Effect of High-Pressure Torsion and Annealing on the Structure, Phase Composition, and Microhardness of the Ti-18Zr-15Nb (at. %) Alloy

被引：6
|
作者：
Gunderov, Dmitry [1 ,2 ]
Kim, Karina [1 ,2 ]
Gunderova, Sofia [1 ,2 ]
Churakova, Anna [1 ,2 ]
Lebedev, Yuri [2 ]
Nafikov, Ruslan [1 ]
Derkach, Mikhail [3 ]
Lukashevich, Konstantin [3 ]
Sheremetyev, Vadim [3 ]
Prokoshkin, Sergey [3 ]
机构：
[1] Ufa Univ Sci & Technol, Dept Mat Sci & Phys Met, Zaki Validi St 32, Ufa 450076, Russia
[2] UFRC RAS, Inst Mol & Crystal Phys, Lab Solid State Phys, 151 Prospect Oktyabrya, Ufa 450075, Russia
[3] Natl Univ Sci & Technol MISiS, Met Forming Dept, Leninsky Ave 4,P 1, Moscow 119049, Russia
来源：
MATERIALS | 2023年 / 16卷 / 04期
基金：
俄罗斯科学基金会;
关键词：
Ti-18Zr-15Nb shape memory alloys; high-pressure torsion; phase transformations during heating; TRANSFORMATION; TITANIUM; EVOLUTION; SIZE;
D O I：
10.3390/ma16041754
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The Ti-18Zr-15Nb shape memory alloys are a new material for medical implants. The regularities of phase transformations during heating of this alloy in the coarse-grained quenched state and the nanostructured state after high-pressure torsion have been studied. The specimens in quenched state (Q) and HPT state were annealed at 300-550 degrees C for 0.5, 3, and 12 h. The alpha-phase formation in Ti-18Zr-15Nb alloy occurs by C-shaped kinetics with a pronounced peak near 400-450 degrees C for Q state and near 350-450 degrees C for HPT state, and stops or slows down at higher and lower annealing temperatures. The formation of a nanostructured state in the Ti-18Zr-15Nb alloy as a result of HPT suppresses the beta ->omega phase transformation during low-temperature annealing (300-350 degrees C), but activates the beta ->alpha phase transformation. In the Q-state the alpha-phase during annealing at 450-500 degrees C is formed in the form of plates with a length of tens of microns. The alpha-phase formed during annealing of nanostructured specimens has the appearance of nanosized particle-grains of predominantly equiaxed shape, distributed between the nanograins of beta-phase. The changes in microhardness during annealing of Q-specimens correlate with changes in phase composition during aging.
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页数：17
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