A dispersion strengthening model based on differing elastic moduli applied to the iron-copper system

Russell, Kathryn C; Brown, L. M.

doi:10.1016/0001-6160(72)90091-0

Cited by 421 publications

(186 citation statements)

References 3 publications

Supporting

Mentioning

166

Contrasting

Unclassified

Order By: Relevance

“…[50] The source of this controversy is possibly a result of a combination of a number of precipitation strengthening mechanisms include lattice mismatch, modulus mismatch, and chemical hardening. [51][52][53][54][55][56][57] Also, when the dislocation enters the precipitate two partial dislocations are created that combine when the dislocation leaves the precipitate. Energy must be supplied to move the dislocation out of the precipitate.…”

Section: Atom-probe Tomographymentioning

confidence: 99%

High-Strength Low-Carbon Ferritic Steel Containing Cu-Fe-Ni-Al-Mn Precipitates

Vaynman

Isheim

Kolli³

et al. 2008

Metall Mater Trans A

109

View full text Add to dashboard Cite

An investigation of a low-carbon, Fe-Cu-based steel, for Naval ship hull applications, with a yield strength of 965 MPa, Charpy V-notch absorbed impact-energy values as high as 74 J at -40°C, and an elongation-to-failure greater than 15 pct, is presented. The increase in strength is derived from a large number density (approximately 10 23 to 10 24 m -3 ) of copper-iron-nickelaluminum-manganese precipitates. The effect on the mechanical properties of varying the thermal treatment was studied. The nanostructure of the precipitates found within the steel was characterized by atom-probe tomography. Additionally, initial welding studies show that a brittle heat-affected zone is not formed adjacent to the welds.

show abstract

Section: Atom-probe Tomographymentioning

confidence: 99%

High-Strength Low-Carbon Ferritic Steel Containing Cu-Fe-Ni-Al-Mn Precipitates

Vaynman

Isheim

Kolli³

et al. 2008

Metall Mater Trans A

109

View full text Add to dashboard Cite

show abstract

“…Based on the result of the calculation, the yield stress changes of the model alloy were calculated by using the Orowan model 14) and the Russel-Brown model, 15) and the damage rate dependences of the yield stress change were ex- amined. The Orowan model was applied to interstitial clusters and to vacancy clusters, and the Russel-Brown model was applied to copper clusters.…”

Section: Description Of the Modelmentioning

confidence: 99%

Model Calculation of the Damage Rate Dependence of Yield Stress Change in an Irradiated Fe-Cu Model Alloy

Yanagita

Yoshiie

et al. 2002

Mater. Trans.

View full text Add to dashboard Cite

The damage rate dependence of the yield stress change in a neutron-irradiated Fe-Cu model alloy was analyzed by a model calculation. The model was based on the rate theory, and focused on the description of the nucleation and growth of point defect clusters and copper clusters. The binding between copper atoms and vacancies and the effect of cascade damage which directly creates small point defect clusters were incorporated in this model. The instability of small point defect clusters caused by thermal dissociation was also included. From the result of the calculation, the yield stress changes were estimated using the Orowan model and the Russel-Brown model. As a result of this calculation, it was clarified that copper clusters are the main factor of yield stress change in almost all irradiation stages below 0.1 dpa. The contribution of copper clusters to yield stress change increased with decreasing damage rate. The nature of the damage rate dependence is not affected by the copper-vacancy binding but by the sink strength, which changes dynamically throughout irradiation.

show abstract

“…However, the Russell-Brown model, which assumes a lower shear modulus and therefore dislocation line tension for the precipitates, has been successfully used to correlate yield stress changes in Fe-Cu alloys. 8) The interaction between an edge dislocation and a bcc Cu precipitate in bcc Fe has been investigated by a number of researchers using atomistic simulations in order to understand the strengthening and structural evolution of bcc Cu precipitates in bcc Fe. [9][10][11][12][13] Molecular dynamics (MD) simulations by Osetsky et al 11,12) showed that precipitate detachment by edge dislocations occurs mainly by shearing the precipitates (cutting mechanism), although the Orowan mechanism was observed for precipitates larger than 3 nm diameter.…”

Section: Introductionmentioning

confidence: 99%

“…They show that the CRSS for an edge dislocation increased roughly linearly with precipitate size and was significantly lower than predicted by the Russell-Brown modulus hardening model. 8) The screw dislocation interaction with a bcc Cu precipitate in bcc Fe has been investigated using molecular statics simulation, 14,15) but only recently have molecular dynamics simulations been performed, 16,17) in spite of the importance of screw dislocations in controlling the deformation behavior of bcc metals. 18,19) Compared to an edge dislocation, a screw dislocation in bcc metals has very complicated features such as the non-planar core structure and the twinning-antitwinning asymmetry deviated from the Schmid law.…”

Section: Introductionmentioning

confidence: 99%

Strengthening of Nanosized bcc Cu Precipitate in bcc Fe: A Molecular Dynamics Study

et al. 2009

View full text Add to dashboard Cite

The strengthening effect of nanosized Cu precipitates in bcc Fe has been studied by performing molecular dynamics simulations of the interaction between a screw dislocation and a coherent bcc Cu precipitate of 1-4 nm diameter in bcc Fe. The dislocation detachment mechanism changes from shear at a precipitate diameter of 4 and 2.5 nm in the twinning and anti-twinning directions, respectively, due to the coherency loss caused by the screw dislocation assisted martensitic transformation of the precipitate. The screw dislocation detachment mechanism with the larger, transformed precipitates involves annihilation-and-renucleation, or Orowan looping in the twinning vs. anti-twinning direction, respectively. The critical resolved shear stress (CRSS) of the screw dislocation-precipitate interaction increases with increasing precipitate size, and is strongly dependent on the precipitate structure and detachment mechanism. The CRSS is much larger in the anti-twinning direction.

show abstract

A dispersion strengthening model based on differing elastic moduli applied to the iron-copper system

Cited by 421 publications

References 3 publications

High-Strength Low-Carbon Ferritic Steel Containing Cu-Fe-Ni-Al-Mn Precipitates

High-Strength Low-Carbon Ferritic Steel Containing Cu-Fe-Ni-Al-Mn Precipitates

Model Calculation of the Damage Rate Dependence of Yield Stress Change in an Irradiated Fe-Cu Model Alloy

Strengthening of Nanosized bcc Cu Precipitate in bcc Fe: A Molecular Dynamics Study

Contact Info

Product

Resources

About