TY - JOUR
T1 - Enhanced work hardening by redistribution of oxygen in (α+β)-type Ti-4Cr-0.2O alloys
AU - Kang, Duck Soo
AU - Koga, Norimitsu
AU - Sakata, Masayuki
AU - Nakada, Nobuo
AU - Tsuchiyama, Toshihiro
AU - Takaki, Setsuo
N1 - Funding Information:
This study was supported by Grant-in-Aid for Scientific Research (C) No. 23560840 (2011–2013) from the Japan Society for the Promotion of Science and the International Institute for Carbon Neutral Energy Research ( WPI-I2CNER ), sponsored by the Japanese Ministry of Education, Culture, Sports, Science and Technology .
PY - 2014/6/12
Y1 - 2014/6/12
N2 - Tensile deformation behavior of an (α+β) dual-phase Ti-4%Cr alloy containing 0.2% oxygen was compared to that of a low-oxygen Ti-4%Cr alloy. The effect of oxygen content on work hardening behavior is discussed herein in terms of inhomogeneous deformation, which relates to the strength ratio of the α and β phases. In the low-oxygen Ti-4%Cr alloy, plastic deformation preferentially occurred in the α phase because the hardness of the β phase is significantly higher. On the other hand, in the Ti-4%Cr-0.2%O alloy, not only the α phase but also the β phase deformed plastically during tensile deformation owing to their similar hardness, where oxygen concentrated into the α phase and increased the hardness by solid solution strengthening. As a result of plastic deformation of the β phase, {332}<113>β deformation twins were formed within the β grains and caused a significant work hardening due to twinning-induced plasticity (TWIP). This leads to good ductility of the Ti-4%Cr-0.2%O alloy in spite of its higher strength compared to the Ti-4%Cr alloy.
AB - Tensile deformation behavior of an (α+β) dual-phase Ti-4%Cr alloy containing 0.2% oxygen was compared to that of a low-oxygen Ti-4%Cr alloy. The effect of oxygen content on work hardening behavior is discussed herein in terms of inhomogeneous deformation, which relates to the strength ratio of the α and β phases. In the low-oxygen Ti-4%Cr alloy, plastic deformation preferentially occurred in the α phase because the hardness of the β phase is significantly higher. On the other hand, in the Ti-4%Cr-0.2%O alloy, not only the α phase but also the β phase deformed plastically during tensile deformation owing to their similar hardness, where oxygen concentrated into the α phase and increased the hardness by solid solution strengthening. As a result of plastic deformation of the β phase, {332}<113>β deformation twins were formed within the β grains and caused a significant work hardening due to twinning-induced plasticity (TWIP). This leads to good ductility of the Ti-4%Cr-0.2%O alloy in spite of its higher strength compared to the Ti-4%Cr alloy.
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U2 - 10.1016/j.msea.2014.03.076
DO - 10.1016/j.msea.2014.03.076
M3 - Article
AN - SCOPUS:84898648495
SN - 0921-5093
VL - 606
SP - 101
EP - 107
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
ER -