TY - JOUR
T1 - Improvement of strength-ductility tradeoff in β titanium alloy through pre-strain induced twins combined with brittle ω phase
AU - Min, Xiaohua
AU - Emura, Satoshi
AU - Zhang, Ling
AU - Tsuzaki, Kaneaki
AU - Tsuchiya, Koichi
N1 - Funding Information:
This work was financially supported by National Natural Science Foundation of China (No. 51471040 ). The authors would like to thank the staff of Materials Manufacturing and Engineering Station at National Institute for Materials Science for preparing the materials, and Ms. Xin Ji for her help.
PY - 2015/10/14
Y1 - 2015/10/14
N2 - This paper provided a novel approach for improving the strength-ductility tradeoff in β titanium alloy through a combination of mechanical {332}<113> twins with brittle isothermal ω phase. Effects of pre-strain induced twins and subsequent precipitated ω phase on deformation microstructures, and tensile properties were investigated in a β-type Ti-15Mo alloy (mass%). Mechanical twins increased with increasing pre-strain from 1% to 9%, while formation of isothermal ω phase at 523-673. K for 3.6. ks was not significantly affected by the pre-strain induced twins. Yield strength and uniform elongation characteristics depended strongly on degree of pre-strain and aging temperature. An effective combination of 1-4% pre-strain and subsequent aging at 523-573. K markedly enhanced the uniform elongation in range of 8-15% at the yield strength level of 800-1000. MPa. The enhanced uniform elongation was mainly attributable to further twinning activation during deformation in conjunction with pre-strain induced twins.
AB - This paper provided a novel approach for improving the strength-ductility tradeoff in β titanium alloy through a combination of mechanical {332}<113> twins with brittle isothermal ω phase. Effects of pre-strain induced twins and subsequent precipitated ω phase on deformation microstructures, and tensile properties were investigated in a β-type Ti-15Mo alloy (mass%). Mechanical twins increased with increasing pre-strain from 1% to 9%, while formation of isothermal ω phase at 523-673. K for 3.6. ks was not significantly affected by the pre-strain induced twins. Yield strength and uniform elongation characteristics depended strongly on degree of pre-strain and aging temperature. An effective combination of 1-4% pre-strain and subsequent aging at 523-573. K markedly enhanced the uniform elongation in range of 8-15% at the yield strength level of 800-1000. MPa. The enhanced uniform elongation was mainly attributable to further twinning activation during deformation in conjunction with pre-strain induced twins.
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U2 - 10.1016/j.msea.2015.08.040
DO - 10.1016/j.msea.2015.08.040
M3 - Article
AN - SCOPUS:84940880550
VL - 646
SP - 279
EP - 287
JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
SN - 0921-5093
ER -