Sensitivity of deformation twinning to grain size in titanium and magnesium

By A. Ghaderi, Matthew Barnett. 2011

373 citations recorded by the source corpus.

The impact of grain size on deformation twinning in commercial purity titanium and magnesium alloy Mg–3Al–1Zn (AZ31) is investigated. Tensile tests were carried out for the titanium samples; compression testing was employed for the magnesium specimens. Average values of the true twin length, true twin thickness and the number density of twins were determined using stereology. A key difference between these two materials is that twinning contributes little to the plastic strain in the titanium while it accounts for nearly all of the early plastic strain in the magnesium. In some respects (e.g. volume fraction and number density) the phenomenology of twinning differed between the two materials, while in others (e.g. twin shape and size) both materials showed a similar response. It is found that in both materials, twins span the entirety of their parent grains only for grain sizes less than ∼30 μm. Both the nucleation density per unit of nucleating interface (i.e. grain and twin boundaries) and the aspect ratio of twins scale with applied stress. The impact of grain size on twin volume fraction is modelled analytically.

Subfields: Biomaterials, Materials Chemistry, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/ef9e8518540624600d62e19185b94bd969a9e62c

How researchers see this paper

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In Biomaterials

1. C. Tomé
2. Jian Wang
3. Peidong Wu
4. Huamiao Wang
5. A. Wilkinson
6. T. Ben Britton
7. F. Dunne
8. Irene J. Beyerlein

In Materials Chemistry

1. T. Ben Britton
2. A. Wilkinson
3. F. Dunne
4. C. Tomé
5. Jian Wang
6. Peidong Wu
7. Huamiao Wang
8. Irene J. Beyerlein

In Mechanical Engineering

1. F. Dunne
2. T. Ben Britton
3. C. Tomé
4. A. Wilkinson
5. Peidong Wu
6. Jian Wang
7. Huamiao Wang
8. Irene J. Beyerlein

Citations in the corpus

• On the mechanistic basis of deformation at the microscale in hexagonal close-packed metals (2015, methodology): “Ghaderi and Barnett’s study [79] complements work of Beyerlein et al [87] who applied statistical approaches using EBSD to study twinning in Mg.”
• A crystal plasticity model for hexagonal close packed (HCP) crystals including twinning and de-twinning mechanisms (2013, background): “, have been investigated both experimentally and theoretically (Barrett and Haller, 1947; Bell and Cahn, 1957; Kelley and Hosford, 1968; Akhtar, 1973; Wang et al., 2010g,h; Abdolvand et al., 2011; Ghaderi and Barnett, 2011; Brown et al., 2012).”