In situ correlation between metastable phase-transformation mechanism and kinetics in a metallic glass

AbstractA combination of complementary high-energy X-ray diffraction, containerless solidification during electromagnetic levitation and transmission electron microscopy is used to map in situ the phase evolution in a prototype Cu-Zr-Al glass during flash-annealing imposed at a rate ranging from 102 to 103 K s−1 and during cooling from the liquid state. Such a combination of experimental techniques provides hitherto inaccessible insight into the phase-transformation mechanism and its kinetics with high temporal resolution over the entire temperature range of the existence of the supercooled liquid. On flash-annealing, most of the formed phases represent transient (metastable) states – they crystallographically conform to their equilibrium phases but the compositions, revealed by atom probe tomography, are different. It is only the B2 CuZr phase which is represented by its equilibrium composition, and its growth is facilitated by a kinetic mechanism of Al partitioning; Al-rich precipitates of less than 10 nm in a diameter are revealed. In this work, the kinetic and chemical conditions of the high propensity of the glass for the B2 phase formation are formulated, and the multi-technique approach can be applied to map phase transformations in other metallic-glass-forming systems.

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Stress induced phase transformation in Ti60Cu14Ni12Sn4Ta10 nanostructure dendrite composite: In situ high-energy X-ray diffraction study

Materials Letters ◽

10.1016/j.matlet.2016.09.008 ◽

2016 ◽

Vol 185 ◽

pp. 376-379 ◽

Cited By ~ 1

Author(s):

T. Wang ◽

Q.G. Xie ◽

Y.D. Wu ◽

J.J. Si ◽

X.D. Hui ◽

...

Keyword(s):

Phase Transformation ◽

Diffraction Study ◽

High Energy ◽

X Ray Diffraction ◽

X Ray

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In Situ Stress Tensor Determination during Phase Transformation of a Metal Matrix Composite by High-Energy X-ray Diffraction

Materials ◽

10.3390/ma11081415 ◽

2018 ◽

Vol 11 (8) ◽

pp. 1415 ◽

Cited By ~ 4

Author(s):

Guillaume Geandier ◽

Lilian Vautrot ◽

Benoît Denand ◽

Sabine Denis

Keyword(s):

Phase Transformation ◽

Stress Tensor ◽

Metal Matrix Composite ◽

Matrix Composite ◽

Metal Matrix ◽

High Energy ◽

X Ray Diffraction ◽

Synchrotron Source ◽

X Ray

In situ high-energy X-ray diffraction using a synchrotron source performed on a steel metal matrix composite reinforced by TiC allows the evolutions of internal stresses during cooling to be followed thanks to the development of a new original experimental device (a transportable radiation furnace with controlled rotation of the specimen). Using the device on a high-energy beamline during in situ thermal treatment, we were able to extract the evolution of the stress tensor components in all phases: austenite, TiC, and even during the martensitic phase transformation of the matrix.

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Hydrothermal Synthesis and Phase Formation Mechanism of TiO2(B) Nanorods via Alkali Metal Titanate Phase Transformation

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.283.23 ◽

2018 ◽

Vol 283 ◽

pp. 23-36 ◽

Cited By ~ 2

Author(s):

Yothin Chimupala ◽

Rik Drummond-Brydson

Keyword(s):

Phase Transformation ◽

Intermediate Product ◽

Intermediate Phase ◽

Metastable Phase ◽

Exchange Process ◽

Titanium Isopropoxide ◽

Growth Direction ◽

Proton Exchange ◽

Transformation Mechanism ◽

Synthesis Conditions

Titanium dioxide (B phase) with 1-D structures was successfully fabricated via a hydrothermal method with a subsequent ion-exchange process and calcination. P25, titanium isopropoxide (TTIP), rutile and also anatase were used as Ti precursors in the alkali hydrothermal system. TTIP promoted an elongation of nanorod morphology whereas the other precursors produced short nanorod structures. The different types of titanium precursors did not have any influence on the phase transformation during the fabrication process. Na2Ti6O13 was the primary intermediate product after washing the hydrothermal sample. H2Ti3O7 was the secondary intermediate phase obtained following proton-exchange of Na2Ti6O13 in HNO3 solution. Finally, the TiO2(B) phase was the product of calcination of the secondary intermediate product at 400°C for 5 hr. A phase transformation mechanism is presented based on an investigation of products at each of the steps. The effects of the synthesis conditions on tailoring of the crystal morphology are discussed. The growth direction of the TiO2(B) nanorods was investigated by HR-TEM and SADP. Finally, the metastable phase of TiO2(B) was shown to be transformed to anatase during thermal treatment at temperatures higher than 400°C.

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Fabrication of Metastable Crystalline Nanocomposites by Flash Annealing of Cu47.5Zr47.5Al5 Metallic Glass Using Joule Heating

Nanomaterials ◽

10.3390/nano10010084 ◽

2020 ◽

Vol 10 (1) ◽

pp. 84 ◽

Cited By ~ 2

Author(s):

Ilya Okulov ◽

Ivan Soldatov ◽

Ivan Kaban ◽

Baran Sarac ◽

Florian Spieckermann ◽

...

