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Nagarjuna, S.; Kandasubramanian, Balasubramanian; Sarma, D. S.

doi:10.1023/a:1018608430443

Cited by 57 publications

(28 citation statements)

References 8 publications

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“…This suggests that the cuboid particles correspond to the metastable 0 (Cu 4 Ti) phase. 5,6) The 0 phase has been reported 4) to be formed from a spinodal decomposition mechanism involving clustering and ordering. The stable phase was present in the lamellar structure, nucleated on grain boundaries due to the cellular precipitation, !…”

Section: Spinodal Decompositionmentioning

confidence: 99%

“…The precipitation process and strengthening in Cu-Ti alloys have been a subject of continuous studying. [1][2][3][4][5][6] The phase decomposition in the early stage of aging has been shown to take place via the mechanism of spinodal decomposition. 1) A sharp increase in hardness has been reported to occur after the continuous nucleation and growth of fine, coherent and metastable (Cu 4 Ti) 0 precipitates in aged Cu-Ti alloys.…”

Section: Introductionmentioning

confidence: 99%

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Precipitation Kinetics in a Cu-4 mass% Ti Alloy

et al. 2004

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The precipitation kinetics in a Cu-4 mass% Ti alloy was studied using SEM, TEM, XRD and Vickers hardness. A Cu-4 mass% Ti alloy was prepared, homogenized, solution treated and then aged at 673, 773 and 873 K for times between 0.6 to 720 ks. The XRD and TEM results indicated that the phase decomposition occurred by spinodal decomposition during the early stages of aging. The growth kinetics of composition modulation wavelength is very slow at the early stages of aging. The precipitation of metaestable 0 (Cu 4 Ti) preceded to that of the equilibrium phase phase (Cu 3 Ti), which formed through cellular precipitation. The coarsening process of 0 phase followed the LSW theory for diffusioncontrolled growth. The activation energy for this coarsening process was determined to be about 190 AE 10 kJÁmol À1 . The discontinuous precipitation of phase has an activation energy of about 207 kJÁmol À1 and an exponent time of about one. The highest hardness and fastest transformation kinetics occurred at aging temperatures of 673 and 873 K, respectively.

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Section: Spinodal Decompositionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Precipitation Kinetics in a Cu-4 mass% Ti Alloy

et al. 2004

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“…This is because the strain and lattice defects assist in nucleation of the precipitates, similar to that for aging in vacuum. 20,21) Thus, prior-deformation to a more severe extent causes more strain and a large number of lattice defects, which resulting in an increase of the number of nucleation sites and the nucleation rate for precipitates of Cu 4 Ti and TiH 2 .…”

Section: Influence Of Prior-deformationmentioning

confidence: 99%

Aging of Copper-Titanium Dilute Alloys in Hydrogen Atmosphere: Influence of Prior-Deformation on Strength and Electrical Conductivity

Semboshi

Orimo

Suda³

et al. 2011

Mater. Trans.

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The influence of prior-deformation on the mechanical and electrical properties of Cu-4.2 mol% Ti alloys aged in a hydrogen pressure of 0.8 MPa was examined. This follows from the results of aging solution-treated Cu-Ti alloys in a hydrogen atmosphere, which significantly improved their electrical conductivity over alloys conventionally aged in vacuum, without degradation of the mechanical strength. The maximum-strength was enhanced in the prior-deformed specimen, and the strengthening and increase in electrical conductivity were accelerated during aging in a hydrogen atmosphere, compared to that for the non-deformed specimen. As a result, the balance between the strength and the conductivity is improved within shorter aging time for specimens that are more severely deformed and then aged in a hydrogen atmosphere. The strengthening is mainly due to age-hardening by the growth of finely dispersed precipitates of Cu 4 Ti and TiH 2 , which are preferentially nucleated at lattice defects such as dislocations and nano-sized deformation twins. The improved conductivity is closely related to reduction of the solute Ti concentration in the copper matrix, which is attributed to the precipitation of TiH 2 and Cu 4 Ti. Thus, prior-deformation assists to render a good combination of strength and electrical conductivity for Cu-Ti dilute alloys during aging in a hydrogen atmosphere.

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“…This process is usually realised at temperatures of 400-700°C for 1 to 48 hours. It has been found that strengthening of the alloys occurs if the plastic working employed includes cold rolling before ageing [6][7][8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Service Properties of Copper Alloys

Polok-Rubiniec

Konieczny

Labisz

et al. 2016

Archives of Metallurgy and Materials

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This elaboration shows the effect of combined heat treatment and cold working on the structure and utility properties of alloyed copper. As the test material, alloyed copper CuTi4 was employed. The samples were subjected to treatment according to the following schema: 1 st variant -supersaturation and ageing, 2 nd variant -supersaturation, cold rolling and ageing. The paper presents the results of microstructure, hardness, and abrasion resistance. The analysis of the wipe profile geometry was realized using a Zeiss LSM 5 exciter confocal microscope. Cold working of the supersaturated solid solution affects significantly its hardness but the cold plastic deformation causes deterioration of the wear resistance of the finally aged CuTi4 alloy.

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Untitled

Cited by 57 publications

References 8 publications

Precipitation Kinetics in a Cu-4 mass% Ti Alloy

Precipitation Kinetics in a Cu-4 mass% Ti Alloy

Aging of Copper-Titanium Dilute Alloys in Hydrogen Atmosphere: Influence of Prior-Deformation on Strength and Electrical Conductivity

Microstructure and Service Properties of Copper Alloys

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