A development of Kronberg's model for {1012} twins in H.C.P. metals. Extension to {1122} twins

Lann, A. Le; Dubertret, A.

doi:10.1002/pssa.2210510223

Cited by 18 publications

(9 citation statements)

References 26 publications

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“…Kronberg, Lann and Dubertret [83,84] propose synchroshear for (1012) twinning: here this is augmented by a specific TM mechanism. The correlation with step height is essentially a proof of the earlier proposal [83,84]. The component k vectors associated with synchroshear would be those shown in Figure 2(c).…”

Section: Relaxed Forward Tbs Stepsmentioning

confidence: 95%

“…Obviously, there would be a barrier to this dissociation, and it may not be likely. A more plausible mechanism is that the defect moves by synchroshear [82][83][84]. Kronberg, Lann and Dubertret [83,84] propose synchroshear for (1012) twinning: here this is augmented by a specific TM mechanism.…”

Section: Relaxed Forward Tbs Stepsmentioning

confidence: 99%

“…A more plausible mechanism is that the defect moves by synchroshear [82][83][84]. Kronberg, Lann and Dubertret [83,84] propose synchroshear for (1012) twinning: here this is augmented by a specific TM mechanism. The correlation with step height is essentially a proof of the earlier proposal [83,84].…”

Section: Relaxed Forward Tbs Stepsmentioning

confidence: 99%

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Interface structures and twinning mechanisms of twins in hexagonal metals

Gong

Hirth

Liu

et al. 2017

Materials Research Letters

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A controversy concerning the description of {1012} 1011 twinning, whether it is shear-shuffle or pure glide-shuffle or pure shuffle, has developed. There is disagreement about the interpretation of transmission electron microscopic observations, atomistic simulations and theories for twin growth. In this article, we highlight the atomic-level, characteristic, equilibrium and non-equilibrium boundaries and corresponding boundary defects associated with the threedimensional 'normal', 'forward' and 'lateral' propagation of {1012} growth/annealing and deformation twins. Although deformation twin boundaries (TBs) after recovery exhibit some similarity to growth/annealing TBs because of the plastic accommodation of stress fields, there are important distinctions among them. These distinctions distinguish among the mechanisms of twin growth and resolve the controversy. In addition, a new type of disconnection, a glide disclination, is described for twinning. Synchroshear, seldom considered, is shown to be a likely mechanism for {1012} twinning. IMPACT STATEMENTA controversy concerning {1012} 1011 twinning in hcp metals has developed. We present comprehensive understanding of interface structures and twinning mechanisms of {1012} growth/annealing and deformation twins at the atomic level. ARTICLE HISTORY

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Section: Relaxed Forward Tbs Stepsmentioning

confidence: 95%

Section: Relaxed Forward Tbs Stepsmentioning

confidence: 99%

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Interface structures and twinning mechanisms of twins in hexagonal metals

Gong

Hirth

Liu

et al. 2017

Materials Research Letters

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“…In 1980, Dubertret and Le Lann proposed models of twinning in hcp metals [152,153] that were cited by Wang et al [137] as references for the concept of shuffling. These models were nearly forgotten, despite or because of the huge amount of literature on deformation twinning.…”

Section: Comparison With Earlier Atomistic Models Of Hexagonal Close-mentioning

confidence: 99%

Shifting the Shear Paradigm in the Crystallographic Models of Displacive Transformations in Metals and Alloys

Cayron

2018

Crystals

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Deformation twinning and martensitic transformations are characterized by the collective displacements of atoms, an orientation relationship, and specific morphologies. The current crystallographic models are based on the 150-year-old concept of shear. Simple shear is a deformation mode at constant volume, relevant for deformation twinning. For martensitic transformations, a generalized version called invariant plane strain is used; it is associated with one or two simple shears in the phenomenological theory of martensitic crystallography. As simple shears would involve unrealistic stresses, dislocation/disconnection-mediated versions of the usual models have been developed over the last decades. However, a fundamental question remains unsolved: how do the atoms move? The aim of this paper is to return to a crystallographic approach introduced a few years ago; the approach is based on a hard-sphere assumption and linear algebra. The atomic trajectories, lattice distortion, and shuffling (if required) are expressed as analytical functions of a unique angular parameter; the habit planes are calculated with the simple "untilted plane" criterion; non-Schmid behaviors associated with some twinning modes are also predicted. Examples of steel and magnesium alloys are taken from recent publications. The possibilities offered in mechanics and thermodynamics are briefly discussed.

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“…a) I n a manner similar to that used previously for h.c.p. metals [29], we shall describe the transformation of a n initial volume formed by an atom and its surrounding first nearest and second nearest neighbours. I n a f.c.c.…”

Section: Preliminary Remarksmentioning

confidence: 99%

A structural description for the F.C.C. → B.C.C. martensitic transformation in terms of {011} 〈011〉f.c.c. simultaneous double shear. Relation with the atomic configuration in {3, 15, 10}f.c.c. habit plane

Lann

Dubertret

1983

Phys. Stat. Sol. (a)

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A Structural Description for the F.C.C. -+ B.C.C. Martensitic Transformation in Terms of (011) f.c.c. Simultaneous Double Shear BY Relation with the Atomic Configuration in (3, 15, 10}i.o.c. Habit Plano A. LE LANN and A. DUBERTRET The model proposed allo.cvs a correlation to be established between the main experimental results and the movement of atoms during the transformation. This movement is defined with respect t o the (Oll)f.c.c, -( i l l ) b.c.c. close-packed rows which are "strain invariant rows" of the transformation. The homogeneous and heterogeneous part of the deformation result from the same kind of atom movement which can be described by (011) (Oll)f.c.c. transverse waves. A simple atomic configuration is proposed for the { 225)fC.,. and { 3, 15, 10}f.c.c. habit plane. The habit plane structure is correlated to the Kurdjumov-Sachs or Nishiyama orientation relations and to the symmetry conditions during the transformation. Le modBle propose Btablit une correlation entre les principaux rBsultats expbrimentaux et le mouvement des atomes pendant la transformation. Ce mouvement cst dBfini par rapport mix rangees compactes (OII)f.c,c. + (ill)b.c.c. de la structure qui demeurent sans distorsion. I1 peut 6tre dbcrit par des ondes transversales (011) (Oll)f,c.c. et permet d 'obtenir simultanBment la deformation homoghe de reseau et la deformation dite B reseau invariant. La structure des plans d'accolement { 225}f., c . et { 3, 15, 10}f.c.c. est expliquee B partir d'une configuration atomique simple, egalement relike au mouvement des atomes. On montre le lien existant entre les conditions de symetrie pendant la transformation, les relations d'orientation de type Kurdjumov-Sachs ou Nishiyama et la nature { 225}f.c.c. ou { 3, 15, 10}f.c.c. du plan d'accolement.

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A development of Kronberg's model for {1012} twins in H.C.P. metals. Extension to {1122} twins

Cited by 18 publications

References 26 publications

Interface structures and twinning mechanisms of twins in hexagonal metals

Interface structures and twinning mechanisms of twins in hexagonal metals

Shifting the Shear Paradigm in the Crystallographic Models of Displacive Transformations in Metals and Alloys

A structural description for the F.C.C. → B.C.C. martensitic transformation in terms of {011} 〈011〉f.c.c. simultaneous double shear. Relation with the atomic configuration in {3, 15, 10}f.c.c. habit plane

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