Structural evolutions of metallic materials processed by severe plastic deformation

Y Cao, S Ni, X Liao, M Song, Y Zhu - Materials Science and Engineering: R …, 2018 - Elsevier
Abstract Bulk nanostructured (ns)/ultrafine-grained (UFG) metallic materials possess very
high strength, making them attractive for high strength, lightweight and energy efficient …

Deformation twinning in nanocrystalline materials

YT Zhu, XZ Liao, XL Wu - Progress in Materials Science, 2012 - Elsevier
Nanocrystalline (nc) materials can be defined as solids with grain sizes in the range of 1–
100 nm. Contrary to coarse-grained metals, which become more difficult to twin with …

Why are {101¯ 2} twins profuse in magnesium?

H El Kadiri, CD Barrett, J Wang, CN Tomé - Acta Materialia, 2015 - Elsevier
Abstract We show that {10 1¯ 2} twinning in magnesium acts as an effective sink of basal
dislocations without loss of mobility. The lattice dislocation decomposes into the b 0/0 BP …

Disconnections and other defects associated with twin interfaces

JP Hirth, J Wang, CN Tomé - Progress in Materials Science, 2016 - Elsevier
The general topological model for interfacial defects is reviewed and expanded, and the role
of these defects in the coupled shear-migration of interfaces is explored. We focus on …

Effect of local stress fields on twin characteristics in HCP metals

MA Kumar, IJ Beyerlein, CN Tomé - Acta Materialia, 2016 - Elsevier
We study the effect of nearest neighboring grains on the propensity for {1012} twin growth in
Mg and Zr. Twin lamellae lying within one grain flanked by two neighboring grains with …

Twinning and de-twinning via glide and climb of twinning dislocations along serrated coherent twin boundaries in hexagonal-close-packed metals

J Wang, L Liu, CN Tomé, SX Mao… - Materials Research …, 2013 - Taylor & Francis
The (1¯ 012) twin boundaries experimentally observed in hexagonal-close-packed metals
are often serrated rather than fully coherent. These serrated coherent twin boundaries …

Dislocation induced twin growth and formation of basal stacking faults in {101 2} twins in pure Mg

F Wang, CD Barrett, RJ McCabe, H El Kadiri… - Acta Materialia, 2019 - Elsevier
In situ tension experiments were performed on oriented pure Mg single crystal specimens,
within a transmission electron microscope. Several microstructure evolutions directly related …

The roles of grain boundary dislocations and disclinations in the nucleation of {1 0 1 2} twinning

CD Barrett, H El Kadiri - Acta materialia, 2014 - Elsevier
Consider a magnesium bicrystal created from two single crystal lattices referred to as black
and white. The bicrystal abuts a basal plane of the black crystal with a first-order prismatic …

Remelt processing and microstructure of selective laser melted Ti25Ta

EG Brodie, AE Medvedev, JE Frith… - Journal of Alloys and …, 2020 - Elsevier
In this study, elemental powder mixtures of Ti25Ta, an alloy with promise for orthopaedic
applications, were processed using Selective Laser Melting (SLM), an emerging …

Interface structures and twinning mechanisms of twins in hexagonal metals

M Gong, JP Hirth, Y Liu, Y Shen… - Materials Research …, 2017 - Taylor & Francis
ABSTRACT A controversy concerning the description of twinning, whether it is shear-shuffle
or pure glide-shuffle or pure shuffle, has developed. There is disagreement about the …