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Novel Ti-Ta-Hf-Zr alloys with promising mechanical properties for prospective stent applications.

ABSTRACT: Titanium alloys are receiving increasing research interest for the development of metallic stent materials due to their excellent biocompatibility, corrosion resistance, non-magnetism and radiopacity. In this study, a new series of Ti-Ta-Hf-Zr (TTHZ) alloys including Ti-37Ta-26Hf-13Zr, Ti-40Ta-22Hf-11.7Zr and Ti-45Ta-18.4Hf-10Zr (wt.%) were designed using the d-electron theory combined with electron to atom ratio (e/a) and molybdenum equivalence (Mo_eq) approaches. The microstructure of the TTHZ alloys were investigated using optical microscopy, XRD, SEM and TEM and the mechanical properties were tested using a Vickers micro-indenter, compression and tensile testing machines. The cytocompatibility of the alloys was assessed using osteoblast-like cells in vitro. The as-cast TTHZ alloys consisted of primarily ? and ? nanoparticles and their tensile strength, yield strength, Young's modulus and elastic admissible strain were measured as being between 1000.7-1172.8 MPa, 1000.7-1132.2 MPa, 71.7-79.1 GPa and 1.32-1.58%, respectively. The compressive yield strength of the as-cast alloys ranged from 1137.0 to 1158.0 MPa. The TTHZ alloys exhibited excellent cytocompatibility as indicated by their high cell viability ratios, which were close to that of CP-Ti. The TTHZ alloys can be anticipated to be promising metallic stent materials by virtue of the unique combination of extraordinarily high elastic admissible strain, high mechanical strength and excellent biocompatibility.

SUBMITTER: Lin J

PROVIDER: S-EPMC5126583 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature

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Novel Ti-Ta-Hf-Zr alloys with promising mechanical properties for prospective stent applications.

Lin Jixing J Ozan Sertan S Li Yuncang Y Ping Dehai D Tong Xian X Li Guangyu G Wen Cuie C

Scientific reports 20161129

Titanium alloys are receiving increasing research interest for the development of metallic stent materials due to their excellent biocompatibility, corrosion resistance, non-magnetism and radiopacity. In this study, a new series of Ti-Ta-Hf-Zr (TTHZ) alloys including Ti-37Ta-26Hf-13Zr, Ti-40Ta-22Hf-11.7Zr and Ti-45Ta-18.4Hf-10Zr (wt.%) were designed using the d-electron theory combined with electron to atom ratio (e/a) and molybdenum equivalence (Mo<sub>eq</sub>) approaches. The microstructure o ...[more]

PMID: 27897215

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Project description:High-hardness materials with ductile deformation behavior have recently piqued interest due to their prospective applications, particularly as hard and protective coatings. The crack formation, especially in metal and ceramic materials, is one of the biggest problems of the surface hard coatings on heavy-duty tools. In this regard, mechanical properties (Vickers hardness, fracture toughness, machinability index, index of brittleness, as well as Pugh's ratio) have been studied for the metallic boro-carbides of A2BC (A = Ti, Zr, Hf, and W) compounds using the state-of-the-art density functional theory in detail. The compounds under investigation are both thermodynamically and mechanically stable. The value of Vickers hardness (in GPa) for A2BC (A = Ti, Zr, Hf, and W) compounds are 28.20, 23.12, 12.44, and 35.70, respectively, which indicates the W2BC could be a member of the hard family (H v > 30 GPa). Pugh's ratio suggests ductile deformation for the W2BC compound, whereas the other three (Ti2BC, Zr2BC, and Hf2BC) compounds exhibit brittle deformation behavior. The W2BC compounds have the highest ductility among the other metallic boro-carbides (M2BC; M = V, Nb, Mo and Ta) and some other benchmark coating materials (TiN, TiAlN, C-BN, and Cr0.5Al0.5N). The fracture toughness (K IC) values are in the following sequence: Zr2BC < Ti2BC < Hf2BC < W2BC, which indicates that, the highest resistance (K IC = 4.96 MPam1/2) found for W2BC is suitable to prevent the crack propagation within the solid. In addition, the structural, electronic, optical, and thermal properties are also investigated for the A2BC (A = Ti, Zr, Hf, and W) compounds. The Ti2BC (W2BC) reflectivity spectra never fall below 53 (45)% in the 0 to 10.3 eV (0 to 16.70 eV) photon energy range, suggesting that these compounds have promise for usage as coating materials to reduce solar heating. Hf2BC and W2BC compounds could also be exploited as promising thermal barrier coating materials, while Ti2BC could be used as heat sink material based on the results of Debye temperature, melting temperature, thermal conductivity, and thermal expansion coefficient. The electronic properties reveal the metallic behavior of these compounds. The results obtained here are compared with those of some commercially known compounds, where available.

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Novel Ti-Ta-Hf-Zr alloys with promising mechanical properties for prospective stent applications.

Publications

Novel Ti-Ta-Hf-Zr alloys with promising mechanical properties for prospective stent applications.

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