures in Ti50Pd50-xNix (x=10, 20, 30) alloys, but no obvious thermal cycling effect was observed in Ti50Pd50Pd40Ni10 alloys and the aging effect shows a curious feature, i.e., the Af temperature does not saturate even after relatively long time aging, which is considered to be due to the occurrence of recovery recrystallization during aging.
文摘The amorphous Ti_(l_x)Pd_x alloys within a wider composition range of 0.25<x<0.6 have been prepared using sputter-deposition method on the liquid-nitrogen-cooled substrates.The for- mation of amorphous Ti-Pd alloys relates to the topologically close-packed intermetallic compounds existing in the equilibrium phase diagram.These amorphous Ti-Pd alloys are identified by differential scanning calorimetry that the crystallization begins at about 700 K. The insensitive dependence of the crystallization temperature on composition of the alloys is explained with a model proposed by Miedema and Buschow.The electric resistivity of the amorphous Ti-Pd alloys in the range of 4.2 to 270 K decreases monotonously with in- creasing temperature.
