The structure of nearly coherent fcc: bcc boundaries in a CuCr alloy

Hall, Matthew; Aaronson, H.I.; Kinsma, K.R.

doi:10.1016/0039-6028(72)90264-6

Cited by 332 publications

(80 citation statements)

References 12 publications

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“…Since a bct (body-centered tetragonal)-bcc (body-centered cubic) transformation was proposed as a possible path of the fcc (face-centered cubic)-bcc martensitic transformation by Bain and Dunkiri in 1924, 1) such Bain deformation paths have been widely studied [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] from both experimental and theoretical approaches. For example, transmission electron micrograph images provide much information such as the preferential orientation relationship (OR) 3) and the atomic arrangement 4) at the austenite-martensite interface of iron-based alloys.…”

Section: Introductionmentioning

confidence: 99%

Orientation Relationship in Fcc–Bcc Phase Transformation Kinetics of Iron: a Molecular Dynamics Study

2010

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The kinetics of the (110) bcc //(111) fcc heterointerface of iron during the fcc-bcc phase transformation has been investigated by molecular dynamics simulation. The various orientation relationships (ORs) between Nishiyama-Wasserman (N-W) and Kurdjumow-Sachs (K-S) ORs, which are experimentally observed, were examined. The planar propagation of the fcc-bcc heterointerface was observed in the case of the N-W and near N-W ORs, whereas a fast needlelike growth after initial planar growth was observed in the case of the K-S and near K-S ORs. The transformation started from the matching area of the fcc and bcc lattice and followed the Bain transformation path. It was confirmed that the difference in the matching area of the fcc and bcc lattices at the interface between the N-W and K-S ORs causes the two different propagation behaviors. In addition, the distribution of the atomic stress in the system during phase transformation was examined. The residual atomic stress was distributed toward the [010] bcc direction after the transformation in the case of the N-W OR. The change in the direction of the Bain deformation path during phase transformation caused a fast needlelike growth after the initial planar propagation in the case of the K-S OR.

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Section: Introductionmentioning

confidence: 99%

Orientation Relationship in Fcc–Bcc Phase Transformation Kinetics of Iron: a Molecular Dynamics Study

2010

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“…Singularity based on matching patterns Inspecting a pattern of the distribution of lattice matching is a very effective way to understand faceted interfaces, as demonstrated by the structural ledge model 22,23 and the nearcoincidence sites (NCSs) model. 24 Let two lattices related by an arbitrary OR interpenetrate each other, as in the construction of an O-lattice or a coincidence site lattice (CSL).…”

Section: Integrated Frameworkmentioning

confidence: 99%

“…To begin with, let us adopt first the good matching criterion suggested in the structural ledge model. 22,23 In this model, with a minor modification to generalise the criterion, a good matching site (GMS) is identified as a lattice point in the lattice with the larger unit cell (the larger lattice) when the distance from this point to a neighbouring lattice point in the other lattice is o15%|b s | (where b s is a Burgers vector of the lattice with the smaller unit cell). The GMS ratio (the number of GMSs with respect to the number of lattice points in the larger lattice) in a selected interface region is then used to evaluate the degree of matching in the interface.…”

Section: Integrated Frameworkmentioning

confidence: 99%

“…They determined the HP according to two vectors in the interface plane: an approximate IL and another vector of small misfit. The structural ledge model proposed by Aaronson and his colleagues, 22,23 and the NCS model developed by Liang and Reynolds 24 are also in this group. According to the structural ledge model, an irrational HP containing structural ledges is preferred, as it exhibits a higher overall GMS fraction than the interface parallel to atomic flat planes in both phases.…”

Section: Links Between Modelsmentioning

confidence: 99%

“…According to the structural ledge model, an irrational HP containing structural ledges is preferred, as it exhibits a higher overall GMS fraction than the interface parallel to atomic flat planes in both phases. 22,23 According to the NCS model, 24 a HP should lie along the greatest area passing an array of continuous NCSs (i.e., GMSs). All three models above were applied to interpreting HPs in an fcc/bcc system with the K-S OR.…”

Section: Links Between Modelsmentioning

confidence: 99%

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Faceted interfaces: a key feature to quantitative understanding of transformation morphology

Zhang

Dai

2016

npj Comput Mater

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Faceted interfaces are a typical key feature of the morphology of many microstructures generated from solid-state phase transformations. Interpretation, prediction and simulation of this faceted morphology remain a challenge, especially for systems where irrational orientation relationships (ORs) between two phases and irrational interface orientations (IOs) are preferred. In terms of structural singularities, this work suggests an integrated framework, which possibly encompasses all candidates of faceted interfaces. The structural singularities are identified from a matching pattern, a dislocation structure and/or a ledge structure. The resultant singular interfaces have discrete IOs, described with low-index g's (rational orientations) and/or Δg's (either rational or irrational orientations). Various existing models are grouped according to their determined results regarding the OR and IO, and the links between the models are clarified in the integrated framework. Elimination of defect types as far as possible in a dominant singular interface often exerts a central restriction on the OR. An irrational IO is usually due to the elimination of dislocations in one direction, i.e., an O-line interface. Analytical methods using both three-dimensional and two-dimensional models for quantitative determinations of O-line interfaces are reviewed, and a detailed example showing the calculation for an irrational interface is given. The association between structural singularities and local energy minima is verified by atomistic calculations of interfacial energies in fcc/bcc alloys where it is found that the calculated equilibrium cross-sections are in a good agreement with observations from selected alloys.

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Surface Relief Effects as Evidence for Coherency of Interphase Boundaries

Aaronson

2002

Science and Technology of Interfaces

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The structure of nearly coherent fcc: bcc boundaries in a CuCr alloy

Cited by 332 publications

References 12 publications

Orientation Relationship in Fcc–Bcc Phase Transformation Kinetics of Iron: a Molecular Dynamics Study

Orientation Relationship in Fcc–Bcc Phase Transformation Kinetics of Iron: a Molecular Dynamics Study

Faceted interfaces: a key feature to quantitative understanding of transformation morphology

Surface Relief Effects as Evidence for Coherency of Interphase Boundaries

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