Publication
A new variational line tension model for accurate evaluation of the stress effect on cross-slip energy barrier in face-centered cubic metals
Related publications (32)
Strengthening mechanisms in dilute and random solid solution high-entropy BCC alloys
Tuning the mechanical properties of metals, including strength, through adjusting the type and/or concentration of added solute elements, has been recognized as an effective way to design and produce materials with desired or optimized mechanical propertie ...
EPFL2022Screw vs. edge dislocation strengthening in body-centered-cubic high entrophy alloys and implications for guided alloy design
William Curtin, Francesco Maresca, Carolina Baruffi
Body-centered-cubic (BCC) high entropy alloys (HEAs) can show exceptionally high strength up to high temperatures. Mechanistic theories are needed to guide alloy discovery within the immense multicomponent HEA compositional space. Here, two new theories fo ...
SPRINGER HEIDELBERG2022Theory of kink migration in dilute BCC alloys
William Curtin, Alireza Ghafarollahi
Plastic deformation in elemental BCC metals and dilute alloys is controlled by the slower of the kink pair nucleation and kink migration processes along screw dislocations. In alloys nucleation is facilitated and migration inhibited, leading to a concentra ...
2021Atomic Scale Investigations into the Origins of Ductility in Mg Alloys
The industrial applications of Mg, the lightest structural metal, and abundant in Earth's crust, are hampered by its low intrinsic ductility and low fracture toughness at room temperature which is attributed to the underlying less symmetric and plastically ...
EPFL2020Large scale 3-dimensional atomistic simulations of screw dislocations interacting with coherent twin boundaries in Al, Cu and Ni under uniaxial and multiaxial loading conditions
Helena Van Swygenhoven, Satish I Rao
Large scale 3D atomistic simulations are performed to study the interaction between a curved dislocation with a dominant screw character and a Coherent Twin Boundary (CTB). Three FCC metals (Al, Cu and Ni) are addressed using 6 embedded-atom method (EAM) p ...
PERGAMON-ELSEVIER SCIENCE LTD2019Solute/screw dislocation interaction energy parameter for strengthening in bcc dilute to high entropy alloys
William Curtin, Francesco Maresca, Alireza Ghafarollahi
Strengthening, i.e. increased stress required to move a dislocation, in dilute or complex alloys arises from the totality of the interaction energies between the solutes and an individual dislocation. Prevailing theories for strengthening in bcc alloys con ...
IOP PUBLISHING LTD2019Dislocation Cross-Slip in Face-Centered Cubic Solid Solution Alloys
The mechanical strength of metals depends on their resistance against various microscopic
deformation processes. In ductile metals, the most important process is shearing of the crystal
lattice by dislocations. One of the fundamental aspects of dislocation ...
EPFL2018Atomistic simulations of dislocation behavior in a model FCC multicomponent concentrated solid solution alloy
In this work, molecular statics and molecular dynamics simulations of a/2 < 110 > dislocation behavior for a model FCC Co30Fe16.67Ni36.67Ti16.67 alloy are discussed. It is shown that the single FCC phase is elastically stable in this alloy. Local stacking ...
Elsevier2017Atomistic mechanisms of hydrogen embrittlement
The detrimental effects of the H on the mechanical properties of the metals are known for more than a century. One of the most important degradation mechanisms is H embrittlement (HE). In this thesis, we examined a few famous proposed mechanisms in the fie ...
EPFL2017Atomistic simulations of dislocations in a model BCC multicomponent concentrated solid solution alloy
William Curtin, Céline Varvenne, Satish I Rao
Molecular statics and molecular dynamics simulations are presented for the structure and glide motion of a/2(111) dislocations in a randomly-distributed model-BCC Co16.67Fe36.67Ni16.67Ti30 alloy. Core structure variations along an individual dislocation li ...
Elsevier2017