Role of Structural Impurities in Phase Transformations in Solids

AbstractSingle crystals and bicrystals of water ice have been adiabatically pressurized to produce, and clearly illustrate, two types of internal melt figures: (1) dendritic figures that grow from nucleation imperfections on the specimen’s surface, or from air bubbles at grain boundaries, into the ice as pressure is elevated; and (2) compression melt fractures, flat liquid-filled disks, that nucleate at imperfections in the crystal and grow with the application of pressure eventually to sprout dendritic fingers at the periphery. The transparency of the ice permitted visualization of the growth and behavior of the figures, and this could be an important tool in understanding the role of phase transformations in deep-focus earthquakes. Correlation between figure size and pressure is noted for the first time.

Download Full-text

Analysis of the Role of Phase Transformations in the Reproduction of Gas–Liquid Flows is a Possibility to Improve the Standards of Discharge for Multiphase Flows

Measurement Techniques ◽

10.1007/s11018-018-1328-2 ◽

2018 ◽

Vol 60 (11) ◽

pp. 1122-1129

Author(s):

M. I. Tonkonog ◽

K. A. Levin ◽

A. S. Shabalin ◽

V. A. Makarov ◽

I. I. Fishman

Keyword(s):

Phase Transformations ◽

Multiphase Flows ◽

Liquid Flows

Download Full-text

Bainite Reaction and Role of Shear in Diffusional Phase Transformations

Mechanisms of Diffusional Phase Transformations in Metals and Alloys ◽

10.1201/b15829-12 ◽

2016 ◽

pp. 653-674

Keyword(s):

Phase Transformations

Download Full-text

Elemental Interfaces and Displacive Phase Transformations

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.59.63 ◽

2008 ◽

Vol 59 ◽

pp. 63-68

Author(s):

Václav Paidar

Keyword(s):

Phase Transformations ◽

Structural Changes ◽

Atomic Plane ◽

Many Body ◽

Single Plane ◽

Atomistic Models ◽

Shear Type ◽

Hcp Structure ◽

The Many

Two basic processes, namely shear and shuffling of atomic planes can be considered as elementary mechanisms of displacive phase transformations. The atomistic models suitable to investigate the role of interfaces in the structural changes are tested. The many-body potentials are used for the description of interatomic forces. General displacements of atomic planes are examined, i.e. γ-surface type calculations extensively used for stacking fault and lattice dislocation analysis are applied to single plane shuffling and alternate shuffling of every other atomic plane producing in combination with homogeneous deformation the hcp structure. Similar approach considering shear type planar displacements leads to the Zener path between the bcc and fcc lattices. The effect of additional deformation required to obtain the close-packed atomic arrangements is analysed.

Download Full-text

On the Role of Elastic Energy in Diffusional Phase Transformations

Advances in Phase Transitions ◽

10.1016/b978-0-08-036234-2.50021-0 ◽

1988 ◽

pp. 204-220

Author(s):

GARY R. PURDY ◽

JOHN R. DRYDEN

Keyword(s):

Phase Transformations ◽

Elastic Energy

Download Full-text

Role of adsorbate interactions in surface dynamics and phase transformations: Mean‐field and quasichemical approximation approaches

The Journal of Chemical Physics ◽

10.1063/1.466601 ◽

1994 ◽

Vol 100 (2) ◽

pp. 1742-1755 ◽

Cited By ~ 5

Author(s):

Asha Datar ◽

S. D. Prasad

Keyword(s):

Phase Transformations ◽

Mean Field ◽

Surface Dynamics ◽

Quasichemical Approximation

Download Full-text

The Role of Stresses on Phase Transformations

Advances in Phase Transitions ◽

10.1016/b978-0-08-036234-2.50020-9 ◽

1988 ◽

pp. 193-203

Author(s):

FRANCIS C. LARCHE

Keyword(s):

Phase Transformations

Download Full-text

The nature and role of incoherent interphase interfaces in diffusional solid-solid phase transformations

Metallurgical and Materials Transactions A ◽

10.1007/bf02719726 ◽

2006 ◽

Vol 37 (13) ◽

pp. 825-831

Author(s):

T. B. Massalski ◽

W. A. Soffa ◽

D. E. Laughlin

Keyword(s):

Phase Transformations ◽

Solid Phase

Download Full-text

Displacive Phase Transformations

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.150.159 ◽

2009 ◽

Vol 150 ◽

pp. 159-174 ◽

Cited By ~ 2

Author(s):

Václav Paidar ◽

Andriy Ostapovets

Keyword(s):

Phase Transformations ◽

Atomic Plane ◽

Many Body ◽

Surface Type ◽

Single Plane ◽

Bcc Structure ◽

Shear Type ◽

Structural Configurations ◽

Hcp Structure

Shear deformation and shuffling of atomic planes are elementary mechanisms of collective atomic motion that take place during displacive phase transformations. General displacements of atomic planes are examined, i.e. -surface type calculations extensively used for the stacking faults and crystal dislocations are applied to single plane shuffling and alternate shuffling of every other atomic plane producing in combination with homogeneous deformation the hcp structure (martensitic type) from the initial bcc structure (austenitic type). Similar approach considering shear type planar displacements leads to the Zener path between the bcc and fcc lattices. The effect of additional deformation required to obtain the close-packed atomic arrangements is examined as well. Finally, the influence of volume modification on phase transitions is investigated. The energies of various structural configurations are calculated using many-body potentials for the description of interatomic forces. Such atomic models are tested to check their suitability for investigation of the role of interfaces in the displacive structural transitions.

Download Full-text