Age hardening studies in a Cu–4.5Ti–0.5Co alloy

Nagarjuna, S.; Sharma, Kapil K.; Sudhakar, I.; Sarma, D. S.

doi:10.1016/s0921-5093(00)01834-7

Cited by 58 publications

(32 citation statements)

References 10 publications

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“…On the other hand, it has been reported [6] that by increasing Ti content the electrical conductivity of copper matrix decreases dramatically, as the negative effect of Ti on electrical properties of copper alloys is more than that of other common alloying elements such as Zn, Sn, Ni. Therefore, in order to overcome this problem, some efforts have been made for modifying the precipitation behavior of CuTi alloys via addition of other elements such as Co and Cr [7,8] or by aging in D 2 and H 2 atmosphere [1,9].…”

Section: Introductionmentioning

confidence: 99%

Effects of in situ formation of TiB2 particles on age hardening behavior of Cu–1wt% Ti–1wt% TiB2

Sobhani

Mirhabibi

Arabi

et al. 2013

Materials Science and Engineering: A

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Age hardenable Cu-1wt. % Ti-1wt. % TiB 2 composite was produced by adding boron powder to CuTi melt. TiB 2 nano particles formed via in situ reaction in the melt. This composite was aged in the temperature range 300-550 ºC for 1-25 hrs. The age hardening behavior of composite then compared with that of binary Cu-2 wt. % Ti alloy. The microstructure of the composite was examined with highresolution transmission electron microscope (HRTEM). The results of this study showed that TiB 2 particles can act as heterogeneous nucleation site for '(Cu 4 Ti) precipitates. Substantial increase in tensile and yield stress of composite (i.e. 63% and 186%) occurred relative to the solution state, after ageing at 450 ºC for 10hrs. The maximum strength was associated with precipitation of metastable Cu 4 Ti near to the ultra hard TiB 2 particles within the matrix. However the mechanical properties of composite are comparable with Cu-2 wt. % Ti alloy , the maximum value of the hardness and electrical conductivity of composite (28 %IACS , 258 HV) and Cu-2 wt. % Ti (17% IACS , 264 HV) are obtained when solution treated samples were aged at 450 ºC for 10 hrs and 15hrs, respectively.

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Section: Introductionmentioning

confidence: 99%

Effects of in situ formation of TiB2 particles on age hardening behavior of Cu–1wt% Ti–1wt% TiB2

Sobhani

Mirhabibi

Arabi

et al. 2013

Materials Science and Engineering: A

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“…For many years, therefore, worldwide studies have been focused on discovering cheaper and non-toxic substitutes for Cu-Be alloys [1][2][3][4][5][6][7][8][9][10][11][12]14]. Currently, the best substitutes for beryllium bronzes seem to be binary Cu-Ti or multicomponent CuTi-X alloys that demonstrate mechanical properties and conductivity comparable to those of beryllium bronzes [15][16][17]. These alloys are suitable for precipitation hardening due to variable titanium solubility in solid copper [6,7,9,11,15,16,[18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Currently, the best substitutes for beryllium bronzes seem to be binary Cu-Ti or multicomponent CuTi-X alloys that demonstrate mechanical properties and conductivity comparable to those of beryllium bronzes [15][16][17]. These alloys are suitable for precipitation hardening due to variable titanium solubility in solid copper [6,7,9,11,15,16,[18][19][20]. It is estimated that over the next decade, these alloys, also called titanium bronzes or titanium copper, will effectively replace beryllium bronzes in most present applications.…”

Section: Introductionmentioning

confidence: 99%

“…The performance characteristics of titanium bronzes result from the titanium content, the size of matrix (coppertitanium solid solution) grain, overall deformation during cold working and morphologies of generated (during solution heat treatment and aging) dispersed precipitates of intermetallic phases [1][2][3][4][5][6][7][8][9][10][11][14][15][16][17][18][19][20][21][22][23]. The matrix grain size, created during the hot working processes, markedly determines properties of titanium bronze semi-finished and finished products, affecting the course and effect of cold working as well as subsequent solution heat treatment and aging [2,7,23,24].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure of Hot-Deformed Cu-3Ti Alloy

Szkliniarz¹,

Szkliniarz²,

Blacha³

et al. 2016

Archives of Metallurgy and Materials

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In the paper, results of investigations regarding temperature and strain rate effects on hot-deformed Cu-3Ti alloy microstructure are presented. Evaluation of the alloy microstructure was performed with the use of a Gleeble HDS-V40 thermal-mechanical simulator on samples subjected to uniaxial hot compression within 700 to 900ºC and at the strain rate of 0.1, 1.0 or 10.0 s -1 until 70% (1.2) strain. It was found that within the analyzed temperature and strain rate ranges, the alloy deformation led to partial or complete recrystallization of its structure and to multiple refinement of the initial grains. The recrystallization level and the average diameter of recrystallized grains increase with growing temperature and strain rate. It was shown that entirely recrystallized, fine-grained alloy structure could be obtained following deformation at the strain rate of min 10.0 s -1 and the temperature of 800°C or higher.

