TY - JOUR
T1 - Effect of swaging on Young[U+05F3]s modulus of β Ti-33.6Nb-4Sn alloy
AU - Hanada, Shuji
AU - Masahashi, Naoya
AU - Jung, Taek Kyun
AU - Miyake, Masahiro
AU - Sato, Yutaka S.
AU - Kokawa, Hiroyuki
N1 - Funding Information:
This work was supported by the Japan Science and Technology Agency in collaboration with Mizuho Ikakogyo Co., Ltd. , Seiko Instruments Inc. , TDF Corporation and Tohoku University School of Medicine .
PY - 2014/4
Y1 - 2014/4
N2 - The effect of swaging on the Young's modulus of β Ti-33.6Nb-4Sn rods was investigated by X-ray diffraction, thermography, microstructural observations, deformation simulator analysis and cyclic tensile deformation. Stress-induced α″ martensite was stabilized by swaging, dependent on the diameter reduction rate during swaging. Thermography and deformation simulator analysis revealed that swaged rods were adiabatically heated, and consequently, stress-induced α″ underwent reverse transformation. Young's modulus, which was measured by the slope of the initial portion of the stress-strain curve, decreased from 56. GPa in the hot-forged/quenched rod to 44. GPa in the rapidly swaged rod with a high reduction rate and to 45. GPa in the gradually swaged rod with a low reduction rate. The tangent modulus, which was measured by the slope of the tangent to any point on the stress-strain curve, decreased with strain even in the linear range of the stress-strain curve of the hot-forged/quenched rod and the rapidly swaged rod, while the tangent modulus remained unchanged for the gradually swaged rod. It was found that Young's moduli in swaged β Ti-33.6Nb-4Sn rods were affected by stabilized α″ martensite. Low Young's modulus of 45. GPa and high strength over 800. MPa were obtained when the reverse transformation by adiabatic heating was suppressed and the stress-induced α″ was sufficiently stabilized by gradual swaging to a 75% reduction in cross section area.
AB - The effect of swaging on the Young's modulus of β Ti-33.6Nb-4Sn rods was investigated by X-ray diffraction, thermography, microstructural observations, deformation simulator analysis and cyclic tensile deformation. Stress-induced α″ martensite was stabilized by swaging, dependent on the diameter reduction rate during swaging. Thermography and deformation simulator analysis revealed that swaged rods were adiabatically heated, and consequently, stress-induced α″ underwent reverse transformation. Young's modulus, which was measured by the slope of the initial portion of the stress-strain curve, decreased from 56. GPa in the hot-forged/quenched rod to 44. GPa in the rapidly swaged rod with a high reduction rate and to 45. GPa in the gradually swaged rod with a low reduction rate. The tangent modulus, which was measured by the slope of the tangent to any point on the stress-strain curve, decreased with strain even in the linear range of the stress-strain curve of the hot-forged/quenched rod and the rapidly swaged rod, while the tangent modulus remained unchanged for the gradually swaged rod. It was found that Young's moduli in swaged β Ti-33.6Nb-4Sn rods were affected by stabilized α″ martensite. Low Young's modulus of 45. GPa and high strength over 800. MPa were obtained when the reverse transformation by adiabatic heating was suppressed and the stress-induced α″ was sufficiently stabilized by gradual swaging to a 75% reduction in cross section area.
KW - Adiabatic heating
KW - Beta titanium alloy
KW - Strength
KW - Stress-induced martensite
KW - Swaging
KW - Young's modulus
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U2 - 10.1016/j.jmbbm.2013.10.027
DO - 10.1016/j.jmbbm.2013.10.027
M3 - Article
C2 - 24378733
AN - SCOPUS:84894041572
SN - 1751-6161
VL - 32
SP - 310
EP - 320
JO - Journal of the Mechanical Behavior of Biomedical Materials
JF - Journal of the Mechanical Behavior of Biomedical Materials
ER -