Research output: Contribution to journal › Article › peer-review
High pressure torsion induced strustural transformation in Ti- and Zr-based amorphous alloys. / Gunderov, Dmitry ; Boltynjuk, Evgeniy ; Ubyivovk, Evgeny ; Churakova, Anna ; Abrosimova, G.E.; Ситдиков, Виль Даянович; Kilmametov, A. R.; Valiev, Ruslan Z. .
In: IOP Conference Series: Materials Science and Engineering, No. 447, 012052, 2018.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - High pressure torsion induced strustural transformation in Ti- and Zr-based amorphous alloys
AU - Gunderov, Dmitry
AU - Boltynjuk, Evgeniy
AU - Ubyivovk, Evgeny
AU - Churakova, Anna
AU - Abrosimova, G.E.
AU - Ситдиков, Виль Даянович
AU - Kilmametov, A. R.
AU - Valiev, Ruslan Z.
PY - 2018
Y1 - 2018
N2 - The melt-spun (MS) Ti50Ni25Cu25 alloy and the Zr62Cu22Al10Fe5Dy1 bulk metallic glass (BMG) were subjected to high pressure torsion (HPT). X-ray diffraction (XRD) measurements show a shift of the first diffraction halo to a low angle after HPT processing, which corresponds to an increase in the values of the radius of the first coordination sphere and the free volume. Direct density measurements confirmed an increase in free volume values. A special TEM procedure was used for a detailed study of the microstructure of both amorphous alloys after HPT processing. The study revealed the formation of a large density of shear bands (SBs) in both alloys. Nanocrystals are formed directly in shear bands as a result of strain-induced nanocrystallization. Amorphous nanoclusters with a size of 20 nm are formed in an amorphous matrix surrounding the SBs in the HPT-processed MS alloy Ti50Ni25Cu25. The formation of nanoclusters was not observed in BMG Zr62Cu22Al10Fe5Dy1 after HPT processing.
AB - The melt-spun (MS) Ti50Ni25Cu25 alloy and the Zr62Cu22Al10Fe5Dy1 bulk metallic glass (BMG) were subjected to high pressure torsion (HPT). X-ray diffraction (XRD) measurements show a shift of the first diffraction halo to a low angle after HPT processing, which corresponds to an increase in the values of the radius of the first coordination sphere and the free volume. Direct density measurements confirmed an increase in free volume values. A special TEM procedure was used for a detailed study of the microstructure of both amorphous alloys after HPT processing. The study revealed the formation of a large density of shear bands (SBs) in both alloys. Nanocrystals are formed directly in shear bands as a result of strain-induced nanocrystallization. Amorphous nanoclusters with a size of 20 nm are formed in an amorphous matrix surrounding the SBs in the HPT-processed MS alloy Ti50Ni25Cu25. The formation of nanoclusters was not observed in BMG Zr62Cu22Al10Fe5Dy1 after HPT processing.
UR - https://iopscience.iop.org/article/10.1088/1757-899X/447/1/012052
UR - https://www.researchgate.net/publication/329107989_High_pressure_torsion_induced_structural_transformations_in_Ti-_and_Zr-based_amorphous_alloys
M3 - Article
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
SN - 1757-8981
IS - 447
M1 - 012052
T2 - Open School-Conference of NIS Countries on Ultrafine Grained and Nanostructured Materials 2018, UFGNM 2018
Y2 - 1 October 2018 through 5 October 2018
ER -
ID: 36059904