Superelasticity, corrosion resistance and biocompatibility of the Ti-19Zr-10Nb-1Fe alloy.
Microstructure, mechanical properties, superelasticity and biocompatibility of a Ti-19Zr-10Nb-1Fe alloy are investigated. X-ray diffraction spectroscopy and transmission electron microscopy observations show that the as-cast Ti-19Zr-10Nb-1Fe alloy is composed of α' and β phases, but only the β phase exists in the as-rolled and as-quenched alloys. The tensile stress-strain tests indicate that the as-quenched alloy exhibits a good combination of mechanical properties with a large elongation of 25%, a low Young's modulus of 59 GPa and a high ultimate tensile stress of 723 MPa. Superelastic recovery behavior is found in the as-quenched alloy during tensile tests, and the corresponding maximum of superelastic strain is 4.7% at the pre-strain of 6%. A superelastic recovery of 4% with high stability is achieved after 10 cyclic loading-unloading training processes. Potentiodynamic polarization and ion release measurements indicate that the as-quenched alloy shows a lower corrosion rate in Hank's solution and a much less ion release rate in 0.9% NaCl solution than those of the NiTi alloys. Cell culture results indicate that the osteoblasts' adhesion and proliferation are similar on both the Ti-19Zr-10Nb-1Fe and NiTi alloys. A better hemocompatibility is confirmed for the as-quenched Ti-19Zr-10Nb-1Fe alloy, attributed to more stable platelet adhesion and small activation degree, and a much lower hemolysis rate compared with the NiTi alloy.
School of Materials Science and Engineering, Beihang University, Beijing 100191, China; Key Laboratory of Aerospace Materials and Performance (Ministry of Education), Beihang University, Beijing 100191, China.
Pengfei
P
Xue
School of Materials Science and Engineering, Beihang University, Beijing 100191, China; Key Laboratory of Aerospace Materials and Performance (Ministry of Education), Beihang University, Beijing 100191, China. Electronic address: liyan@buaa.edu.cn.
Yan
Y
Li
School of Materials Science and Engineering, Beihang University, Beijing 100191, China; Key Laboratory of Aerospace Materials and Performance (Ministry of Education), Beihang University, Beijing 100191, China.
Kangming
K
Li
Life Tech Scientific Corporation, Shenzhen 518057, China.
Deyuan
D
Zhang
School of Materials Science and Engineering, Beihang University, Beijing 100191, China.
Chungen
C
Zhou
D000497:Alloys / Q000494:pharmacology*; D000818:Animals; D001672:Biocompatible Materials / Q000494:pharmacology*; D001792:Blood Platelets / Q000187:drug effects / Q000648:ultrastructure; D016923:Cell Death / Q000187:drug effects; D048430:Cell Shape / Q000187:drug effects; D003343:Corrosion; D004548:Elasticity; D006461:Hemolysis / Q000187:drug effects; D006801:Humans; D007477:Ions; D008670:Metals; D010006:Osteoblasts / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D010973:Platelet Adhesiveness / Q000187:drug effects; D051381:Rats; D013314:Stress, Mechanical; D013696:Temperature; D013718:Tensile Strength / Q000187:drug effects; D014961:X-Ray Diffraction
D000497:Alloys; D001672:Biocompatible Materials; D007477:Ions; D008670:Metals; C000603140:Ti-19Zr-10Nb-1Fe alloy
Biocompatibility; Corrosion resistance; Shape memory alloy; Superelasticity; Ti–Zr–Nb–Fe