Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Diffusive and displacive phase transitions in Ti–Fe and Ti–Co alloys under high pressure torsion. / Straumal, B. B.; Kilmametov, A. R.; Ivanisenko, Yu; Mazilkin, A. A.; Valiev, R. Z.; Afonikova, N. S.; Gornakova, A. S.; Hahn, H.
в: Journal of Alloys and Compounds, Том 735, 25.02.2018, стр. 2281-2286.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Diffusive and displacive phase transitions in Ti–Fe and Ti–Co alloys under high pressure torsion
AU - Straumal, B. B.
AU - Kilmametov, A. R.
AU - Ivanisenko, Yu
AU - Mazilkin, A. A.
AU - Valiev, R. Z.
AU - Afonikova, N. S.
AU - Gornakova, A. S.
AU - Hahn, H.
PY - 2018/2/25
Y1 - 2018/2/25
N2 - The high pressure torsion (HPT) of Ti–4 wt. % Fe and Ti–4 wt. % Co alloys has been studied. Before HPT, the samples were annealed above and below the temperature of eutectoid transformation. After quenching, the first samples contained a mixture of α and β phases. The latter samples contained a mixture of α-Ti saturated with Fe or Co and respective intermetallic phases TiFe. During HPT the high-pressure ω-phase formed in all samples. The amount of ω-phase was higher when the initial samples contained the α+β mixture then in the case of α+TiFe or α+Ti2Co mixture. Most probably, the martensitic β→ω transformation occurs easier than the α→ω one. The amount of ω-phase was higher in Ti–Fe alloy than in the Ti–Co alloy for both initial states. It seems that cobalt additions disadvantageously change the lattice parameters in Ti for martensitic β→ω and α→ω transformations. The phase transformations with mass transfer (diffusive ones) also take place by HPT of Ti–Fe and Ti–Co alloys. Both α-based solid solutions partially decomposed after HPT. After HPT, the lattice parameters of α-phase containing cobalt or iron changed towards those of pure α-Ti. It has been observed for the first time that the composition of TiFe phase also changes after HPT.
AB - The high pressure torsion (HPT) of Ti–4 wt. % Fe and Ti–4 wt. % Co alloys has been studied. Before HPT, the samples were annealed above and below the temperature of eutectoid transformation. After quenching, the first samples contained a mixture of α and β phases. The latter samples contained a mixture of α-Ti saturated with Fe or Co and respective intermetallic phases TiFe. During HPT the high-pressure ω-phase formed in all samples. The amount of ω-phase was higher when the initial samples contained the α+β mixture then in the case of α+TiFe or α+Ti2Co mixture. Most probably, the martensitic β→ω transformation occurs easier than the α→ω one. The amount of ω-phase was higher in Ti–Fe alloy than in the Ti–Co alloy for both initial states. It seems that cobalt additions disadvantageously change the lattice parameters in Ti for martensitic β→ω and α→ω transformations. The phase transformations with mass transfer (diffusive ones) also take place by HPT of Ti–Fe and Ti–Co alloys. Both α-based solid solutions partially decomposed after HPT. After HPT, the lattice parameters of α-phase containing cobalt or iron changed towards those of pure α-Ti. It has been observed for the first time that the composition of TiFe phase also changes after HPT.
KW - Decomposition of solid solution
KW - High-pressure torsion
KW - Phase transitions
KW - Ti–Co alloys
KW - Ti–Fe alloys
KW - NANOCRYSTALLINE STRUCTURE
KW - B ALLOY
KW - NANOSTRUCTURE
KW - Ti-Fe alloys
KW - PRECIPITATION
KW - SEVERE PLASTIC-DEFORMATION
KW - ZN
KW - Ti-Co alloys
KW - AL-MG ALLOYS
KW - AG ALLOYS
KW - MAGNETIC-PROPERTIES
KW - TRANSFORMATIONS
UR - http://www.scopus.com/inward/record.url?scp=85036639198&partnerID=8YFLogxK
U2 - 10.1016/j.jallcom.2017.11.317
DO - 10.1016/j.jallcom.2017.11.317
M3 - Article
AN - SCOPUS:85036639198
VL - 735
SP - 2281
EP - 2286
JO - Journal of Alloys and Compounds
JF - Journal of Alloys and Compounds
SN - 0925-8388
ER -
ID: 35161738