Precipitation in a Cu-0,55 wt.% Cr alloy

Weatherly, G. C.; Humble, P.; Borland, Douglas W.

doi:10.1016/0001-6160(79)90072-5

Cited by 120 publications

(38 citation statements)

References 21 publications

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“…These experiments raised some fundamental questions about the shape and the structure of the precipitates. In the 70's and later, nanoscaled Cr precipitates could be observed by Transmission Electron Microscopy (TEM) [5,7,[12][13][14], starting a long controversy on their crystallographic structure and orientation relationships (OR) with the fcc copper matrix. The equilibrium crystallographic structure of Cr is bcc, but in the early stage of precipitation it has been proposed by several authors that they could exhibit a metastable fcc structure [2,7,14].…”

Section: Introductionmentioning

confidence: 99%

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Atomic scale investigation of Cr precipitation in copper

2012

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The early stage of the chromium precipitation in copper was analyzed at the atomic scale by Atom Probe Tomography (APT). Quantitative data about the precipitate size, 3D shape, density, composition and volume fraction were obtained in a Cu-1Cr-0.1Zr (wt.%) commercial alloy aged at 713K. Surprisingly, nanoscaled precipitates exhibit various shapes (spherical, plates and ellipsoid) and contain a large amount of Cu (up to 50%), in contradiction with the equilibrium Cu-Cr phase diagram. APT data also show that some impurities (Fe) may segregate along Cu/Cr interfaces. The concomitant evolution of the precipitate shape and composition as a function of the aging time is discussed. A special emphasis is given on the competition between interfacial and elastic energy and on the role of Fe segregation.

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Section: Introductionmentioning

confidence: 99%

“…Some authors describe them as GP zones (i.e. few atomic planes) [16], others reporting about spherical [3], ellipsoid [15], plate [5,12], rod shaped precipitates [12,13] or even hexagonal [17]. But very recently, Hatakeyama and co-authors have used Atom Probe Tomography (APT) to analyze such precipitates [18,19].…”

Section: Introductionmentioning

confidence: 99%

Atomic scale investigation of Cr precipitation in copper

2012

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“…This kind of array has also been called "structural ledges" [19], and it is apparent from Fig. 10 that structural ledges differ from growth ledges o~ly by their regular spacing.…”

Section: General Invariant Plane Interfacesmentioning

confidence: 99%

Recent TEM studies of precipitate growth mechanisms

Westmacott

Dahmen

1986

Rev. Phys. Appl. (Paris)

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“…We also discuss the extent to which criteria such as 'best fit' are successful in predicting observed interface orientations. Particular emphasis is given to experimental results from the copper-chromium agehardening alloy system (Hall, Aaronson & Kinsman, 1972;Weatherly, Humble & Borland, 1979) for which the theory of Bollmann (1974) is appropriate when the chromium-rich b.c.c, precipitates have a NishiyamaWasserman (N-W) orientation relationship (Nishiyama, 1934) with the f.c.c, matrix. We start by discussing the formal theory of surface dislocations before analyzing the interface models of Bruce & Jaeger (1978), Hall et al (1972) and Rigsbee & Aaronson (1979a,b).…”

Section: Introductionmentioning

confidence: 99%

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The application of surface dislocation theory to the f.c.c.–b.c.c. interface

Knowles¹,

Smith²

1982

Acta Cryst A

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The formal theory of surface dislocations has been applied to the f.c.c.-b.c.c, interfaces defined by (111) F II (110)B. With the Bain correspondence between the two lattices, various theoretical models and experimental results on these interfaces have been analyzed. The results of the analysis suggest that preferred interface orientations can be explained on the basis that they are those of minimum or near-minimum Burgersvector contents. This concept leads to an improved criterion for comparing the elastic component of interfacial energies. The limitations of geometrical models for predicting low-energy interfaces are discussed. IntroductionIn this paper, we describe f.c.c.-b.c.c, boundaries in terms of the formal geometrical theory of surface dislocations (Bilby, Bullough & de Grinberg, 1964), of which the 0-lattice theory (Bollmann, 1970) may be considered to be a quantized version (Christian, 1976). We also discuss the extent to which criteria such as 'best fit' are successful in predicting observed interface orientations. Particular emphasis is given to experimental results from the copper-chromium agehardening alloy system (Hall, Aaronson & Kinsman, 1972;Weatherly, Humble & Borland, 1979) for which the theory of Bollmann (1974) c, interfaceThe Burgers vector content B of an interface between two phases designated by the subscripts + and -can be defined through the formulawhere p is a vector in the interface and S+ and 5_ are the deformations carrying the reference lattice, in which B and p are expressed in the final orientations of the (+) and (-) lattices respectively. If we choose the (+) lattice to be the reference lattice, which is transformed into the (-) lattice by the deformation $, the formula becomes B = (I--S-m) p. (2)If we suppose that the misfit in the interface defined by (2) i where vx~,and v is a unit vector normal to the boundary. The form of (2) demonstrates that if p is fixed in length and none of the three eigenvalues of S is equal to unity, then the locus of all points B defined through the equation is the surface of an ellipsoid. The principal axes of the ellipsoid can be determined by application of Lagrange multipliers to the function f(p)= ~ BiB ii

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Precipitation in a Cu-0,55 wt.% Cr alloy

Cited by 120 publications

References 21 publications

Atomic scale investigation of Cr precipitation in copper

Atomic scale investigation of Cr precipitation in copper

Recent TEM studies of precipitate growth mechanisms

The application of surface dislocation theory to the f.c.c.–b.c.c. interface

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