TY  - JOUR
AU  - Jiang, Lu
AU  - Radmilović, Velimir R.
AU  - Sabisch, Julian E. C.
AU  - Qi, Liang
AU  - Minor, Andrew M.
AU  - Chrzan, Daryl C.
AU  - Asta, Mark
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4951
AB  - Twinning plays an important role in governing the balance between strength and ductility in hexagonal-close-packed (HCP) metals. Here, we report a combined experimental and theoretical study of twin nucleation from a single   lt c+a > dislocation in HCP crystals. Specifically, high-resolution transmission electron microscopy has been used to identify {11 (2) over bar1} twin nuclei in HCP rhenium, providing evidence of their nucleation from a   lt c+a > dislocation. The favorability of this dislocation-based nucleation mechanism is rationalized by an anisotropic elasticity model of   lt c+a > dislocation dissociation, parametrized by density functional theory calculations, which suggests the conditions for disconnection nucleation and propagation, under which this {11 (2) over bar1} twinning mechanism is expected to be effective. The analysis serves to advance our understanding of the origin of the unique predominance of {11 (2) over bar1} twinning in rhenium, which correlates with the high strength and ductility featured by this metal. It also provides new insights into design strategies that may be effective in activating this twinning mode and enhancing the balance between strength and ductility in HCP alloys more broadly.
T2  - Acta Materialia
T1  - Twin nucleation from a single   lt c plus a > dislocation in hexagonal close-packed crystals
EP  - 41
SP  - 35
VL  - 202
DO  - 10.1016/j.actamat.2020.10.038
ER  - 

@article{
author = "Jiang, Lu and Radmilović, Velimir R. and Sabisch, Julian E. C. and Qi, Liang and Minor, Andrew M. and Chrzan, Daryl C. and Asta, Mark",
year = "2021",
abstract = "Twinning plays an important role in governing the balance between strength and ductility in hexagonal-close-packed (HCP) metals. Here, we report a combined experimental and theoretical study of twin nucleation from a single   lt c+a > dislocation in HCP crystals. Specifically, high-resolution transmission electron microscopy has been used to identify {11 (2) over bar1} twin nuclei in HCP rhenium, providing evidence of their nucleation from a   lt c+a > dislocation. The favorability of this dislocation-based nucleation mechanism is rationalized by an anisotropic elasticity model of   lt c+a > dislocation dissociation, parametrized by density functional theory calculations, which suggests the conditions for disconnection nucleation and propagation, under which this {11 (2) over bar1} twinning mechanism is expected to be effective. The analysis serves to advance our understanding of the origin of the unique predominance of {11 (2) over bar1} twinning in rhenium, which correlates with the high strength and ductility featured by this metal. It also provides new insights into design strategies that may be effective in activating this twinning mode and enhancing the balance between strength and ductility in HCP alloys more broadly.",
journal = "Acta Materialia",
title = "Twin nucleation from a single   lt c plus a > dislocation in hexagonal close-packed crystals",
pages = "41-35",
volume = "202",
doi = "10.1016/j.actamat.2020.10.038"
}

Jiang, L., Radmilović, V. R., Sabisch, J. E. C., Qi, L., Minor, A. M., Chrzan, D. C.,& Asta, M.. (2021). Twin nucleation from a single   lt c plus a > dislocation in hexagonal close-packed crystals. in Acta Materialia, 202, 35-41.
https://doi.org/10.1016/j.actamat.2020.10.038

Jiang L, Radmilović VR, Sabisch JEC, Qi L, Minor AM, Chrzan DC, Asta M. Twin nucleation from a single   lt c plus a > dislocation in hexagonal close-packed crystals. in Acta Materialia. 2021;202:35-41.
doi:10.1016/j.actamat.2020.10.038 .

Jiang, Lu, Radmilović, Velimir R., Sabisch, Julian E. C., Qi, Liang, Minor, Andrew M., Chrzan, Daryl C., Asta, Mark, "Twin nucleation from a single   lt c plus a > dislocation in hexagonal close-packed crystals" in Acta Materialia, 202 (2021):35-41,
https://doi.org/10.1016/j.actamat.2020.10.038 . .

