Role of displacement cascades in Ni clustering in a ferritic Fe-3.3 at%Ni model alloy: Comparison of heavy and light particle irradiations

This paper discusses the role of grain size distribution on the recrystallisation rates and Avrami values for a Fe-30 wt. % Ni steel, which was used as a model alloy retaining an austenitic structure to room temperature. Cold deformation was used to provide uniform macroscopic strain distributions (strains of 0.2 and 0.3), followed by recrystallisation during annealing at 850–950 °C. It was shown that the Avrami parameter was directly related to the grain size distribution, with a lower Avrami exponent being seen for a larger average and wider grain size distribution. A method to predict the Avrami exponent from the grain size distribution was proposed. In situ heating in an SEM with EBSD showed the recrystallisation kinetics to be affected by differences in stored energy and nucleation in the different grain sizes supporting the proposed relationship.

Download Full-text

The role of melting temperature and electron-phonon coupling in the formation of clustered vacancy defects from heavy ion generated displacement cascades in Cu-Ni alloys

Scripta Metallurgica et Materialia ◽

10.1016/0956-716x(93)90370-8 ◽

1993 ◽

Vol 28 (7) ◽

pp. 879-884 ◽

Cited By ~ 7

Author(s):

D.K Tappin ◽

I.M Robertson ◽

M.A Kirk ◽

K Smalinskas

Keyword(s):

Melting Temperature ◽

Heavy Ion ◽

Phonon Coupling ◽

Vacancy Defects ◽

Displacement Cascades ◽

Ni Alloys ◽

Electron Phonon Coupling

Download Full-text

Multi-scale and spatially resolved hydrogen mapping in a Ni–Nb model alloy reveals the role of the δ phase in hydrogen embrittlement of alloy 718

Acta Materialia ◽

10.1016/j.actamat.2016.02.053 ◽

2016 ◽

Vol 109 ◽

pp. 69-81 ◽

Cited By ~ 57

Author(s):

Z. Tarzimoghadam ◽

M. Rohwerder ◽

S.V. Merzlikin ◽

A. Bashir ◽

L. Yedra ◽

...

Keyword(s):

Hydrogen Embrittlement ◽

Model Alloy ◽

Alloy 718 ◽

Multi Scale ◽

Spatially Resolved ◽

Δ Phase

Download Full-text

Role of thermal spikes in energetic displacement cascades

Physical Review Letters ◽

10.1103/physrevlett.59.1930 ◽

1987 ◽

Vol 59 (17) ◽

pp. 1930-1933 ◽

Cited By ~ 350

Author(s):

T. Diaz de la Rubia ◽

R. S. Averback ◽

R. Benedek ◽

W. E. King

Keyword(s):

Displacement Cascades

Download Full-text

Refinement of Microstructure in Steels through Thermomechanical Processing

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.97-101.2163 ◽

2010 ◽

Vol 97-101 ◽

pp. 2163-2166 ◽

Cited By ~ 1

Author(s):

Hossein Beladi ◽

Ilana B. Timokhina ◽

Subatra Mukherjee ◽

Peter D. Hodgson

Keyword(s):

Phase Transformation ◽

Grain Refinement ◽

Thermomechanical Processing ◽

Model Alloy ◽

Processing Route ◽

Steel Composition ◽

Composition Design ◽

Static Phase ◽

Strength And Toughness

The refinement of microstructure is the most generally accepted approach to simultaneously improve the strength and toughness in steels. In the current study, the role of dynamic/static phase transformation on the ferrite grain refinement was investigated using different thermomechanical processing routes. A Ni-30Fe austenitic model alloy was also used to investigate the substructure character formed during deformation. It was revealed that the microstructure of steel could further be refined to the nanoscale through both the control of processing route and steel composition design.

Download Full-text

The role of melting temperature and electron-phonon coupling in the formation of clustered vacancy defects from heavy-ion-generated displacement cascades

Philosophical Magazine A ◽

10.1080/01418619308219370 ◽

1993 ◽

Vol 68 (5) ◽

pp. 843-864 ◽

Cited By ~ 22

Author(s):

I. M. Robertson ◽

D. K. Tappin ◽

M. A. Kirk

Keyword(s):

Melting Temperature ◽

Heavy Ion ◽

Phonon Coupling ◽

Vacancy Defects ◽

Displacement Cascades ◽

Electron Phonon Coupling

Download Full-text

Molecular Dynamics simulations of displacement cascades: role of the interatomic potentials and of the potential hardening

MRS Proceedings ◽

10.1557/proc-650-r3.24 ◽

2000 ◽

Vol 650 ◽

Author(s):

C.S. Becquart ◽

C. Domain ◽

A. Legris ◽

J.C. van Duysen

Keyword(s):

Molecular Dynamics ◽

Thermal Characteristics ◽

Md Simulations ◽

Interatomic Potentials ◽

Static Properties ◽

Displacement Cascades ◽

Energy Transfers ◽

Primary Damage ◽

Dynamics Simulations

ABSTRACTThe role of the interatomic potentials on the primary damage has been investigated by Molecular Dynamics (MD) simulations of displacement cascades with three different interatomic potentials dedicated to α-Fe. The primary damage, caused by the neutron interaction with the matter, has been found to be potential sensitive. We have investigated the equilibrium parts of the potential as well as the “short distance interactions” which appear to have a strong influence on the cascade morphology and defects distribution at the end of the cascade. The static properties as well as dynamical (thermal) characteristics of the potentials have been considered; the kinetic and potential energy transfers during the collisions have also been studied.

Download Full-text