Grain size distribution and heat conductivity of copper processed by equal channel angular pressing

Gendelman, Oleg; Shapiro, M.; Estrin, Yuri; Hellmig, Ralph Jörg; Lekhtmakher, Shmuel

doi:10.1016/j.msea.2006.06.091

Cited by 33 publications

(22 citation statements)

References 16 publications

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“…A log-normal distribution appears to fit the cell size distribution data obtained from TEM analysis pretty well. However, a detailed analysis 6) showed that a different function accounts for the cell size distribution more adequately than a log-normal one.…”

Section: Resultsmentioning

confidence: 99%

“…7) can be introduced via the equation As l can be identified with the grain size, and bulk ¼ 400 W/mK and ¼ 39 nm at room temperature 13) are given, the only remaining variable influencing the thermal conductivity is the electron reflectivity. According to, 6) differences in r correspond to differences in the width of grain size distribution functions, as this influences the matching between boundaries of neighboring grains.…”

Section: Effect Of Ecap On Thermal Conductivitymentioning

confidence: 99%

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A Portrait of Copper Processed by Equal Channel Angular Pressing

Hellmig

Janeček

Hadzima³

et al. 2008

Mater. Trans.

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Copper is one of the most important materials used for electrical connectors with a high thermal and electricial conductivity, and there is an ongoing demand to improve its mechanical properties without sacrificing other beneficial properties. A possible approach to achieving this aim is to use the method of severe plastic deformation to obtain an ultrafine grained microstructure. Significant grain refinement obtained by equal channel angular pressing (ECAP) leads to an improvement of mechanical, microstructural and physical properties. This paper gives an overview of a range of the properties that can be achieved by ECAP processing of pure copper including microstructural features, thermal stability, thermal conductivity and corrosion resistance.

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Section: Resultsmentioning

confidence: 99%

Section: Effect Of Ecap On Thermal Conductivitymentioning

confidence: 99%

A Portrait of Copper Processed by Equal Channel Angular Pressing

Hellmig

Janeček

Hadzima³

et al. 2008

Mater. Trans.

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“…Specifically, we observe that the original grain size, (200 to 300) μm, becomes refined to be 600 nm (after 1 pass), 500 nm (after 2 passes), 400 nm (after 4 passes), and 300 nm (after 8 passes). Gendelmana [6] claimed that the small distribution of grain size increases the reflectance of electrons, which eventually decreases the thermal conductivity in ECAP-deformed ultrafine grained coppers. The result of this study with ECAPdeformed ultrafine grained aluminum 1060 agrees with this.…”

Section: Methodsmentioning

confidence: 99%

“…For metal materials, the strength increases with decreasing grain sizes. Use of ECAP has been studied for the grain refinement of metals, including steel, aluminum, and copper [2][3][4][5][6]. In particular, the grain refinement of aluminum alloys below submicron size has been difficult due to the low-temperature recovery with a high stacking fault energy, but ECAP application enables a significant improvement [1].…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Properties of Aluminum 1060 Fabricated by Equal Channel Angular Pressing

Lee

Kwon

Lee³

et al. 2012

Int J Thermophys

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Equal channel angular pressing (ECAP) has the advantage of enabling an ultrafine grain size. Aluminum 1060 is used as a power plant material because of its favorable electrical properties. However, the weak strength of aluminum limits its application. In this study, the thermal conductivity and electrical conductivity of Al 1060 made by ECAP was investigated. ECAP was conducted through the die having a channel angle of 90 • and a corner angle of 20 • at a temperature of 473 K with a strain rate of 2 mm · s −1 . The specimen was then processed with 1 to 8 passes by the route Bc method with 90 • rotation. In the case of eight passes, the grain size was reduced to as small as 300 nm. As a result of the ECAP, the tensile strength was raised from 75 MPa to 134 MPa, while the electrical conductivity did not show a significant difference after eight passes. The thermal conductivity gradually decreased with ECAP passes, because of the decreased grain size by ECAP.

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“…İnce taneli yapı elde etmek için yapılan çalışmalarda eş kanallı açısal presleme (ECAP) yönteminin kullanımı son on yılda oldukça arttığı görülmektedir. Bakır malzeme için yapılan bir araştırmada plastik deformasyon sırasında malzeme içinde artan dislokasyon yoğunluğu ile malzemenin ısı iletimi ve elektrik iletimi gibi fiziksel özelliklerinin kötüleştiği rapor edilmiştir [12].…”

Section: Tartışma Ve Sonuçunclassified

Alüminyum Alaşımlarında Bilyeli Dövmenin Elektrik İletkenliği Üzerine Etkisi

Alkan¹,

Varol²,

Selver³

2016

SDÜ Fen Bil Enst Der

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Özet: Bu çalışmada, bilyeli dövme işlemi uygulanmış bazı alüminyum alaşımlarının elektrik iletkenliği incelenmiştir. Metalik malzemelere uygulanan bir mekanik yüzey işlemi olan bilyeli dövme uygulanmış numunelerin elektrik iletkenliğinde değişiklik olup olmadığı deneysel olarak belirlenmeye çalışılmıştır. Bilyeli dövme işlemi özgül kütlesi düşük, korozyon direnci yüksek olan ve yaygın kullanım alanına sahip AA1050 ve AA2024 malzemelere uygulanmıştır. Bilyeli dövme işlemi uygulanacak numunelere dövme öncesi gerekli ısıl işlemler uygulanarak ısıl işlem uygulamasının etkisi de incelenmiştir. Bilyeli dövme işleminde kullanılan bilye çapları S230, S330 ve S460 olarak seçilmiştir. Bilyeli dövme işlemi hazırlanan levha şekilli numunelere tek taraflı ve iki (çift) taraflı olarak uygulanmıştır. Bilyeli dövme sonrası AA2024 malzemenin elektrik iletkenliği değerinde düşüşler belirlenmiştir. The Effect of Electrical Conductivity on Shot Peening in Aluminium AlloysKeywords Shot peening, Electrical conductivity, Al alloys Abstract: In this study, the electrical conductivity of shot peened some aluminium alloys was examined. The changing in electrical conductivity of as a mechanical surface treatment shot peened aluminium alloys. Shot peening was applied to widely used AA1050 and AA2024 aluminum alloys which have high corrosion resistance and low density. Before shot peeneing apropriate heat treatments were applied to the specimens. S230, S330 and S460 steel balls were selected as shot and used for shot peening process. Shot peening was applied as single-side and double side of prepared sheet shaped samples. Decreasing in electrical conductivity of shot peened AA2024 samples was determined.

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Grain size distribution and heat conductivity of copper processed by equal channel angular pressing

Cited by 33 publications

References 16 publications

A Portrait of Copper Processed by Equal Channel Angular Pressing

A Portrait of Copper Processed by Equal Channel Angular Pressing

Thermophysical Properties of Aluminum 1060 Fabricated by Equal Channel Angular Pressing

Alüminyum Alaşımlarında Bilyeli Dövmenin Elektrik İletkenliği Üzerine Etkisi

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