Between dislocation and disclination models for twins

Journal Article · Thu Dec 15 04:00:00 EST 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90459-6· OSTI ID:6891015

Muellner, P ^[1]; Romanov, A E ^[2]

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1. Swiss Federal Inst. of Technology, Zuerich (Switzerland). Inst. of Metallurgy
2. Ioffe Physico-Technical Inst., St. Petersburg (Russian Federation)

As result of a lot of theoretical and experimental work on the field of dislocation, the understanding of the plasticity of crystalline materials deforming by dislocation mechanisms is broad and many fold. However, many materials deform not only by the movement of ordinary perfect and dissociated dislocation (glide plasticity); other mechanisms such as the cooperative motion of partial dislocations involved in deformation twinning and strain induced martensite transformation contribute to deformation as well (transformational plasticity,). The understanding of glide plasticity is based on the properties of individual dislocations. The basis of transformational plasticity are cooperative ensembles of partial dislocations; the description of those ensembles in terms of individual dislocations is rather complex and therefore the transformational plasticity is by far not as well understood based on dislocation as glide plasticity is. However, special types of those ensembles form disclinations, the properties of which are given in a recent overview. It was 1968 when a twin was proposed for the first time to be described in terms of disclinations. Recently it was shown that under deformation conditions the front of a deformation twin in fact forms a disclination dipole. The present paper aims to review the elastic properties of a deformation twin in terms of disclinations, in order to give an elementary tool for the treatment of the many fold problems of twinning and strain induced martensite formation. In order to give an example of the overall applicability of the disclination model, a recrystallization twin is described also.

• OSTI ID: 6891015
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 31:12; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

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