Improvement in strength and electrical conductivity of Cu–Ni–Si alloys by aging and cold rolling

Suzuki, Shigeru; Shibutani, Nanami; Mimura, Kouji; Isshiki, Minoru; Waseda, Yoshio

doi:10.1016/j.jallcom.2005.09.037

Cited by 196 publications

(87 citation statements)

References 13 publications

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“…12) Although both ST and STCR samples showed fundamentally similar property changes with a longer aging time, some differences were observed between them. After aging for 1000 s, the hardness of ST and STCR samples increased, while their resistivity decreased.…”

Section: Sample Preparationmentioning

confidence: 98%

“…However, because of the toxicity of beryllium, novel metallic materials free of hazardous substances are needed as an alternative to copper-beryllium alloys. For that reason, various copperbase alloys, such as copper-titanium (Cu-Ti) binary alloys [1][2][3][4][5] and copper-nickel-silicon (Cu-Ni-Si) alloys, [6][7][8][9][10][11][12] have been developed. They show excellent properties as a result of controlling the processing conditions.…”

Section: Introductionmentioning

confidence: 99%

“…For example, the aging characteristics of Cu-Ti alloys have been examined systematically, 5) and the effect of cold rolling before aging on the properties of Cu-Ni-Si alloys has been also investigated. 12) In order to control precipitates, it is essential to characterize their state accurately. Precipitates formed by aging have been studied using transmission electron microscopy, but it is difficult to evaluate systematic changes in the size of such precipitates because only local areas are observed.…”

Section: Introductionmentioning

confidence: 99%

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SAXS and XAFS Characterization of Precipitates in a High-Performance Cu–Ni–Si Alloy

Takahashi¹,

Sanada²,

Sato³

et al. 2007

Mater. Trans.

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Analyses of small-angle X-ray scattering (SAXS) and X-ray absorption fine structure (XAFS) were performed for characterizing precipitates formed in a Cu-3.1 at %Ni-1.4 at%Si alloy, the strength and electrical conductivity of which were improved by aging. SAXS profiles and XAFS spectra of samples aged at 720 K for different periods of time after a solution treatment were measured. SAXS profiles of samples, which were aged after the solution treatment and subsequently cold rolled, were also measured to investigate the effect of dislocations on precipitation. The results of SAXS measurements showed that nanometer-size precipitates formed in the alloy samples during isothermal aging at 720 K. The precipitates in the samples without cold rolling were coarsened in a single modal size distribution with increasing aging time. In contrast, the precipitates formed in the cold-rolled samples appeared to be coarsened in a multi-modal size distribution with increasing aging time. This aging characteristic of the cold-rolled samples is presumably attributable to their good electrical conductivity. The results of XAFS measurements at the Ni K-edge showed that nickel was substituted for copper in the face-centered cubic (fcc) copper matrix and that the local structure around nickel was changed by isothermal aging. With increasing aging time, extended X-ray absorption fine structure (EXAFS) functions at the Ni K-edge of the samples were found to be changed, which implies that nickel atoms were precipitated as nickel-silicon clusters or intermediate compounds in the fcc copper matrix. In addition, X-ray absorption near edge structure (XANES) spectra at the Ni K-edge indicated that the electronic structure of nickel in the samples was influenced by silicon during aging.

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Section: Sample Preparationmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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SAXS and XAFS Characterization of Precipitates in a High-Performance Cu–Ni–Si Alloy

Takahashi¹,

Sanada²,

Sato³

et al. 2007

Mater. Trans.

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“…Another effect brought by faster atom movement is of dislocations' movement was also accelerated. As a result, the density of dislocations and grain boundary decreased, so the conductive properties were accordingly improved (electrical resistivity is smaller, Figure 4) [11]. …”

Section: Influence Of T6 Aging Treatment On Microstructure and Propermentioning

confidence: 99%

Effects of Different Heat Treatment on Microstructure, Mechanical and Conductive Properties of Continuous Rheo-Extruded Al-0.9Si-0.6Mg (wt%) Alloy

Tie

Guan

Guo

et al. 2015

Metals

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Al-0.9Si-0.6Mg (wt%) alloy conductive wires were designed and produced by continuous rheo-extrusion process. The effects of different heat treatment on microstructure, mechanical and conductive properties of the wires were studied. Results show that, after T6 heat treatment, conductive property of the alloy increased while elongation decreased with the higher aging temperature and longer aging time. After T8 and T9 heat treatment, acicular strengthening phase β''-Mg2Si homogeneously precipitated, which effectively improved mechanical and conductive property of the alloy. The tensile strength, elongation and resistivity of T8 heat treated alloy reached 336 MPa, 13.7% and 29.3 nΩm respectively. After T9 heat treatment, the alloy's tensile strength, elongation and resistivity was 338 MPa, 6.0% and 30.2 nΩ·m respectively.

