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

被引：8

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.

引用

页数：17

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