Effects of Cold Work on Precipitation Hardening of Cu-4.5 mass%Ti Alloy

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

doi:10.2320/matertrans1989.36.1058

Cited by 68 publications

(45 citation statements)

References 14 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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“…Cu-Ti alloys are prone to have precipitation hardening after isothermal aging for alloy compositions of about 1-5wt.% Ti [1][2][3][4] . Age-hardenable Cu-Ti alloys have high tensile strength and good formability and they are used as connector materials in electronic and electrical components 5,6 ; nevertheless, its conductivity is less than the half of that corresponding to Cu-Be alloys.…”

Section: Introductionmentioning

confidence: 99%

Analysis of β´(Cu4Ti) Precipitation During Isothermal Aging of a Cu-4wt.%Ti Alloy

et al. 2018

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This work analyzed experimental and numerically the growth kinetics of β´precipitation of a Cu4wt.%Ti alloy after aging at 400, 500 and 600 °C for times from 0.0166 h to 200 h. Results indicated that the precipitation process is almost controlled by nucleation and growth during aging at 400 °C, originating a slow growth kinetics of precipitation. In contrast, the coarsening of precipitates dominates the precipitation process during aging at 500 and 600 °C. The interfacial energy of interface between the a matrix phase and β´ precipitates was determined to be about 0.1135, 0.0980 and 0.0725 Jm -2 for aging at 400, 500 and 600 °C, respectively. These values suggest a coherent interface which is in agreement with the flat faces of β´ cuboid precipitates. Calculated Time-Temperature-Precipitation diagram for the β´ precipitation indicated good agreement with experimental results. Precipitation hardening was higher for the slower growth kinetics of precipitation.

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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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Effects of Cold Work on Precipitation Hardening of Cu-4.5 mass%Ti Alloy

Cited by 68 publications

References 14 publications

Precipitation Kinetics in a Cu-4 mass% Ti Alloy

Precipitation Kinetics in a Cu-4 mass% Ti Alloy

Analysis of β´(Cu4Ti) Precipitation During Isothermal Aging of a Cu-4wt.%Ti Alloy

Microstructure and Service Properties of Copper Alloys

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