Keyword(s):

Mechanical Properties ◽

Metallic Glass ◽

Heating Rate ◽

Joule Heating ◽

Annealing Time ◽

Volume Fraction ◽

Glassy Material ◽

Flash Annealing ◽

Temperature Equilibrium

Flash Joule-heating was applied to the Cu47.5Zr47.5Al5 metallic glass for designing fully crystalline metastable nanocomposites consisting of the metastable B2 CuZr and low-temperature equilibrium Cu10Zr7 phases. The onset of crystallization was in situ controlled by monitoring resistivity changes in the samples. The effect of heating rate and annealing time on the volume fraction of the crystalline phases and mechanical properties of the nanocomposites was studied in detail. Particularly, an increase of the heating rate and a decrease of the annealing time lead to a lower number of equilibrium Cu10Zr7 precipitates and an increase of tensile ductility. Tailoring of these non-equilibrium microstructures and mechanical properties may not be possible unless one starts with a fully glassy material that opens new perspectives for designing metastable nanomaterials with unique physical properties.

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In-Situ Investigation of Phase Transformation Kinetics in Ti-6Al-4V Under Rapid Heating Condition Using High-Energy Synchrotron Diffraction

Proceedings of the 13th World Conference on Titanium ◽

10.1002/9781119296126.ch97 ◽

2016 ◽

pp. 591-598 ◽

Cited By ~ 1

Author(s):

A. Idhil Ismail ◽

M Dehmas ◽

E. Aeby-Gautier ◽

B. Appolaire

Keyword(s):

Phase Transformation ◽

Rapid Heating ◽

High Energy ◽

Heating Condition ◽

Transformation Kinetics ◽

Synchrotron Diffraction ◽

Phase Transformation Kinetics ◽

In Situ Investigation ◽

High Energy Synchrotron Diffraction

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In situ high-energy X-ray diffraction study of thermally-activated martensitic transformation far below room temperature in CuZr-based bulk metallic glass composites

Journal of Alloys and Compounds ◽

10.1016/j.jallcom.2020.155781 ◽

2020 ◽

Vol 841 ◽

pp. 155781 ◽

Cited By ~ 3

Author(s):

Kaikai Song ◽

Shuang Wu ◽

Ivan Kaban ◽

Mihai Stoica ◽

Jozef Bednarčík ◽

...

Keyword(s):

Martensitic Transformation ◽

Metallic Glass ◽

Room Temperature ◽

High Energy ◽

X Ray Diffraction ◽

X Ray ◽

Glass Composites ◽

Thermally Activated ◽

Bulk Metallic Glass Composites

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In Situ High Energy X-Ray Diffraction for Investigating the Phase Transformation in Hot Rolled TRIP-Aided Steels

Advanced Engineering Materials ◽

10.1002/adem.201300537 ◽

2014 ◽

Vol 16 (8) ◽

pp. 1044-1051 ◽

Cited By ~ 7

Author(s):

Piyada Suwanpinij ◽

Andreas Stark ◽

Xiaoxiao Li ◽

Frank Römer ◽

Klaus Herrmann ◽

...

Keyword(s):

Phase Transformation ◽

High Energy ◽

X Ray Diffraction ◽

X Ray ◽

Hot Rolled

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High-Energy Synchrotron X-Ray Diffraction for In Situ Study of Phase Transformation in Shape-Memory Alloys

JOM ◽

10.1007/s11837-011-0221-0 ◽

2012 ◽

Vol 64 (1) ◽

pp. 150-160 ◽

Cited By ~ 3

Author(s):

Y. D. Wang ◽

Z. H. Nie ◽

Y. Ren ◽

P. K. Liaw

Keyword(s):

Phase Transformation ◽

Shape Memory Alloys ◽

Shape Memory ◽

High Energy ◽

X Ray Diffraction ◽

X Ray ◽

In Situ Study

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In situ high-energy x-ray diffraction observation of structural evolution in a Ti-based bulk metallic glass upon heating

Journal of Materials Research ◽

10.1557/jmr.2010.0298 ◽

2010 ◽

Vol 25 (12) ◽

pp. 2271-2277 ◽

Cited By ~ 11

Author(s):

N. Zheng ◽

G. Wang ◽

L.C. Zhang ◽

M. Calin ◽

M. Stoica ◽

...

Keyword(s):

Metallic Glass ◽

Bulk Metallic Glass ◽

Free Volume ◽

Structural Relaxation ◽

Structural Evolution ◽

High Energy ◽

Rapid Quenching ◽

X Ray Diffraction ◽

X Ray

The structural evolution of the Ti40Zr10Cu34Pd14Sn2 bulk metallic glass (BMG) upon was investigated by means of in situ high-energy x-ray diffraction. The position, width, and intensity of the first peak in diffraction patterns are fitted through Voigt function below 800 K. All the peak position, width, and intensity values show a nearly linear increase with the increasing temperature to the onset temperature of structural relaxation, Tr = 510 K. However, these values start to deviate from the linear behavior between Tr and Tg (the glass transition temperature). The changes in free volume and the coefficient of volume thermal expansion prove that the aforementioned phenomenon is closely related to the structural relaxation releasing excess free volume arrested during rapid quenching of the BMG. Above 800 K, three crystallization events are detected and the first exothermic event is due to the formation of metastable nanocrystals.

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