TY  - JOUR
AU  - Radmilović, Vuk
AU  - Kacher, Josh
AU  - Ivanović, Evica
AU  - Minor, Andrew M.
AU  - Radmilović, Velimir R.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3410
AB  - Detailed defect structure of dendrite formation was studied in order to connect the mesoscopic with the atomistic structure. It was demonstrated that twinning and stacking fault formation play a central role in the growth of electrodeposited Ag dendrites. The broad faces of Ag dendrites and the main trunk growth direction were found to be ((1) over bar 11) and [(1) over bar1 (2) over bar], respectively. Dendrite branches also formed and grew from the main trunk parallel to the [12 (1) over bar] and [(211) over bar] crystallographic directions. Twins and stacking faults were found to reside on the {111} crystallographic planes, as expected for a face centered cubic (FCC) Ag crystal. Using electron back scattered diffraction (EBSD) we found two variants of in-plane 60 degrees rotational twin domains in the ((1) over bar 11) broad dendrite surface plane. The intersections of twins and stacking faults with dendrite arm surfaces are perpendicular to the (112) arm growth directions. However, occasionally twins on the {111} planes parallel to the (112) arm growth directions were also observed. Although defect assisted dendrite growth is facilitated by twinning and stacking fault formation on {111} planes, the growth directions of the trunk and branches are not of the (111) type, but rather close to (112). The (112) growth directions are maintained by breaking dendrite facets into thermodynamically stable 111 and 200 steps and structural ledges of different length.
PB  - Amer Chemical Soc, Washington
T2  - Crystal Growth & Design
T1  - Multiple Twinning and Stacking Faults in Silver Dendrites
EP  - 474
IS  - 1
SP  - 467
VL  - 16
DO  - 10.1021/acs.cgd.5b01459
ER  - 

@article{
author = "Radmilović, Vuk and Kacher, Josh and Ivanović, Evica and Minor, Andrew M. and Radmilović, Velimir R.",
year = "2016",
abstract = "Detailed defect structure of dendrite formation was studied in order to connect the mesoscopic with the atomistic structure. It was demonstrated that twinning and stacking fault formation play a central role in the growth of electrodeposited Ag dendrites. The broad faces of Ag dendrites and the main trunk growth direction were found to be ((1) over bar 11) and [(1) over bar1 (2) over bar], respectively. Dendrite branches also formed and grew from the main trunk parallel to the [12 (1) over bar] and [(211) over bar] crystallographic directions. Twins and stacking faults were found to reside on the {111} crystallographic planes, as expected for a face centered cubic (FCC) Ag crystal. Using electron back scattered diffraction (EBSD) we found two variants of in-plane 60 degrees rotational twin domains in the ((1) over bar 11) broad dendrite surface plane. The intersections of twins and stacking faults with dendrite arm surfaces are perpendicular to the (112) arm growth directions. However, occasionally twins on the {111} planes parallel to the (112) arm growth directions were also observed. Although defect assisted dendrite growth is facilitated by twinning and stacking fault formation on {111} planes, the growth directions of the trunk and branches are not of the (111) type, but rather close to (112). The (112) growth directions are maintained by breaking dendrite facets into thermodynamically stable 111 and 200 steps and structural ledges of different length.",
publisher = "Amer Chemical Soc, Washington",
journal = "Crystal Growth & Design",
title = "Multiple Twinning and Stacking Faults in Silver Dendrites",
pages = "474-467",
number = "1",
volume = "16",
doi = "10.1021/acs.cgd.5b01459"
}

Radmilović, V., Kacher, J., Ivanović, E., Minor, A. M.,& Radmilović, V. R.. (2016). Multiple Twinning and Stacking Faults in Silver Dendrites. in Crystal Growth & Design
Amer Chemical Soc, Washington., 16(1), 467-474.
https://doi.org/10.1021/acs.cgd.5b01459

Radmilović V, Kacher J, Ivanović E, Minor AM, Radmilović VR. Multiple Twinning and Stacking Faults in Silver Dendrites. in Crystal Growth & Design. 2016;16(1):467-474.
doi:10.1021/acs.cgd.5b01459 .

Radmilović, Vuk, Kacher, Josh, Ivanović, Evica, Minor, Andrew M., Radmilović, Velimir R., "Multiple Twinning and Stacking Faults in Silver Dendrites" in Crystal Growth & Design, 16, no. 1 (2016):467-474,
https://doi.org/10.1021/acs.cgd.5b01459 . .