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“…Sin embargo, estos materiales no pueden ser utilizados para fines estructurales pues presentan una moderada resistencia mecánica (Apello y Fenici ,1988;Obrutsky et al, 1965;Saarivirta et al, 1960;Susuki et al, 2006) Actualmente se utilizan para tales aplicaciones aleaciones cobre-berilio, las cuales conjugan alta una resistencia mecánica (1400Mpa), conductividad eléctrica y térmica, mas una optima resistencia a la corrosión y al desgaste. Estas propiedades resultan en materiales aptos para aplicaciones electrónicas y eléctricas, matricería para plásticos entre otras aplicaciones.…”

Section: Introductionunclassified

Efectos del Tratamiento de Homogeneización en la Trabajabilidad de la Aleación CuNiSiCr

et al. 2010

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ResumenCon el objeto de mejorar la trabajabilidad de aleaciones CuNiSiCr se realizó un estudio de las condiciones del tratamiento térmico de homogeneizado y se evaluó su comportamiento mecánico a través de ensayos de tracción. Se realizaron ensayos de homogeneizados a 850, 950 y 1025ºC con tiempos de mantenimientos de 0, 1,5 y 6 horas y un posterior doble envejecido. Sobre ese material se realizaron ensayos de tracción a temperatura ambiente. Los resultados muestran una importante mejora en la trabajabilidad para temperaturas de 850ºC y tiempos de homogeneizados de 6 horas. Esta mejora en la ductilidad está asociada a la presencia de una microestructura conteniendo una escasa cantidad de precipitados discontinuos en límite de grano y precipitados redondeados en el interior de los granos. Se concluye que el tratamiento térmico de homogeneizado es una herramienta adecuada para aumentar la trabajabilidad de la aleación. Palabras clave: aleación CuNiSiCr, tratamiento térmico, homogeneización, crecimiento de grano, ductilidad Effects of Homogenization Treatment on the Workability of Alloy CuNiSiCr AbstractIn order to improve the workability of alloys CuNiSiCr a study of the conditions of homogenizing heat treatment and assessed their behavior through mechanical tests traction. Standardized tests were conducted at 850, 950 and 1025ºC with time-keeping 0, 1.5 and 6 hours and a subsequent double aged. It was observed that the optimum workability for the alloys occurs at the 850ºC and 6 hours. This improvement in ductility is associated with the presence of a microstructure containing a small amount of discontinuous precipitates in limiting grain and rounded precipitates inside the grains. It is concluded that the homogenizing heat treatment is and adequate method to increase the workability of the alloy.

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Improvement in strength and electrical conductivity of Cu–Ni–Si alloys by aging and cold rolling

Cited by 196 publications

References 13 publications

SAXS and XAFS Characterization of Precipitates in a High-Performance Cu–Ni–Si Alloy

SAXS and XAFS Characterization of Precipitates in a High-Performance Cu–Ni–Si Alloy

Effects of Different Heat Treatment on Microstructure, Mechanical and Conductive Properties of Continuous Rheo-Extruded Al-0.9Si-0.6Mg (wt%) Alloy

Efectos del Tratamiento de Homogeneización en la Trabajabilidad de la Aleación CuNiSiCr

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Improvement in strength and electrical conductivity of Cu–Ni–Si alloys by aging and cold rolling

Cited by 196 publications

References 13 publications

SAXS and XAFS Characterization of Precipitates in a High-Performance Cu&ndash;Ni&ndash;Si Alloy

SAXS and XAFS Characterization of Precipitates in a High-Performance Cu&ndash;Ni&ndash;Si Alloy

Effects of Different Heat Treatment on Microstructure, Mechanical and Conductive Properties of Continuous Rheo-Extruded Al-0.9Si-0.6Mg (wt%) Alloy

Efectos del Tratamiento de Homogeneización en la Trabajabilidad de la Aleación CuNiSiCr

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SAXS and XAFS Characterization of Precipitates in a High-Performance Cu–Ni–Si Alloy

SAXS and XAFS Characterization of Precipitates in a High-Performance Cu–Ni–Si Alloy