Twinning in Hexagonal Close-Packed Materials: The Role of Phase Transformation

AH Zahiri, J Ombogo, M Lotfpour, L Cao - Metals, 2023 - mdpi.com
Twinning is a major mechanism of plastic deformation in hexagonal close-packed (hcp)
structures. However, a mechanistic understanding of twin nucleation and growth has yet to …

The role of mechanical loading in bcc-hcp phase transition: tension-compression asymmetry and twin formation

AH Zahiri, E Vitral, J Ombogo, M Lotfpour, L Cao - Acta Materialia, 2022 - Elsevier
In response to temperature or pressure changes, many body-centered cubic (bcc) materials
undergo martensitic bcc-hcp phase transformation, which is known to produce rich …

Exploring the basal/prismatic slip transfer at grain boundaries in magnesium: A molecular dynamic simulation

ST Oyinbo, S Singhaneka, R Matsumoto - Vacuum, 2023 - Elsevier
This study utilized the molecular dynamics method to investigate the slip transfer behaviors
of edge and screw dislocations in magnesium at basal/prismatic grain boundaries (BPGBs) …

On the formation of {112̄2} boundary via {101̄2}-{011̄2} twin–twin interaction in magnesium

AH Zahiri, L Carneiro, J Ombogo, P Chakraborty… - Computational Materials …, 2022 - Elsevier
Abstract {10 1 ̄ 2} twinning occurs extensively in Mg to accommodate plastic deformation.
With multiple active twin variants, twin–twin interaction occurs and this often forms twin–twin …

The anisotropy of deformation twinning in bcc materials: Mechanical loading, temperature effect, and twin–twin interaction

AH Zahiri, M Lotfpour, J Ombogo, E Vitral, L Cao - Acta Materialia, 2024 - Elsevier
By integrating atomistic simulations with theoretical calculations, we investigate the
prevalence of {112} deformation twins in bcc materials and their sensitivity to the loading …

Effect of a micro-scale dislocation pileup on the atomic-scale multi-variant phase transformation and twinning

Y Peng, R Ji, T Phan, L Capolungo, VI Levitas… - Computational Materials …, 2023 - Elsevier
In this paper, we perform concurrent atomistic–continuum (CAC) simulations to assess the
contribution of the internal stress induced by the microscale dislocation pileup at an …

Formation of {112¯ 2} contraction twins in titanium through reversible martensitic phase transformation

AH Zahiri, J Ombogo, L Cao - Scripta Materialia, 2021 - Elsevier
We report the discovery of a non-conventional {11 2¯ 2} twinning mechanism in α-titanium
through reversible α→ ω→ α martensitic phase transformations. Specifically, the parent α …

Transformation-induced plasticity in omega titanium

AH Zahiri, J Ombogo, T Ma, P Chakraborty… - Journal of Applied …, 2021 - pubs.aip.org
ω-titanium (Ti) is a high-pressure phase that is conventionally perceived to be brittle and
nondeformable, although direct investigations of its deformation process remain scarce. In …

[PDF][PDF] Twinning in Hexagonal Close-Packed Materials: The Role of Phase Transformation. Metals 2023, 13, 525

AH Zahiri, J Ombogo, M Lotfpour, L Cao - 2023 - leicao-research.github.io
Twinning is a major mechanism of plastic deformation in hexagonal close-packed (hcp)
structures. However, a mechanistic understanding of twin nucleation and growth has yet to …