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“…La mayor parte de ellas fundamenta su resistencia en la formación de precipitados binarios y/o ternarios de extrema fineza, resistentes a ser cortados por las dislocaciones, confirién-dole al material un elevado límite de fluencia. Un buen ejemplo de este efecto son las aleaciones de CuCo-Si [1][2][3] , Cu-Co-Ti [4][5][6][7] , Cu-Al-Co [8] , Cu-Ni-Al [9][10][11] , etc. En el caso de las aleaciones Cu-Co-Ti, el proceso de precipitación ha sido estudiado por difracción de rayos X [12][13][14] , microscopía electrónica de transmisión (TEM) y energía dispersiva de rayos X (EDX) [4][5][6] .…”

Section: Introductionunclassified

Análisis cinético y estadístico de la precipitación en una aleación de Cu-0,49Co-0,44Ti, mediante microcalorimetría y medidas de microdureza

Donoso¹,

Díaz²

2009

Rev. metal.

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ResumenMediante calorimetría diferencial de barrido (DSC) se estudió la cinética de precipitación de átomos de cobalto y titanio a partir de una solución sólida de Cu-0,49Co-0,44Ti, templada desde 1.173 K. El análisis de las curvas calorimétricas muestran la presencia de una reacción exotérmica la cual se atribuye a la formación de partículas de CoTi en la matriz de cobre. La energía de activación de la reacción fue estimada a partir del método de Kissinger modificado. Los parámetros cinéticos fueron calculados mediante el formalismo de Johnson-Mehl-Avrami. Por otra parte, se efectuó un análisis estadístico del proceso de precipitación, mediante medidas de microdureza Vickers, empleando una función de distribución de probabilidad de Weibull. Se estimaron los parámetros de Weibull mediante el método de mínimos cuadrados. La bondad de ajuste se analizó considerando el test de chi-cuadrado con un nivel de confianza del 95 %. A medida que se incrementó el tiempo de envejecimiento, para igual temperatura de recocido, incrementó el valor del módulo de Weibull, lo cual puede atribuirse a la precipitación de la fase CoTi. Palabras claveCobre; Cu-Co-Ti; Precipitación; Microdureza; Estadística de Weibull. Kinetics and statistical analysis of precipitation in a Cu-0.49Co-0.44Ti alloy, by microcalorimetry and microhardness measurements AbstractStarting with a solid solution of Cu-0,49Co-0,44Ti tempered from 1173 K, the kinetics of precipitation of atoms of cobalt and titanium was studied by means of differential scanning calorimetry (DSC). The analysis of the calorimetric curves show the presence of an exothermal reaction that is attributed to the formation of particles of CoTi in the copper matrix. The energy of activation of the reaction was estimated by means of a modified method of Kissinger. The kinetic parameters were estimated with the use of the formalism of Johnson-Mehl-Avrami. On the other hand, a statistical analysis of the process of precipitation was performed by measuring the microhardness Vickers, employing a Weibull probability distribution function. Using minimum square method the Weibull parameters were estimated. The goodness of fit was analyzed by using the Chi square test with a condidence level of 95 percent. Increasing the aging time, for the sam annealing temperature, the Weibull modulus increase too, which may be attributed to precipitation of CoTi phase.

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Age hardening studies in a Cu–4.5Ti–0.5Co alloy

Cited by 58 publications

References 10 publications

Effects of in situ formation of TiB2 particles on age hardening behavior of Cu–1wt% Ti–1wt% TiB2

Effects of in situ formation of TiB2 particles on age hardening behavior of Cu–1wt% Ti–1wt% TiB2

Microstructure of Hot-Deformed Cu-3Ti Alloy

Análisis cinético y estadístico de la precipitación en una aleación de Cu-0,49Co-0,44Ti, mediante microcalorimetría y medidas de microdureza

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