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• W2000641551 abstract "A novel β-type titanium alloy, Ti–29Nb–13Ta–4.6Zr (TNTZ), has been developed as a candidate for biomedical applications. TNTZ exhibits non-toxicity and a low Young’s modulus close to that of bone (10–30 GPa). Such a low Young’s modulus of this alloy is achieved by comprising a single metastable β phase. Greater mechanical biocompatibility, which implies higher mechanical strength and hardness while maintaining a low Young’s modulus, has been aimed for TNTZ. Therefore, strengthening by grain refinement and increasing dislocation density is expected to provide TNTZ high mechanical strength while keeping a low Young’s modulus because they keep the original β phase. In this case, high-pressure torsion (HPT) processing is one of the effective ways to obtain these properties simultaneously in TNTZ. Thus, in this study, the effect of HPT processing on the microstructure and mechanical hardness of TNTZ was systematically investigated at rotation numbers (N) of 1 to 20 under a pressure of around 1.25 GPa at room temperature. On the cross sections of TNTZ subjected to HPT processing (TNTZHPT) after cold rolling (TNTZCR) at any rotation number, a heterogeneous microstructure consisting of a matrix and a non-etched band, which is not corroded by etching solution, can be observed. The thickness of non-etched band increases as rotation number and distance from specimen center increase. Both matrix and non-etched band comprise a single β phase, but their grain geometries are different each other. Equiaxed grains and elongated grains are observed in the matrix and the non-etched band, respectively. The equiaxed grain diameter, which is ranged from 155 nm to 44 nm, in the matrix decreases with increasing rotation number. Contrastingly, the elongated grains with a length of around 300 nm and a width of 30 nm, which are nearly constant with rotation number, are observed in the non-etched band. The mechanical hardness of TNTZHPT is consistently much higher than that of TNTZCR. The mechanical hardness distribution on the surface of TNTZHPT is heterogeneous in the radial and depth directions, while that of TNTZCR is homogeneous; the mechanical hardness is higher in the peripheral region than in the central region on the surfaces of TNTZHPT at all N. Further, the mechanical hardness distribution on the cross sections of TNTZHPT at all N is also heterogeneous in depth direction; the mechanical hardness is higher in the peripheral region than in the central region. The heterogeneous mechanical hardness distribution depending on the position on the surface and cross section of TNTZHPT is considered to be related to grain refinement and imposed strain due to HPT processing." @default.
• W2000641551 created "2016-06-24" @default.
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• W2000641551 date "2012-06-01" @default.
• W2000641551 modified "2023-09-29" @default.
• W2000641551 title "Heterogeneous structure and mechanical hardness of biomedical <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si16.gif display=inline overflow=scroll><mml:mi>β</mml:mi></mml:math>-type Ti–29Nb–13Ta–4.6Zr subjected to high-pressure torsion" @default.
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• W2000641551 doi "https://doi.org/10.1016/j.jmbbm.2012.02.022" @default.
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