Loss of coherency in spinodally decomposed CuNiFe alloys

Livak, R.J.; Thomas, G.

doi:10.1016/0001-6160(74)90156-4

Cited by 37 publications

(13 citation statements)

References 14 publications

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“…Dual phases consist of all alloying elements and no pure phase was detected, opposing to a previous report [85]. The present results are consistent with a large number of earlier studies [8][9][10][11][12][13][14][15][16][17][18][27][28][29][30][31][32][33][34][35][36][37][38][39][40][69][70][71][72][73][74][75][76][77]. In the current work, the particles clustered together and connected to form periodic arrays of rods extended in the h1 0 0i directions in both alloys as aging proceeded (Fig.…”

Section: Early Stages Of Ageingsupporting

confidence: 72%

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Improvements in spinodal alloys from past to present

Fındık

2012

Materials & Design

110

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Section: Early Stages Of Ageingsupporting

confidence: 72%

“…A large number of researchers investigated Cu-Ni-Fe [10][11]22,[32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47], Cu-Ni-Sn [9,10,28,[48][49][50][51][52][53][54][55][56][59][60][61][62][63], Cu-Ni-Cr [3][4][5][16][17][19][20][21]23,35,[64][65][66][67][68][69][...…”

Section: Spinodal Decomposition In Cu-based Alloysmentioning

confidence: 99%

Improvements in spinodal alloys from past to present

Fındık

2012

Materials & Design

110

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“…This is the preferred mechanism for spherical precipitates (Rastogi & Ardell, 1971) or where the interface is of such an extent that stress concentrations are not available, e.g. eutectic lamellae or rods (Cline et al, 1971;Nakagawa & Weatherly, 1972a, b), heterojunctions (Matthews, 1975; and spinodal structures (Livak & Thomas, 1974).…”

Section: Interfacesmentioning

confidence: 99%

“…Climb is not the only process by which dislocations with Burgers vector components normal to the interface can be eliminated. Livak & Thomas (1974) have observed products of spinodal decomposition in which the interface rotated to conform to the net direction of the Burgers vectors of the misfit dislocations, rather than the dislocations conforming to the interface. have observed this effect to operate at the edges of plates in A1-Au alloy, and there may well be many systems which show such behaviour.…”

Section: T H E S T a B I L I T Y O F S I M P 1 E I N T E R P H mentioning

confidence: 99%

The Structure Of Interphase Boundaries In Solids

Laird¹,

Sankaran²

1979

Journal of Microscopy

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SUMMARY Although, in principle, the structure of solid interphase interfaces should be no different from those of regular grain boundaries in homophase materials, it is shown that special boundaries characterized by a high degree of order occur much more frequently in interphase boundaries than in homophase boundaries. This is mainly caused by the fact that complex phases are usually produced at the end of the processing history of a material. Thus precipitates, eutectics, the products of spinodal decomposition, martensites, surface precipitates, epitaxially‐deposited heterojunctions and similar materials all tend to have special boundaries. On the other hand, multiphase materials subject to the same kinds of thermo‐mechanical processing as homophase materials, e.g. duplex steels, alloys with grain boundary precipitates, and superplastically deformed materials, possess interphase boundaries closely akin to those of homophase materials. The origins and structural details of the different kinds of boundaries are explored.

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“…The other plots illustrated substantial deviation from such a relationship, although all plots are consistent with a general increase in hardness with increasing lattice parameter difference. This suggests that the strength is not only dependent on the lattice parameter differences but also some other factors (such as the shear modulus and stacking fault energy of the two phases 340 [16,17]) affect the hardening. Also, since hardness reflects not only yield stress but also the workhardening rate, a clearer relationship might be obtained by plotting yield stress versus lattice parameter difference.…”

mentioning

confidence: 99%

Sidebands in spinodal Cu-Ni-Cr alloys and lattice parameters inquiries

Fındık

1993

J Mater Sci Lett

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Spinodal decomposition causes a modulation in the lattice spacing and lattice chemistry, and hence in the scattering factor. The intensity and position of the satellites about the Bragg peaks is influenced by these effects. Depending on the composition only, the modulation in the scattering factor provides a contribution to the satellite intensity. Nevertheless, the modulation in lattice spacing leads to contributions to the satellite intensity which depend on the amplitude and wavelength of the composition. Therefore, when both effects occur the satellites are complex diffuse phenomena [1]. Decomposition of supersaturated solid solutions within the spinodal region of the equilibrium diagram produces fluctuations in the elastically soft directions in the crystal. Sidebands are produced in spinodal alloys with contributions from both the scattering factor variation [2] and the lattice parameter variation [3,4]. In this study sidebands in spinodal Cu-Ni-Cr alloys and lattice parameters inquiries were investigated and compared with values from previous studies.In order to obtain all nominal compositions, pure copper (99.999%), nickel (99.9%) and chromium (99.9%) were melted in a vacuum arc-furnace. Chemical analysis of the alloys by X-ray energydispersive analysis showed the actual compositions to be (wt%): . After casting and checking the composition, the cast buttons were solution-treated and rapidly quenched as defined in [5,6].Heat treatments were carried out in a vertical tube furnace. The temperature within the hot zone of the furnace was controlled to an accuracy of +5 °C. Ageing times from 5 min to 3 weeks were employed and after the ageing all specimens were rapidly quenched into iced water. After the heat-treatments the specimens were examined by electron microscopy and X-ray diffraction as described in [5,6].In the early stages of ageing, the characteristics of spinodal decomposition observed in the X-ray diffraction and in the electron microscope were sidebands in the X-ray diffraction, a periodic structure in the electron micrographs and a constant wavelength (z).In order to carry out sideband analysis in X-ray diffraction, step-scans were made from 47 to 54 ° of 20. The scanning speed was 0.25 ° min -1 . This region of 20-space covered both the sidebands and the 2 0 0 Bragg peak. The 200 peak was used because it supplied the best combination of intensity and 338 sideband resolution. To obtain sidebands under these conditions, all alloys were scanned and sidebands were observed in all alloys. Sidebands were observed in the range 300-600 °C in the 2.5Cr and 5Cr asymmetrical alloys, and at 300-800 °C in the 10Cr and 15Cr symmetrical alloys (Fig. 1). However, sidebands were not very clear at 500-600 °C in the 5Cr alloy, at 800 °C in 10Cr and at 600 and 800 °C in 15Cr alloy. The reason for this might be due to no fitness of the combination of intensity and sideband resolution in the (200) peak for these alloys for particular temperatures. Similar sideband analyses were carried out by Rao et al. [7][8][9] fo...

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Loss of coherency in spinodally decomposed CuNiFe alloys

Cited by 37 publications

References 14 publications

Improvements in spinodal alloys from past to present

Improvements in spinodal alloys from past to present

The Structure Of Interphase Boundaries In Solids

Sidebands in spinodal Cu-Ni-Cr alloys and lattice parameters inquiries

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