Transformation Pathway upon Heating of Ti-Fe Alloys Deformed by High-Pressure Torsion

被引：30

作者：

Kriegel, Mario J. ^{[1
]}

Kilmametov, Askar ^{[2
]}

Rudolph, Martin ^{[1
]}

Straumal, Boris B. ^{[2
,3
,4
]}

Gornakova, Alena S. ^{[3
]}

Stoecker, Hartmut ^{[5
]}

Ivanisenko, Yulia ^{[2
]}

Fabrichnaya, Olga ^{[1
]}

Hahn, Horst ^{[2
]}

Rafaja, David ^{[1
]}

机构：

[1] TU Bergakad Freiberg, Inst Mat Sci, D-09599 Freiberg, Germany

[2] Karlsruhe Inst Technol, Inst Nanotechnol, D-76344 Eggenstein Leopoldshafen, Germany

[3] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia

[4] Natl Univ Sci & Technol MISIS, Lab Hybrid Nanomat, Moscow 119049, Russia

[5] TU Bergakad Freiberg, Inst Expt Phys, D-09599 Freiberg, Germany

来源：

ADVANCED ENGINEERING MATERIALS | 2018年 / 20卷 / 04期

基金：

俄罗斯基础研究基金会;

关键词：

Fe-Ti; high-pressure torsion; in situ high-temperature XRD; kinetics; omega-Ti; thermodynamics; transformation pathway; PHASE-TRANSFORMATIONS; MICROSTRUCTURAL EVOLUTION; TITANIUM-ALLOYS; OMEGA-PHASE; ALPHA; BETA; DEFORMATION; TRANSITION; METALS;

D O I：

10.1002/adem.201700933

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The current work presents the results of a study of the thermal stability of metastable omega-Ti(Fe) produced by a high-pressure torsion process and describes the phase transformations of omega-Ti(Fe) upon heating. The titanium alloys under study contain between 1 and 7wt% of iron, the phase transitions are investigated using a combination of in situ high-temperature X-ray diffraction and differential scanning calorimetry. The high-temperature X-ray diffraction reveals the phase sequence omega -> alpha' -> alpha + beta -> beta upon heating. The differential scanning calorimetry shows that the first phase transformation is exothermal and that the temperature of this phase transition is independent of the iron concentration within the composition range under study. Subsequent phase transitions are endothermal and the respective transition temperatures depend on the iron concentration. The differences between the phase stabilities conclude from the phase diagram and the phase stabilities observe experimentally are explained by the partial coherence of the alpha/alpha'-Ti and beta-Ti grains.

引用

页数：7

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