J0401-3-4 生体用Ti-29Nb-13Ta-4.6Zr合金の機械的特性に及ぼすレアケース酸化物の影響(生体材料およびその表面改質材(3))

概要

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Various additions of TiB_2 and Y_2O_3 were added to the β-type Ti-29Nb-13Ta-4.6Zr alloy (TNTZ) in order to achieve excellent mechanical performance as well as lower Young's modulus. All the alloys are found to be composted of β phase by XRD analysis. A small amount of TiB and Y_2O_3 precipitates in these alloys, respectively. The grain sizes of TNTZ with TiB_2 and Y_2O_3 additions become smaller than TNTZ without them. Young's moduli of TNTZ with TiB_2 and Y_2O_3 additions keep low, and are almost same as that of TNTZ without them. The tensile strength of TNTZ is successfully improved, while the elongation decreases with the increasing of the amount of TiB_2 or Y_2O_3 additions. The improvement of the tensile strength of TNTZ with TiB_2 or Y_2O_3 additions is attributed to the microstructure refinement and dispersion strengthening due to TiB and Y_2O_3.
社団法人日本機械学会の論文
2009-09-12